Author: "S. LeBohec" - Searchworks@Jio Institute Digital Library Search Results

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1. Model-based Cross-correlation Search for Gravitational Waves from the Low-mass X-Ray Binary Scorpius X-1 in LIGO O3 Data

Author: Abbott, R, Abe, H, Acernese, F, Ackley, K, Adhicary, S, Adhikari, N, Adhikari, R, Adkins, V, Adya, V, Affeldt, C, Agarwal, D, Agathos, M, Aguiar, O, Aiello, L, Ain, A, Ajith, P, Akutsu, T, Albanesi, S, Alfaidi, R, Alléné, C, Allocca, A, Altin, P, Amato, A, Anand, S, Ananyeva, A, Anderson, S, Anderson, W, Ando, M, Andrade, T, Andres, N, Andrés-Carcasona, M, Andrić, T, Ansoldi, S, Antelis, J, Antier, S, Apostolatos, T, Appavuravther, E, Appert, S, Apple, S, Arai, K, Araya, A, Araya, M, Areeda, J, Arène, M, Aritomi, N, Arnaud, N, Arogeti, M, Aronson, S, Asada, H, Ashton, G, Aso, Y, Assiduo, M, Assis de Souza Melo, S, Aston, S, Astone, P, Aubin, F, Aultoneal, K, Babak, S, Badaracco, F, Badger, C, Bae, S, Bae, Y, Bagnasco, S, Bai, Y, Baier, J, Baird, J, Bajpai, R, Baka, T, Ball, M, Ballardin, G, Ballmer, S, Baltus, G, Banagiri, S, Banerjee, B, Bankar, D, Barayoga, J, Barish, B, Barker, D, Barneo, P, Barone, F, Barr, B, Barsotti, L, Barsuglia, M, Barta, D, Bartlett, J, Barton, M, Bartos, I, Basak, S, Bassiri, R, Basti, A, Bawaj, M, Bayley, J, Bazzan, M, Bécsy, B, Bedakihale, V, Beirnaert, F, Bejger, M, Belahcene, I, Bell, A, Benedetto, V, Beniwal, D, Benoit, W, Bentley, J, Benyaala, M, Bera, S, Berbel, M, Bergamin, F, Berger, B, Bernuzzi, S, Beroiz, M, Bersanetti, D, Bertolini, A, Betzwieser, J, Beveridge, D, Bhandare, R, Bhandari, A, Bhardwaj, U, Bhatt, R, Bhattacharjee, D, Bhaumik, S, Bianchi, A, Bilenko, I, Bilicki, M, Billingsley, G, Bini, S, Birnholtz, O, Biscans, S, Bischi, M, Biscoveanu, S, Bisht, A, Biswas, B, Bitossi, M, Bizouard, M, Blackburn, J, Blair, C, Blair, D, Blair, R, Bobba, F, Bode, N, Boër, M, Bogaert, G, Boldrini, M, Bolingbroke, G, Bonavena, L, Bondarescu, R, Bondu, F, Bonilla, E, Bonnand, R, Booker, P, Bork, R, Boschi, V, Bose, N, Bose, S, Bossilkov, V, Boudart, V, Bouffanais, Y, Bozzi, A, Bradaschia, C, Brady, P, Bramley, A, Branch, A, Branchesi, M, Brau, J, Breschi, M, Briant, T, Briggs, J, Brillet, A, Brinkmann, M, Brockill, P, Brooks, A, Brooks, J, Brown, D, Brunett, S, Bruno, G, Bruntz, R, Bryant, J, Bucci, F, Buchanan, J, Bulik, T, Bulten, H, Buonanno, A, Burtnyk, K, Buscicchio, R, Buskulic, D, Buy, C, Byer, R, Cabourn Davies, G, Cabras, G, Cabrita, R, Cadonati, L, Cagnoli, G, Cahillane, C, Calderón Bustillo, J, Callaghan, J, Callister, T, Calloni, E, Camp, J, Canepa, M, Caneva, G, Cannavacciuolo, M, Cannon, K, Cao, H, Cao, Z, Capistran, L, Capocasa, E, Capote, E, Carapella, G, Carbognani, F, Carlassara, M, Carlin, J, Carpinelli, M, Carrillo, G, Carter, J, Carullo, G, Casanueva Diaz, J, Casentini, C, Castaldi, G, Caudill, S, Cavaglià, M, Cavalier, F, Cavalieri, R, Cella, G, Cerdá-Durán, P, Cesarini, E, Chaibi, W, Chakalis, W, Chalathadka Subrahmanya, S, Champion, E, Chan, C, Chan, K, Chan, M, Chandra, K, Chang, I, Chang, W, Chanial, P, Chao, S, Chapman-Bird, C, Charlton, P, Chassande-Mottin, E, Chatterjee, C, Chatterjee, D, Chaturvedi, M, Chaty, S, Chen, C, Chen, D, Chen, H, Chen, J, Chen, K, Chen, X, Chen, Y, Cheng, H, Chessa, P, Cheung, H, Chia, H, Chiadini, F, Chiang, C, Chiarini, G, Chierici, R, Chincarini, A, Chiofalo, M, Chiummo, A, Choudhary, R, Choudhary, S, Christensen, N, Chu, Q, Chu, Y, Chua, S, Chung, K, Ciani, G, Ciecielag, P, Cieślar, M, Cifaldi, M, Ciobanu, A, Ciolfi, R, Clara, F, Clark, J, Clarke, T, Clearwater, P, Clesse, S, Cleva, F, Coccia, E, Codazzo, E, Cohadon, P, Cohen, D, Colleoni, M, Collette, C, Colombo, A, Colpi, M, Compton, C, Conti, L, Cooper, S, Corban, P, Corbitt, T, Cordero-Carrión, I, Corezzi, S, Cornish, N, Corsi, A, Cortese, S, Coschizza, A, Cotesta, R, Cottingham, R, Coughlin, M, Coulon, J, Countryman, S, Cousins, B, Couvares, P, Coward, D, Cowart, M, Coyne, D, Coyne, R, Craig, K, Creighton, J, Creighton, T, Criswell, A, Croquette, M, Crowder, S, Cudell, J, Cullen, T, Cumming, A, Cummings, R, Cuoco, E, Curyło, M, Dabadie, P, Dal Canton, T, Dall'Osso, S, Dálya, G, Dana, A, D'Angelo, B, Danilishin, S, D'Antonio, S, Danzmann, K, Darsow-Fromm, C, Dasgupta, A, Datrier, L, Datta, S, Dattilo, V, Dave, I, Davier, M, Davis, D, Davis, M, Daw, E, Dax, M, Debra, D, Deenadayalan, M, Degallaix, J, De Laurentis, M, Deléglise, S, Del Favero, V, De Lillo, F, De Lillo, N, Dell'Aquila, D, Del Pozzo, W, De Matteis, F, D'Emilio, V, Demos, N, Dent, T, Depasse, A, De Pietri, R, De Rosa, R, De Rossi, C, Desalvo, R, De Simone, R, Dhurandhar, S, Diab, R, Díaz, M, Didio, N, Dietrich, T, Di Fiore, L, Di Fronzo, C, Di Giorgio, C, Di Giovanni, F, Di Giovanni, M, Di Girolamo, T, Diksha, D, Di Lieto, A, Di Michele, A, Di Pace, S, Di Palma, I, Di Renzo, F, Divakarla, A, Dmitriev, A, Doctor, Z, Doleva, P, Donahue, L, D'Onofrio, L, Donovan, F, Dooley, K, Dooney, T, Doravari, S, Dorosh, O, Drago, M, Driggers, J, Drori, Y, Ducoin, J, Dunn, L, Dupletsa, U, Durante, O, D'Urso, D, Duverne, P, Dwyer, S, Eassa, C, Easter, P, Ebersold, M, Eckhardt, T, Eddolls, G, Edelman, B, Edo, T, Edy, O, Effler, A, Eguchi, S, Eichholz, J, Eikenberry, S, Eisenmann, M, Eisenstein, R, Ejlli, A, Engelby, E, Enomoto, Y, Errico, L, Essick, R, Estellés, H, Estevez, D, Etzel, T, Evans, M, Evans, T, Evstafyeva, T, Ewing, B, Fabrizi, F, Faedi, F, Fafone, V, Fair, H, Fairhurst, S, Fan, P, Farah, A, Farr, B, Farr, W, Favaro, G, Favata, M, Fays, M, Fazio, M, Feicht, J, Fejer, M, Fenyvesi, E, Ferguson, D, Fernandez-Galiana, A, Ferrante, I, Ferreira, T, Fidecaro, F, Figura, P, Fiori, A, Fiori, I, Fishbach, M, Fisher, R, Fittipaldi, R, Fiumara, V, Flaminio, R, Floden, E, Fong, H, Font, J, Fornal, B, Forsyth, P, Franke, A, Frasca, S, Frasconi, F, Freed, J, Frei, Z, Freise, A, Freitas, O, Frey, R, Fritschel, P, Frolov, V, Fronzé, G, Fujii, Y, Fujikawa, Y, Fujimoto, Y, Fulda, P, Fyffe, M, Gabbard, H, Gabella, W, Gadre, B, Gair, J, Gais, J, Galaudage, S, Gamba, R, Ganapathy, D, Ganguly, A, Gao, D, Gaonkar, S, Garaventa, B, García-Núñez, C, García-Quirós, C, Gardner, K, Gargiulo, J, Garufi, F, Gasbarra, C, Gateley, B, Gayathri, V, Ge, G, Gemme, G, Gennai, A, George, J, Gerberding, O, Gergely, L, Ghonge, S, Ghosh, A, Ghosh, S, Ghosh, T, Giacoppo, L, Giaime, J, Giardina, K, Gibson, D, Gier, C, Giri, P, Gissi, F, Gkaitatzis, S, Glanzer, J, Gleckl, A, Godoy, F, Godwin, P, Goetz, E, Goetz, R, Golomb, J, Goncharov, B, González, G, Gosselin, M, Gouaty, R, Gould, D, Goyal, S, Grace, B, Grado, A, Graham, V, Granata, M, Granata, V, Gras, S, Grassia, P, Gray, C, Gray, R, Greco, G, Green, A, Green, R, Gretarsson, A, Gretarsson, E, Griffith, D, Griffiths, W, Griggs, H, Grignani, G, Grimaldi, A, Grimm, S, Grote, H, Grunewald, S, Gruson, A, Guerra, D, Guidi, G, Guimaraes, A, Gulati, H, Gulminelli, F, Gunny, A, Guo, H, Guo, Y, Gupta, A, Gupta, P, Gupta, S, Gurs, J, Gustafson, R, Gutierrez, N, Guzman, F, Ha, S, Hadiputrawan, I, Haegel, L, Haino, S, Halim, O, Hall, E, Hamilton, E, Hammond, G, Han, W, Haney, M, Hanks, J, Hanna, C, Hannam, M, Hannuksela, O, Hansen, H, Hanson, J, Harada, R, Harder, T, Haris, K, Harms, J, Harry, G, Harry, I, Hartwig, D, Hasegawa, K, Haskell, B, Haster, C, Hathaway, J, Hattori, K, Haughian, K, Hayakawa, H, Hayama, K, Hayes, F, Healy, J, Heidmann, A, Heidt, A, Heintze, M, Heinze, J, Heinzel, J, Heitmann, H, Hellman, F, Hello, P, Helmling-Cornell, A, Hemming, G, Hendry, M, Heng, I, Hennes, E, Hennig, J, Hennig, M, Henshaw, C, Hernandez, A, Hernandez Vivanco, F, Heurs, M, Hewitt, A, Higginbotham, S, Hild, S, Hill, P, Himemoto, Y, Hines, A, Hirata, N, Hirose, C, Ho, T, Hochheim, S, Hofman, D, Hohmann, J, Holcomb, D, Holland, N, Hollows, I, Holmes, Z, Holt, K, Holz, D, Hong, Q, Hough, J, Hourihane, S, Howell, D, Howell, E, Hoy, C, Hoyland, D, Hreibi, A, Hsieh, B, Hsieh, H, Hsiung, C, Huang, H, Huang, P, Huang, Y, Hübner, M, Huddart, A, Hughey, B, Hui, D, Hui, V, Husa, S, Huttner, S, Huxford, R, Huynh-Dinh, T, Hyland, J, Iandolo, G, Ide, S, Idzkowski, B, Iess, A, Inayoshi, K, Inoue, Y, Iosif, P, Irwin, J, Gupta, I, Isi, M, Ito, K, Itoh, Y, Iyer, B, Jaberianhamedan, V, Jacqmin, T, Jacquet, P, Jadhav, S, Jain, T, James, A, Jan, A, Jani, K, Janquart, J, Janssens, K, Janthalur, N, Jaranowski, P, Jariwala, D, Jarov, S, Jaume, R, Jenkins, A, Jenner, K, Jeon, C, Jia, W, Jiang, J, Jin, H, Johns, G, Johnston, R, Johny, N, Jones, A, Jones, D, Jones, P, Jones, R, Joshi, P, Ju, L, Jung, K, Jung, P, Junker, J, Juste, V, Kaihotsu, K, Kajita, T, Kakizaki, M, Kalaghatgi, C, Kalogera, V, Kamai, B, Kamiizumi, M, Kanda, N, Kandhasamy, S, Kang, G, Kanner, J, Kao, Y, Kapadia, S, Kapasi, D, Karat, S, Karathanasis, C, Karki, S, Kashyap, R, Kasprzack, M, Kastaun, W, Kato, T, Katsanevas, S, Katsavounidis, E, Katzman, W, Kaur, T, Kawabe, K, Kawaguchi, K, Kéfélian, F, Keitel, D, Key, J, Khadka, S, Khalili, F, Khan, S, Khanam, T, Khazanov, E, Khetan, N, Khursheed, M, Kijbunchoo, N, Kim, C, Kim, J, Kim, K, Kim, P, Kim, W, Kim, Y, Kimball, C, Kimura, N, King, B, Kinley-Hanlon, M, Kirchhoff, R, Kissel, J, Klimenko, S, Klinger, T, Knee, A, Knust, N, Kobayashi, Y, Koch, P, Koehlenbeck, S, Koekoek, G, Kohri, K, Kokeyama, K, Koley, S, Kolitsidou, P, Kolstein, M, Kondrashov, V, Kong, A, Kontos, A, Korobko, M, Kossak, R, Kovalam, M, Koyama, N, Kozak, D, Kozakai, C, Kranzhoff, L, Kringel, V, Krishnendu, N, Królak, A, Kuehn, G, Kuijer, P, Kulkarni, S, Kumar, A, Kumar, P, Kumar, R, Kume, J, Kuns, K, Kuromiya, Y, Kuroyanagi, S, Kuwahara, S, Kwak, K, Lacaille, G, Lagabbe, P, Laghi, D, Lalande, E, Lalleman, M, Lamberts, A, Landry, M, Lane, B, Lang, R, Lange, J, Lantz, B, La Rosa, I, Lartaux-Vollard, A, Lasky, P, Lawrence, J, Laxen, M, Lazzarini, A, Lazzaro, C, Leaci, P, Leavey, S, Lebohec, S, Lecoeuche, Y, Lee, E, Lee, H, Lee, K, Lee, R, Legred, I, Lehmann, J, Lemaître, A, Lenti, M, Leonardi, M, Leonova, E, Leroy, N, Letendre, N, Levesque, C, Levin, Y, Leviton, J, Leyde, K, Li, A, Li, B, Li, K, Li, P, Li, T, Li, X, Lin, C, Lin, E, Lin, F, Lin, H, Lin, L, Linde, F, Linker, S, Littenberg, T, Liu, G, Liu, J, Liu, X, Llamas, F, Lo, R, Lo, T, London, L, Longo, A, Lopez, D, Lopez Portilla, M, Lorenzini, M, Loriette, V, Lormand, M, Losurdo, G, Lott, T, Lough, J, Lousto, C, Lovelace, G, Lowry, M, Lucaccioni, J, Lück, H, Lumaca, D, Lundgren, A, Lung, Y, Luo, L, Lussier, A, Lynam, J, Ma'Arif, M, Macas, R, Macinnis, M, Macleod, D, Macmillan, I, Macquet, A, Magaña Hernandez, I, Magazzù, C, Magee, R, Maggiore, R, Magnozzi, M, Mahesh, S, Majorana, E, Makarem, C, Maksimovic, I, Maliakal, S, Malik, A, Man, N, Mandic, V, Mangano, V, Mannix, B, Mansell, G, Mansingh, G, Manske, M, Mantovani, M, Mapelli, M, Marchesoni, F, Marín Pina, D, Marion, F, Mark, Z, Márka, S, Márka, Z, Markakis, C, Markosyan, A, Markowitz, A, Maros, E, Marquina, A, Marsat, S, Martelli, F, Martin, I, Martin, R, Martinez, M, Martinez, V, Martinovic, K, Martynov, D, Marx, E, Masalehdan, H, Mason, K, Masserot, A, Masso-Reid, M, Mastrogiovanni, S, Matas, A, Mateu-Lucena, M, Matiushechkina, M, Mavalvala, N, Mccann, J, Mccarthy, R, Mcclelland, D, Mcclincy, P, Mccormick, S, Mcculler, L, Mcghee, G, Mcginn, J, Mcguire, S, Mcisaac, C, Mciver, J, Mcleod, A, Mcrae, T, Mcwilliams, S, Meacher, D, Mehmet, M, Mehta, A, Meijer, Q, Melatos, A, Mendell, G, Menendez-Vazquez, A, Menoni, C, Mercer, R, Mereni, L, Merfeld, K, Merilh, E, Merritt, J, Merzougui, M, Messenger, C, Messick, C, Meyers, P, Meylahn, F, Mhaske, A, Miani, A, Miao, H, Michaloliakos, I, Michel, C, Michimura, Y, Middleton, H, Mihaylov, D, Miller, A, Miller, B, Millhouse, M, Mills, J, Milotti, E, Minenkov, Y, Mio, N, Mir, L, Miravet-Tenés, M, Mishkin, A, Mishra, C, Mishra, T, Mistry, T, Mitchell, A, Mitra, S, Mitrofanov, V, Mitselmakher, G, Mittleman, R, Miyakawa, O, Miyo, K, Miyoki, S, Mo, G, Modafferi, L, Moguel, E, Mogushi, K, Mohapatra, S, Mohite, S, Molina-Ruiz, M, Mondal, C, Mondin, M, Montani, M, Moore, C, Moragues, J, Moraru, D, Morawski, F, More, A, More, S, Moreno, C, Moreno, G, Mori, Y, Morisaki, S, Morisue, N, Moriwaki, Y, Mours, B, Mow-Lowry, C, Mozzon, S, Muciaccia, F, Mukherjee, D, Mukherjee, S, Mukund, N, Mullavey, A, Munch, J, Muñiz, E, Murray, P, Muusse, S, Nadji, S, Nagano, K, Nagar, A, Nagar, T, Nakamura, K, Nakano, H, Nakano, M, Nakayama, Y, Napolano, V, Nardecchia, I, Narikawa, T, Narola, H, Naticchioni, L, Nayak, R, Neil, B, Neilson, J, Nelson, A, Nelson, T, Nery, M, Neubauer, P, Neunzert, A, Ng, K, Ng, S, Nguyen, C, Nguyen, P, Nguyen, T, Nguyen Quynh, L, Ni, J, Ni, W, Nichols, S, Nieradka, G, Nishimoto, T, Nishizawa, A, Nissanke, S, Nitoglia, E, Niu, W, Nocera, F, Norman, M, North, C, Notte, J, Novak, J, Nozaki, S, Nurbek, G, Nuttall, L, Obayashi, Y, Oberling, J, O'Brien, B, O'Dell, J, Oelker, E, Oertel, M, Ogaki, W, Oganesyan, G, Oh, J, Oh, K, Oh, S, O'Hanlon, T, Ohashi, M, Ohashi, T, Ohkawa, M, Ohme, F, Ohta, H, Okutani, Y, Oliveri, R, Olivetto, C, Oohara, K, Oram, R, O'Reilly, B, Ormiston, R, Ormsby, N, Orselli, M, O'Shaughnessy, R, O'Shea, E, Oshino, S, Ossokine, S, Osthelder, C, Otabe, S, Ottaway, D, Overmier, H, Pace, A, Pagano, G, Pagano, R, Pagliaroli, G, Pai, A, Pai, S, Pal, S, Palamos, J, Palashov, O, Palomba, C, Pan, K, Panda, P, Pang, P, Pannarale, F, Pant, B, Panther, F, Paoletti, F, Paoli, A, Paolone, A, Pappas, G, Parisi, A, Park, J, Parker, W, Pascucci, D, Pasqualetti, A, Passaquieti, R, Passuello, D, Patel, M, Patel, N, Pathak, M, Patricelli, B, Patron, A, Paul, S, Payne, E, Pedraza, M, Pedurand, R, Pegna, R, Pegoraro, M, Pele, A, Peña Arellano, F, Penano, S, Penn, S, Perego, A, Pereira, A, Pereira, T, Perez, C, Périgois, C, Perkins, C, Perreca, A, Perriès, S, Perry, J, Pesios, D, Petermann, J, Pfeiffer, H, Pham, H, Pham, K, Phukon, K, Phurailatpam, H, Piccinni, O, Pichot, M, Piendibene, M, Piergiovanni, F, Pierini, L, Pierra, G, Pierro, V, Pillant, G, Pillas, M, Pilo, F, Pinard, L, Pineda-Bosque, C, Pinto, I, Pinto, M, Piotrzkowski, B, Piotrzkowski, K, Pirello, M, Pitkin, M, Placidi, A, Placidi, E, Planas, M, Plastino, W, Poggiani, R, Polini, E, Pong, D, Ponrathnam, S, Porter, E, Posnansky, C, Poulton, R, Powell, J, Pracchia, M, Pradier, T, Prajapati, A, Prasai, K, Prasanna, R, Pratten, G, Principe, M, Prodi, G, Prokhorov, L, Prosposito, P, Prudenzi, L, Puecher, A, Punturo, M, Puosi, F, Puppo, P, Pürrer, M, Qi, H, Quartey, N, Quetschke, V, Quinonez, P, Quitzow-James, R, Raab, F, Raaijmakers, G, Radkins, H, Radulesco, N, Raffai, P, Rail, S, Raja, S, Rajan, C, Ramirez, K, Ramirez, T, Ramos-Buades, A, Rana, D, Rana, J, Rangnekar, P, Rapagnani, P, Ray, A, Raymond, V, Raza, N, Razzano, M, Read, J, Regimbau, T, Rei, L, Reid, S, Reinhard, M, Reitze, D, Relton, P, Renzini, A, Rettegno, P, Revenu, B, Reyes, J, Reza, A, Rezac, M, Rezaei, A, Ricci, F, Richards, D, Richardson, J, Richardson, L, Riles, K, Rinaldi, S, Robertson, C, Robertson, N, Robie, R, Robinet, F, Rocchi, A, Rodriguez, S, Rolland, L, Rollins, J, Romanelli, M, Romano, R, Romel, C, Romero, A, Romero-Shaw, I, Romie, J, Ronchini, S, Roocke, T, Rosa, L, Rose, C, Rosińska, D, Ross, M, Rossello, M, Rowan, S, Rowlinson, S, Roy, S, Royzman, A, Rozza, D, Ruggi, P, Ruiz-Rocha, K, Ryan, K, Sachdev, S, Sadecki, T, Sadiq, J, Saffarieh, P, Saha, S, Saito, Y, Sakai, K, Sakellariadou, M, Sakon, S, Salafia, O, Salces-Carcoba, F, Salconi, L, Saleem, M, Salemi, F, Sallé, M, Samajdar, A, Sanchez, E, Sanchez, J, Sanchez, L, Sanchis-Gual, N, Sanders, J, Sanuy, A, Saravanan, T, Sarin, N, Sasli, A, Sassolas, B, Satari, H, Sathyaprakash, B, Sauter, O, Savage, R, Savant, V, Sawada, T, Sawant, H, Sayah, S, Schaetzl, D, Scheel, M, Scheuer, J, Schiworski, M, Schmidt, P, Schmidt, S, Schnabel, R, Schneewind, M, Schofield, R, Schönbeck, A, Schulte, B, Schutz, B, Schwartz, E, Scott, J, Scott, S, Seglar-Arroyo, M, Sekiguchi, Y, Sellers, D, Sengupta, A, Sentenac, D, Seo, E, Sequino, V, Sergeev, A, Servignat, G, Setyawati, Y, Shaffer, T, Shahriar, M, Shaikh, M, Shams, B, Shao, L, Sharma, A, Sharma, P, Shawhan, P, Shcheblanov, N, Sheela, A, Sheridan, E, Shikano, Y, Shikauchi, M, Shimizu, H, Shimode, K, Shinkai, H, Shishido, T, Shoda, A, Shoemaker, D, Shyamsundar, S, Sieniawska, M, Sigg, D, Silenzi, L, Singer, L, Singh, D, Singh, M, Singh, N, Singha, A, Sintes, A, Sipala, V, Skliris, V, Slagmolen, B, Slaven-Blair, T, Smetana, J, Smith, J, Smith, L, Smith, R, Soldateschi, J, Somala, S, Somiya, K, Song, I, Soni, K, Soni, S, Sordini, V, Sorrentino, F, Sorrentino, N, Soulard, R, Souradeep, T, Spagnuolo, V, Spencer, A, Spera, M, Spinicelli, P, Srivastava, A, Srivastava, V, Stachie, C, Stachurski, F, Steer, D, Steinlechner, J, Steinlechner, S, Stergioulas, N, Stops, D, Strain, K, Strang, L, Stratta, G, Strong, M, Strunk, A, Sturani, R, Stuver, A, Suchenek, M, Sudhagar, S, Sugimoto, R, Suh, H, Sullivan, A, Summerscales, T, Sun, L, Sunil, S, Sur, A, Suresh, J, Sutton, P, Suzuki, T, Swinkels, B, Syx, A, Szczepańczyk, M, Szewczyk, P, Tacca, M, Tagoshi, H, Tait, S, Takahashi, H, Takahashi, R, Takano, S, Takeda, H, Takeda, M, Talbot, C, Tamanini, N, Tanaka, K, Tanaka, T, Tanasijczuk, A, Tanioka, S, Tanner, D, Tao, D, Tao, L, Tapia, R, Tapia San Martín, E, Taranto, C, Taruya, A, 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Moreno, Y. Mori, S. Morisaki, N. Morisue, Y. Moriwaki, B. Mours, C. M. Mow-Lowry, S. Mozzon, F. Muciaccia, D. Mukherjee, Soma Mukherjee, Subroto Mukherjee, Suvodip Mukherjee, N. Mukund, A. Mullavey, J. Munch, E. A. Muñiz, P. G. Murray, S. Muusse, S. L. Nadji, K. Nagano, A. Nagar, T. Nagar, K. Nakamura, H. Nakano, M. Nakano, Y. Nakayama, V. Napolano, I. Nardecchia, T. Narikawa, H. Narola, L. Naticchioni, R. K. Nayak, B. F. Neil, J. Neilson, A. Nelson, T. J. N. Nelson, M. Nery, P. Neubauer, A. Neunzert, K. Y. Ng, S. W. S. Ng, C. Nguyen, P. Nguyen, T. Nguyen, L. Nguyen Quynh, J. Ni, W. -T. Ni, S. A. Nichols, G. Nieradka, T. Nishimoto, A. Nishizawa, S. Nissanke, E. Nitoglia, W. Niu, F. Nocera, M. Norman, C. North, J. Notte, J. Novak, S. Nozaki, G. Nurbek, L. K. Nuttall, Y. Obayashi, J. Oberling, B. D. O'Brien, J. O'Dell, E. Oelker, M. Oertel, W. Ogaki, G. Oganesyan, J. J. Oh, K. Oh, S. H. Oh, T. O'Hanlon, M. Ohashi, T. Ohashi, M. Ohkawa, F. Ohme, H. Ohta, Y. Okutani, R. Oliveri, C. Olivetto, K. Oohara, R. Oram, B. O'Reilly, R. G. Ormiston, N. D. Ormsby, M. Orselli, R. O'Shaughnessy, E. O'Shea, S. Oshino, S. Ossokine, C. Osthelder, S. Otabe, D. J. Ottaway, H. Overmier, A. E. Pace, G. Pagano, R. Pagano, G. Pagliaroli, A. Pai, S. A. Pai, S. Pal, J. R. Palamos, O. Palashov, C. Palomba, K. -C. Pan, P. K. Panda, P. T. H. Pang, F. Pannarale, B. C. Pant, F. H. Panther, F. Paoletti, A. Paoli, A. Paolone, G. Pappas, A. Parisi, J. Park, W. Parker, D. Pascucci, A. Pasqualetti, R. Passaquieti, D. Passuello, M. Patel, N. R. Patel, M. Pathak, B. Patricelli, A. S. Patron, S. Paul, E. Payne, M. Pedraza, R. Pedurand, R. Pegna, M. Pegoraro, A. Pele, F. E. Peña Arellano, S. Penano, S. Penn, A. Perego, A. Pereira, T. Pereira, C. J. Perez, C. Périgois, C. C. Perkins, A. Perreca, S. Perriès, J. W. Perry, D. Pesios, J. Petermann, H. P. Pfeiffer, H. Pham, K. A. Pham, K. S. Phukon, H. Phurailatpam, O. J. Piccinni, M. Pichot, M. Piendibene, F. Piergiovanni, L. Pierini, G. Pierra, V. Pierro, G. Pillant, M. Pillas, F. Pilo, L. Pinard, C. Pineda-Bosque, I. M. Pinto, M. Pinto, B. J. Piotrzkowski, K. Piotrzkowski, M. Pirello, M. D. Pitkin, A. Placidi, E. Placidi, M. L. Planas, W. Plastino, R. Poggiani, E. Polini, D. Y. T. Pong, S. Ponrathnam, E. K. Porter, C. Posnansky, R. Poulton, J. Powell, M. Pracchia, T. Pradier, A. K. Prajapati, K. Prasai, R. Prasanna, G. Pratten, M. Principe, G. A. Prodi, L. Prokhorov, P. Prosposito, L. Prudenzi, A. Puecher, M. Punturo, F. Puosi, P. Puppo, M. Pürrer, H. Qi, N. Quartey, V. Quetschke, P. J. Quinonez, R. Quitzow-James, F. J. Raab, G. Raaijmakers, H. Radkins, N. Radulesco, P. Raffai, S. X. Rail, S. Raja, C. Rajan, K. E. Ramirez, T. D. Ramirez, A. Ramos-Buades, D. Rana, J. Rana, P. R. Rangnekar, P. Rapagnani, A. Ray, V. Raymond, N. Raza, M. Razzano, J. Read, T. Regimbau, L. Rei, S. Reid, S. W. Reid, M. Reinhard, D. H. Reitze, P. Relton, A. Renzini, P. Rettegno, B. Revenu, J. Reyes, A. Reza, M. Rezac, A. S. Rezaei, F. Ricci, D. Richards, J. W. Richardson, L. Richardson, K. Riles, S. Rinaldi, C. Robertson, N. A. Robertson, R. Robie, F. Robinet, A. Rocchi, S. Rodriguez, L. Rolland, J. G. Rollins, M. Romanelli, R. Romano, C. L. Romel, A. Romero, I. M. Romero-Shaw, J. H. Romie, S. Ronchini, T. J. Roocke, L. Rosa, C. A. Rose, D. Rosińska, M. P. Ross, M. Rossello, S. Rowan, S. J. Rowlinson, Santosh Roy, Soumen Roy, A. Royzman, D. Rozza, P. Ruggi, K. Ruiz-Rocha, K. Ryan, S. Sachdev, T. Sadecki, J. Sadiq, P. Saffarieh, S. Saha, Y. Saito, K. Sakai, M. Sakellariadou, S. Sakon, O. S. Salafia, F. Salces-Carcoba, L. Salconi, M. Saleem, F. Salemi, M. Sallé, A. Samajdar, E. J. Sanchez, J. H. Sanchez, L. E. Sanchez, N. Sanchis-Gual, J. R. Sanders, A. Sanuy, T. R. Saravanan, N. Sarin, A. Sasli, B. Sassolas, H. Satari, B. S. Sathyaprakash, O. Sauter, R. L. Savage, V. Savant, T. Sawada, H. L. Sawant, S. Sayah, D. Schaetzl, M. Scheel, J. Scheuer, M. G. Schiworski, P. Schmidt, S. Schmidt, R. Schnabel, M. Schneewind, R. M. S. Schofield, A. Schönbeck, B. W. Schulte, B. F. Schutz, E. Schwartz, J. Scott, S. M. Scott, M. Seglar-Arroyo, Y. Sekiguchi, D. Sellers, A. S. Sengupta, D. Sentenac, E. G. Seo, V. Sequino, A. Sergeev, G. Servignat, Y. Setyawati, T. Shaffer, M. S. Shahriar, M. A. Shaikh, B. Shams, L. Shao, A. Sharma, P. Sharma, P. Shawhan, N. S. Shcheblanov, A. Sheela, E. Sheridan, Y. Shikano, M. Shikauchi, H. Shimizu, K. Shimode, H. Shinkai, T. Shishido, A. Shoda, D. H. Shoemaker, D. M. Shoemaker, S. ShyamSundar, M. Sieniawska, D. Sigg, L. Silenzi, L. P. Singer, D. Singh, M. K. Singh, N. Singh, A. Singha, A. M. Sintes, V. Sipala, V. Skliris, B. J. J. Slagmolen, T. J. Slaven-Blair, J. Smetana, J. R. Smith, L. Smith, R. J. E. Smith, J. Soldateschi, S. N. Somala, K. Somiya, I. Song, K. Soni, S. Soni, V. Sordini, F. Sorrentino, N. Sorrentino, R. Soulard, T. Souradeep, V. Spagnuolo, A. P. Spencer, M. Spera, P. Spinicelli, A. K. Srivastava, V. Srivastava, C. Stachie, F. Stachurski, D. A. Steer, J. Steinlechner, S. Steinlechner, N. Stergioulas, D. J. Stops, K. A. Strain, L. C. Strang, G. Stratta, M. D. Strong, A. Strunk, R. Sturani, A. L. Stuver, M. Suchenek, S. Sudhagar, R. Sugimoto, H. G. Suh, A. G. Sullivan, T. Z. Summerscales, L. Sun, S. Sunil, A. Sur, J. Suresh, P. J. Sutton, Takamasa Suzuki, Takanori Suzuki, Toshikazu Suzuki, B. L. Swinkels, A. Syx, M. J. Szczepańczyk, P. Szewczyk, M. Tacca, H. Tagoshi, S. C. Tait, H. Takahashi, R. Takahashi, S. Takano, H. Takeda, M. Takeda, C. J. Talbot, C. Talbot, N. Tamanini, K. Tanaka, Taiki Tanaka, Takahiro Tanaka, A. J. Tanasijczuk, S. Tanioka, D. B. Tanner, D. Tao, L. Tao, R. D. Tapia, E. N. Tapia San Martín, C. Taranto, A. Taruya, J. D. Tasson, R. Tenorio, J. E. S. Terhune, L. Terkowski, H. Themann, M. P. Thirugnanasambandam, M. Thomas, P. Thomas, S. Thomas, D. Thompson, E. E. Thompson, J. E. Thompson, S. R. Thondapu, K. A. Thorne, E. Thrane, Shubhanshu Tiwari, Srishti Tiwari, V. Tiwari, A. M. Toivonen, A. E. Tolley, T. Tomaru, T. Tomura, M. Tonelli, A. Torres-Forné, C. I. Torrie, I. Tosta e Melo, E. Tournefier, D. Töyrä, A. Trapananti, F. Travasso, G. Traylor, J. Trenado, M. Trevor, M. C. Tringali, A. Tripathee, L. Troiano, A. Trovato, L. Trozzo, R. J. Trudeau, D. Tsai, K. W. Tsang, T. Tsang, J-S. Tsao, M. Tse, R. Tso, S. Tsuchida, L. Tsukada, D. Tsuna, T. Tsutsui, K. Turbang, M. Turconi, C. Turski, D. Tuyenbayev, H. Ubach, A. S. Ubhi, N. Uchikata, T. Uchiyama, R. P. Udall, A. Ueda, T. Uehara, K. Ueno, G. Ueshima, C. S. Unnikrishnan, A. L. Urban, T. Ushiba, A. Utina, H. Vahlbruch, N. Vaidya, G. Vajente, A. Vajpeyi, G. Valdes, M. Valentini, S. Vallero, V. Valsan, N. van Bakel, M. van Beuzekom, M. van Dael, J. F. J. van den Brand, C. Van Den Broeck, D. C. Vander-Hyde, A. Van de Walle, J. van Dongen, H. van Haevermaet, J. V. van Heijningen, J. Vanosky, M. H. P. M. van Putten, Z. van Ranst, N. van Remortel, M. Vardaro, A. F. Vargas, V. Varma, M. Vasúth, A. Vecchio, G. Vedovato, J. Veitch, P. J. Veitch, J. Venneberg, G. Venugopalan, P. Verdier, D. Verkindt, P. Verma, Y. Verma, S. M. Vermeulen, D. Veske, F. Vetrano, A. Viceré, S. Vidyant, A. D. Viets, A. Vijaykumar, V. Villa-Ortega, J. -Y. Vinet, A. Virtuoso, S. Vitale, H. Vocca, E. R. G. von Reis, J. S. A. von Wrangel, C. Vorvick, S. P. Vyatchanin, L. E. Wade, M. Wade, K. J. Wagner, R. C. Walet, M. Walker, G. S. Wallace, L. Wallace, J. Wang, J. Z. Wang, W. H. Wang, R. L. Ward, J. Warner, M. Was, T. Washimi, N. Y. Washington, K. Watada, D. Watarai, J. Watchi, K. E. Wayt, B. Weaver, C. R. Weaving, S. A. Webster, M. Weinert, A. J. Weinstein, R. Weiss, C. M. Weller, R. A. Weller, F. Wellmann, L. Wen, P. Weßels, K. Wette, J. T. Whelan, D. D. White, B. F. Whiting, C. Whittle, O. S. Wilk, D. Wilken, C. E. Williams, D. Williams, M. J. Williams, A. R. Williamson, J. L. Willis, B. Willke, C. C. Wipf, G. Woan, J. Woehler, J. K. Wofford, I. A. Wojtowicz, D. Wong, I. C. F. Wong, M. Wright, C. Wu, D. S. Wu, H. Wu, D. M. Wysocki, L. Xiao, N. Yadav, T. Yamada, H. Yamamoto, K. Yamamoto, T. Yamamoto, K. Yamashita, R. Yamazaki, F. W. Yang, K. Z. Yang, L. Yang, Y. -C. Yang, Y. Yang, Yang Yang, M. J. Yap, D. W. Yeeles, S. -W. Yeh, A. B. Yelikar, J. Yokoyama, T. Yokozawa, J. Yoo, T. Yoshioka, Hang Yu, Haocun Yu, H. Yuzurihara, A. Zadrożny, M. Zanolin, S. Zeidler, T. Zelenova, J. -P. Zendri, M. Zevin, M. Zhan, H. Zhang, J. Zhang, L. Zhang, R. Zhang, T. Zhang, Y. Zhang, C. Zhao, G. Zhao, Y. Zhao, Yue Zhao, Y. Zheng, R. Zhou, X. J. Zhu, Z. -H. Zhu, A. B. Zimmerman, M. E. Zucker, and J. Zweizig
Abstract: We present the results of a model-based search for continuous gravitational waves from the low-mass X-ray binary Scorpius X-1 using LIGO detector data from the third observing run of Advanced LIGO and Advanced Virgo. This is a semicoherent search that uses details of the signal model to coherently combine data separated by less than a specified coherence time, which can be adjusted to balance sensitivity with computing cost. The search covered a range of gravitational-wave frequencies from 25 to 1600 Hz, as well as ranges in orbital speed, frequency, and phase determined from observational constraints. No significant detection candidates were found, and upper limits were set as a function of frequency. The most stringent limits, between 100 and 200 Hz, correspond to an amplitude h(0) of about 10(-25) when marginalized isotropically over the unknown inclination angle of the neutron star's rotation axis, or less than 4 x 10(-26) assuming the optimal orientation. The sensitivity of this search is now probing amplitudes predicted by models of torque balance equilibrium. For the usual conservative model assuming accretion at the surface of the neutron star, our isotropically marginalized upper limits are close to the predicted amplitude from about 70 to 100 Hz; the limits assuming that the neutron star spin is aligned with the most likely orbital angular momentum are below the conservative torque balance predictions from 40 to 200 Hz. Assuming a broader range of accretion models, our direct limits on gravitational-wave amplitude delve into the relevant parameter space over a wide range of frequencies, to 500 Hz or more.
Published: 2022

2. VERITAS: the Very Energetic Radiation Imaging Telescope Array System

Author: T.C Weekes, H Badran, S.D Biller, I Bond, S Bradbury, J Buckley, D Carter-Lewis, M Catanese, S Criswell, W Cui, P Dowkontt, C Duke, D.J Fegan, J Finley, L Fortson, J Gaidos, G.H Gillanders, J Grindlay, T.A Hall, K Harris, A.M Hillas, P Kaaret, M Kertzman, D Kieda, F Krennrich, M.J Lang, S LeBohec, R Lessard, J Lloyd-Evans, J Knapp, B McKernan, J McEnery, P Moriarty, D Muller, P Ogden, R Ong, D Petry, J Quinn, N.W Reay, P.T Reynolds, J Rose, M Salamon, G Sembroski, R Sidwell, P Slane, N Stanton, S.P Swordy, V.V Vassiliev, and S.P Wakely
Subjects: Aperture, primordial black-holes, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Field of view, Reflector (antenna), Stereoscopy, Astrophysics, galactic plane, law.invention, Telescope, Optics, supernova-remnants, neutralinos, law, gamma-ray astronomy, air cerenkov telescopes, tev, Cherenkov radiation, Very Energetic, atmospheric cherenkov radiation, supernova remnants, Physics, Pixel, business.industry, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, gamma-ray telescopes, Astronomy and Astrophysics, acceleration, very-high-energy, pulsars, markarian-421, agn, galaxy, business
Abstract: The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combines the power of the atmospheric Cherenkov imaging technique using a large optical reflector with the power of stereoscopic observatories using arrays of separated telescopes looking at the same shower. The seven identical telescopes in VERITAS, each of aperture 10 m, will be deployed in a filled hexagonal pattern of side 80 m; each telescope will have a camera consisting of 499 pixels with a field of view of 3.5 deg VERITAS will substantially increase the catalog of very high energy (E > 100GeV) gamma-ray sources and greatly improve measurements of established sources., 44 pages, 16 figures
Published: 2016

3. OBSERVATIONS OF THE SHELL-TYPE SUPERNOVA REMNANT CASSIOPEIA A AT TeV ENERGIES WITH VERITAS

Author: R. G. Wagner, Gernot Maier, Stephanie Wissel, C. M. Hui, M. J. Lang, S. P. Wakely, T. B. Humensky, Daniel Gall, B. R. Smith, Geza Gyuk, Y. Butt, D. Boltuch, J. E. Ward, A. Cesarini, John L. Quinn, R. Dickherber, A. J.R. Weinstein, M. Bautista, S. Thibadeau, S. McArthur, V. A. Acciari, D. S. Hanna, David Kieda, J. P. Finley, R. A. Ong, Thomas Weisgarber, N. Karlsson, Jamie Holder, A. McCann, Martin Pohl, Wystan Benbow, T. C. Weekes, M. Beilicke, D. Steele, R. Guenette, V. Bugaev, S. LeBohec, F. Krennrich, E. Roache, P. Fortin, H. J. Rose, J. Grube, A. Furniss, S. P. Swordy, J. Millis, K. Byrum, Matthew J.A. Wood, Tulun Ergin, P. Moriarty, Nicola Galante, J. S. Perkins, M. Kertzman, S. J. Fegan, S. Vincent, M. Schroedter, G. H. Sembroski, P. T. Reynolds, Lucy Fortson, A. Varlotta, Wei Cui, D. Huang, M. Theiling, P. Cogan, T. Aune, Y. C. Chow, V. V. Vassiliev, P. Kaaret, G. Finnegan, A. W. Smith, C. Duke, J. H. Buckley, A. Konopelko, G. H. Gillanders, T. Arlen, L. Ciupik, E. Aliu, H. Krawczynski, K. Ragan, S. M. Bradbury, A. Cannon, D. Pandel, and M. McCutcheon
Subjects: Photon, Astrophysics::High Energy Astrophysical Phenomena, cosmic-rays, Shell (structure), Flux, Astrophysics, 01 natural sciences, Power law, cosmic rays, 0103 physical sciences, air cerenkov telescopes, crab-nebula, Supernova remnant, ism: individual objects (cassiopeia a), 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Cherenkov radiation, acceleration of particles, Physics, magnetic-fields, electron acceleration, particle-acceleration, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy and Astrophysics, gamma-ray emission, Cassiopeia A, gamma rays: ism, rx j1713.7-3946, 13. Climate action, Space and Planetary Science, ism: supernova remnants, a supernova, magic telescope
Abstract: We report on observations of very high energy gamma rays from the shell-type supernova remnant (SNR) Cassiopeia A with the Very Energetic Radiation Imaging Telescope Array System stereoscopic array of four imaging atmospheric Cherenkov telescopes in Arizona. The total exposure time for these observations is 22 hr, accumulated between September and November of 2007. The gamma-ray source associated with the SNR Cassiopeia A was detected above 200 GeV with a statistical significance of 8.3 sigma. The estimated integral flux for this gamma-ray source is about 3% of the Crab-Nebula flux. The photon spectrum is compatible with a power law dN/dE proportional to E(-Gamma) with an index Gamma = 2.61 +/- 0.24(stat) +/- 0.2(sys). The data are consistent with a point-like source. We provide a detailed description of the analysis results and discuss physical mechanisms that may be responsible for the observed gamma-ray emission.
Published: 2010

4. OBSERVATION OF EXTENDED VERY HIGH ENERGY EMISSION FROM THE SUPERNOVA REMNANT IC 443 WITH VERITAS

Author: R. A. Ong, Thomas Weisgarber, S. LeBohec, S. M. Bradbury, A. Cannon, D. Pandel, D. Horan, P. Cogan, J. Grube, David Kieda, L. Ciupik, P. T. Reynolds, A. McCann, Lucy Fortson, M. Kertzman, M. K. Daniel, E. Aliu, H. Krawczynski, A. Varlotta, Gernot Maier, S. P. Swordy, V. V. Vassiliev, Martin Pohl, S. P. Wakely, Daniel Gall, K. Ragan, M. Wood, M. Beilicke, G. Finnegan, T. B. Humensky, A. W. Smith, B. Zitzer, A. Konopelko, R. G. Wagner, C. Duke, M. Schroedter, L. Valcarcel, Vikram V. Dwarkadas, P. Moriarty, Geza Gyuk, A. Weinstein, T. Arlen, P. Colin, A. N. Otte, A. Furniss, J. H. Buckley, P. Kaaret, Tulun Ergin, F. Krennrich, P. Fortin, S. Vincent, D. S. Hanna, Wystan Benbow, M. Theiling, C. M. Hui, Y. Butt, J. P. Finley, V. Bugaev, G. H. Sembroski, J. A. Toner, T. C. Weekes, R. Dickherber, A. Imran, E. Hays, J. S. Perkins, John Kildea, D. A. Williams, R. Guenette, J. Millis, O. Celik, K. Byrum, Wei Cui, Stephanie Wissel, T. Aune, Y. C. K. Chow, S. J. Fegan, D. Steele, V. A. Acciari, M. J. Lang, H. J. Rose, N. Karlsson, A. Cesarini, John L. Quinn, M. Bautista, K. G. Gibbs, Jamie Holder, L. C. Reyes, E. Roache, J. E. Ward, G. H. Gillanders, S. Godambe, M. McCutcheon, and OpenMETU
Subjects: Physics, nebula, 010308 nuclear & particles physics, ic-443, Molecular cloud, cosmic-rays, Flux, Astronomy and Astrophysics, Context (language use), xmm-newton observations, molecular clouds, Astrophysics, gamma-ray emission, 01 natural sciences, Pulsar wind nebula, ism: individual (ic 443=ver j0616.9+2230, = magic j0616+225), radiation, Space and Planetary Science, 0103 physical sciences, Supernova remnant, 010303 astronomy & astrophysics, gamma rays: observations, magic telescope, discovery, pulsar
Abstract: We present evidence that the very high energy (VHE, E > 100 GeV) gamma-ray emission coincident with the supernova remnant IC 443 is extended. IC 443 contains one of the best studied sites of supernova remnant/molecular cloud interaction and the pulsar wind nebula CXOU J061705.3+222127, both of which are important targets for VHE observations. VERITAS observed IC 443 for 37.9 hr during 2007 and detected emission above 300 GeV with an excess of 247 events, resulting in a significance of 8.3 standard deviations (sigma) before trials and 7.5 sigma after trials in a point-source search. The emission is centered at 6(h)16(m)51(s)+22 degrees 30'11 '' (J2000)+/- 0 degrees.03(stat)+/- 0 degrees.08(sys), with an intrinsic extension of 0 degrees.16 +/- 0 degrees.03(stat)+/- 0 degrees.04(sys). The VHE spectrum is well fit by a power law (dN/dE = N(0) x(E/TeV)(-Gamma)) with a photon index of 2.99 +/- 0.38(stat)+/- 0.3(sys) and an integral flux above 300 GeV of (4.63 +/- 0.90(stat)+/- 0.93(sys)) x 10(-12) cm(-2) s(-1). These results are discussed in the context of existing models for gamma-ray production in IC 443.
Published: 2009

5. EVIDENCE FOR LONG-TERM GAMMA-RAY AND X-RAY VARIABILITY FROM THE UNIDENTIFIED TeV SOURCE HESS J0632+057

Author: V. A. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, R. Dickherber, C. Duke, T. Ergin, A. Falcone, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, L. Fortson, A. Furniss, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, D. Petry, M. Pohl, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. Swordy, M. Theiling, J. A. Toner, A. Varlotta, V. V. Vassiliev, S. Vincent, R. G. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, S. Wissel, and M. Wood
Subjects: stars, catalog, Be star, Astrophysics::High Energy Astrophysical Phenomena, binary, FOS: Physical sciences, Astrophysics, telescope, 01 natural sciences, emission, 0103 physical sciences, 010303 astronomy & astrophysics, acceleration of particles, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, stars: individual (hess j0632+057, mwc 148), Gamma ray, X-ray, Astronomy and Astrophysics, Crab Nebula, binaries: general, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, gamma rays: observations, discovery
Abstract: HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hours in 2006, 2008 and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The non-detection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with Swift XRT reveal a factor of 1.8+-0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the ob ject as a gamma-ray emitting binary., Comment: 8 pages, 3 figures, Accepted for publication in The Astrophysical Journal
Published: 2009

6. First results from VERITAS

Author: M. K. Daniel, F. Krennrich, A. Syson, L. Ciupik, S. P. Wakely, Abraham D. Falcone, F. Pizlo, G. H. Sembroski, Daniel Gall, R. A. Ong, H. Manseri, A. McCann, B. Zitzer, D. J. Fegan, S. J. Fegan, D. Steele, J. E. Ward, S. LeBohec, A. Cesarini, J. Hall, Y. C. K. Chow, S. M. Bradbury, Simon P. Swordy, M. Kertzman, John L. Quinn, D. Pandel, Martin Pohl, Henric Krawczynski, K. G. Gibbs, O. Celik, R. J. White, John Toner, J. S. Perkins, Yousaf M. Butt, V. V. Vassiliev, Pierre Colin, V. Bugaev, V. A. Acciari, S. B. Hughes, G. Blaylock, R. Guenette, G. H. Gillanders, Jacek Niemiec, H. M. Badran, R. G. Wagner, P. T. Reynolds, T. Nagai, P. A. Ogden, E. Hays, R. Amini, Geza Gyuk, O. J. Glidewell, D. Horan, Paul Dowkontt, Tulun Ergin, Reshmi Mukherjee, J. Millis, P. Moriarty, P. Fortin, H. J. Rose, Wei Cui, C. M. Hui, A. Konopelko, K. Lee, D. S. Hanna, L. Valcarcel, Lucy Fortson, Matthew Wood, C. Dowdall, M. McCutcheon, A. Imran, John Kildea, J. H. Buckley, M. J. Lang, J. P. Finley, C. Duke, A. W. Smith, E. Roache, T. C. Weekes, Stephanie Wissel, Amanda Weinstein, P. Cogan, Thomas Brian Humensky, K. Ragan, Karen Byrum, M. Schroedter, David Kieda, David A. Williams, J. Grube, Jamie Holder, G. E. Kenny, and P. Kaaret
Subjects: Physics, Nuclear and High Energy Physics, Active galactic nucleus, Sky, media_common.quotation_subject, Astronomy, Gamma-ray astronomy, Astrophysics, Blazar, Instrumentation, Galaxy, Cherenkov radiation, media_common
Abstract: VERITAS is an array of four, 12-m-diameter, Cherenkov telescopes, designed to explore the very-high-energy gamma-ray sky in the energy band between 100 GeV and 50 TeV. Its construction and commissioning have occurred over the past two years and the array has been taking scientific data with three or more telescopes since November 2006. We present results from observations made with VERITAS during the past observing season, including new results on the distant blazar 1ES 1218 + 304 , the active galaxy M87 and the high-mass X-ray binary system LS I + 61 303. We also describe the plans in place for the coming observing seasons.
Published: 2008

7. The Whipple Observatory 10m gamma-ray telescope, 1997–2006

Author: G. E. Kenny, O. Celik, M. J. Lang, P. Moriarty, D. Petry, G. H. Gillanders, A. Konopelko, J. P. Finley, John Kildea, D. A. Carter-Lewis, F. Krennrich, T. C. Weekes, A. Syson, J. Millis, Y. C. K. Chow, J. Lloyd-Evans, I. D. Perez, I. Jung, M. K. Daniel, C. Duke, D. J. Fegan, H. J. Rose, R. J. White, S. P. Wakely, Daniel Gall, S. B. Hughes, J. S. Perkins, M. Jordan, A. W. Smith, J. Grube, Jamie Holder, J. H. Buckley, M. Schroedter, C. Dowdall, K. Gutierrez, John Toner, P. Cogan, S. M. Bradbury, G. H. Sembroski, R. W. Atkins, J. Knapp, P. A. Ogden, I. H. Bond, Henric Krawczynski, Lucy Fortson, R. A. Ong, D. Horan, S. LeBohec, J. Hall, T. Nagai, P. Rebillot, Martin Pohl, K. Kosack, Mark N. Quinn, Wei Cui, L. Valcarcel, M. Kertzman, G. Blaylock, H. M. Badran, V. V. Vassiliev, Tony Hall, Abraham D. Falcone, F. Pizlo, S. J. Fegan, and John L. Quinn
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Context (language use), Gamma-ray astronomy, Cherenkov Telescope Array, law.invention, Primary mirror, Telescope, Observatory, law, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Cherenkov radiation, Fermi Gamma-ray Space Telescope
Abstract: Details are presented of the Whipple Observatory’s 10 m atmospheric Cherenkov telescope and camera, as it evolved during the period 1997 until 2006. The design of the telescope and camera’s optical and electronic systems is discussed together with a detailed description of the four-stage GRANITE (Gamma-RAy New Imaging TElescope) upgrade program, undertaken during the same time period. The objective of the upgrade was to improve the telescope’s sensitivity for the detection of very-high-energy gamma-rays. Results from the program are provided and are briefly discussed in the context of the design of VERITAS.
Published: 2007

8. Status report from VERITAS

Author: Jamie Holder, I. Jung, M. J. Lang, Gernot Maier, S. P. Wakely, R. G. Wagner, D. A. Carter-Lewis, D. Steele, J. S. Perkins, P. Cogan, M. K. Daniel, Henric Krawczynski, David Kieda, E. Hays, John Kildea, Tulun Ergin, G. H. Gillanders, P. Kaaret, K G Gutierrez, A. J.R. Weinstein, Wei Cui, P Fortin, D. Horan, L. Valcarcel, G. E. Kenny, Thomas Brian Humensky, S. P. Swordy, C. Dowdall, David A. Williams, A. D. Falcone, S. J. Fegan, Karen Byrum, Stephanie Wissel, M. Schroedter, Lucy Fortson, S. M. Bradbury, V. V. Vassiliev, F. Pizlo, A. Konopelko, D. S. Hanna, A. Imran, John L. Quinn, G. H. Sembroski, K. G. Gibbs, H. J. Rose, J. H. Buckley, F. Krennrich, S. B. Hughes, Omer Celik, J. A. Toner, G. Blaylock, T. C. Weekes, T. Nagai, P. Moriarty, R. J. White, J. Grube, A. W. Smith, C. Duke, R. A. Ong, S. LeBohec, and J. Millis
Subjects: Physics, History, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, High Energy Physics::Experiment, Astrophysics, Status report, Computer Science Applications, Education
Abstract: VERITAS is a ground-based gamma-ray observatory covering energies between 100 GeV and 50 TeV and will start operating by January 2007. We give a brief report of the construction status and performance characteristics of the telescopes.
Published: 2007

9. Deployment of the VERITAS observatory

Author: S. P. Swordy, R. A. Ong, J. H. Buckley, M Schroedter, H. Manseri, Gernot Maier, F. Pizlo, S. LeBohec, D Horana, J. Lloyd-Evans, S. P. Wakely, G. Walker, Mark N. Quinn, G. Blaylock, J. Knapp, J. Hall, I. H. Bond, K. Ragan, H. M. Badran, F. Krennrich, R. W. Atkins, Vladimir Vassiliev, David Kieda, M. J. Lang, Martin Pohl, K. Kosack, P T Reynolds, Sm Bradbury, John L. Quinn, R. G. Wagner, D. Petry, K. G. Gibbs, Jeremy Perkins, S. Gammell, P Rebillot, E. Hays, P. A. Ogden, A. Syson, Reshmi Mukherjee, G. H. Gillanders, Jamie Holder, C Duke, Da Carter-Lewis, P. Fortin, H. J. Rose, D. J. Fegan, Y. C. Chow, G H Sembroski, Lucy Fortson, B. Power-Mooney, P. Moriarty, T Ergin, Dowdall, J. Grube, T. N. Nagai, A. D. Falcone, M K Daniel, M. A. Olevitch, David A. Williams, John Kildea, J. P. Finley, Henric Krawczynski, T. C. Weekes, R. J. White, S. B. Hughes, M. Kertzmann, Thomas Brian Humensky, P. Cogan, P. J. Boyle, S. J. Fegan, D. Steele, Paul Dowkontt, D. S. Hanna, W CuP, Jeffrey Zweerink, O. Celik, A. Milovanovic, G. E. Kenny, I. de la Calle Perez, P. Kaaret, E. Linton, and L. Valcarcel
Subjects: Physics, History, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Radiation imaging, Astronomy, Cherenkov Telescope Array, Computer Science Applications, Education, law.invention, Telescope, Observatory, Software deployment, law, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: The Very Energetic Radiation Imaging Telescope Array System (VERITAS) being constructed in Southern Arizona consists of an array of four Atmospheric Cherenkov 12m Telescopes designed to observe astrophysical gamma rays in the energy range from 100 GeV to tens of TeV. A first telescope has been in operation on a temporary site since the end of 2004 and meets all specifications. The second is being installed on the same site, 85m from the first, in order to test stereoscopic capabilities. The full system of four telescopes is expected to be installed on the definitive site by the end of 2006.
Published: 2006

10. Minimal stereoscopic analysis for imaging atmospheric Cherenkov telescope arrays

Author: S. LeBohec, P. Jordan, and C. Duke
Subjects: Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Centroid, Astronomy and Astrophysics, Stereoscopy, Astrophysics, Cherenkov Telescope Array, law.invention, Telescope, Optics, law, Trajectory, business, Cherenkov radiation
Abstract: The trajectory of a primary γ-ray detected with an array of at least four atmospheric Cherenkov imaging telescopes can be reconstructed from the shower image centroid positions and geometrical considerations independent of the primary energy. Using only the image centroid positions some cosmic-ray discrimination is also possible. This minimal approach opens the possibility of pushing the analysis threshold to lower values, close to the hardware threshold.
Published: 2005

11. VERITAS: the Very Energetic Radiation Imaging Telescope Array System

Author: M. K. Daniel, S. P. Wakely, G. Walker, John Kildea, J. H. Buckley, David Kieda, Mark N. Quinn, A. Jarvis, S. M. Bradbury, S. P. Swordy, A. Milovanovic, Wei Cui, A. Syson, D. Horan, F. Krennrich, M. Schroedter, V. V. Vassiliev, Abraham D. Falcone, G. E. Kenny, H. J. Rose, R. Pallassini, Lucy Fortson, P. J. Boyle, E. Linton, D. S. Hanna, J. A. Gaidos, M. D'Vali, P. Moriarty, S. J. Nolan, M. Jordan, Jeffrey Zweerink, J. Hall, K. Ragan, Tony Hall, J. Knapp, K. Kosack, D. A. Carter-Lewis, D. Petry, J. Lloyd-Evans, Dietrich Müller, G. H. Gillanders, B. Power-Mooney, G. H. Sembroski, Jamie Holder, S. LeBohec, I. de la Calle Perez, I. H. Bond, M. J. Lang, S. J. Fegan, Henric Krawczynski, M. Kertzman, T. N. Nagai, J. Grube, P. Rebillot, P. T. Reynolds, J. P. Finley, C. Duke, T. C. Weekes, D. J. Fegan, John L. Quinn, K. G. Gibbs, R. A. Ong, S. Gammell, A. M. Hillas, and O. Celik
Subjects: Physics, tev energies, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Astrophysics, First light, Cherenkov Telescope Array, law.invention, Telescope, Primary mirror, Space and Planetary Science, law, Observatory, gamma-ray astronomy, atmospheric cherenkov detectors, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Very Energetic, Cherenkov radiation
Abstract: The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is the major next generation imaging atmospheric Cherenkov γ-ray telescope in the western hemisphere and will be located in southern Arizona nearby Kitt Peak National Observatory. The VERITAS observatory will provide unprecedented sensitivity to photon energies between 50 GeV and 50 TeV. The first stage is an array of four telescopes to be fully operational in early 2006, with an expansion to seven telescopes envisioned for 2008. The construction of a prototype telescope is underway, for which first light is expected in Fall 2003. The technical concept is outlined and a progress report is given.
Published: 2004

12. The TeV Spectrum of H1426+428

Author: Vladimir Vassiliev, Dietrich Müller, Jamie Holder, S. M. Bradbury, Frank Krennrich, M. Kertzman, S. J. Fegan, A. M. Hillas, T. N. Nagai, John Kildea, D. J. Fegan, D. Horan, Wei Cui, M. Schroedter, J. Hall, S. Gammell, J. P. Finley, K. Kosack, J. Knapp, C. Duke, D. A. Carter-Lewis, T. C. Weekes, S. P. Swordy, R. A. Ong, Morgan T. Page, R. Sidwell, P. Moriarty, I. H. Bond, S. P. Wakely, S. LeBohec, N. Stanton, B. Power-Mooney, G. Walker, I. de la Calle Perez, D. Petry, Tony Hall, J. H. Buckley, J. A. Gaidos, David Kieda, G. H. Sembroski, R. Pallassini, M. Jordan, Abraham D. Falcone, H. J. Rose, N. W. Reay, John L. Quinn, K. G. Gibbs, and P. T. Reynolds
Subjects: Normalization (statistics), Physics, ray, Astrophysics::High Energy Astrophysical Phenomena, Spectrum (functional analysis), Flux, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Space (mathematics), Power law, objects, Crab Nebula, Space and Planetary Science, bl lacertae objects : individual (h1426+428), gamma rays : observations, High Energy Physics::Experiment, Blazar, BL Lac object
Abstract: The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed the 2001 portion of the data used in the detection in order to examine the spectrum of H1426+428 above 250 GeV. We find that the time-averaged spectrum agrees with a power law of the shape dF/dE = 10^(-7.31 +- 0.15(stat) +- 0.16(syst)) x E^(-3.50 +- 0.35(stat) +- 0.05(syst)) m^(-2)s^(-1)TeV^(-1) The statistical evidence from our data for emission above 2.5 TeV is 2.6 sigma. With 95% c.l., the integral flux of H1426+428 above 2.5 TeV is larger than 3% of the corresponding flux from the Crab Nebula. The spectrum is consistent with the (non-contemporaneous) measurement by Aharonian et al. (2002) both in shape and in normalization. Below 800 GeV, the data clearly favours a spectrum steeper than that of any other TeV Blazar observed so far indicating a difference in the processes involved either at the source or in the intervening space., Comment: LaTeX, 8 pages, 4 figures, accepted for publication in ApJ
Published: 2002

13. THE JUNE 2008 FLARE OF MARKARIAN 421 FROM OPTICAL TO TeV ENERGIES

Author: I. Donnarumma, V. Vittorini, S. Vercellone, E. Del Monte, M. Feroci, F. D'Ammando, L. Pacciani, A. W. Chen, M. Tavani, A. Bulgarelli, A. Giuliani, F. Longo, G. Pucella, A. Argan, G. Barbiellini, F. Boffelli, P. Caraveo, P. W. Cattaneo, V. Cocco, E. Costa, G. De Paris, G. Di Cocco, Y. Evangelista, M. Fiorini, T. Froysland, M. Frutti, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, I. Lapshov, F. Lazzarotto, P. Lipari, M. Marisaldi, M. Mastropietro, S. Mereghetti, E. Morelli, A. Morselli, A. Pellizzoni, F. Perotti, P. Picozza, G. Porrovecchio, M. Prest, M. Rapisarda, A. Rappoldi, A. Rubini, P. Soffitta, M. Trifoglio, A. Trois, E. Vallazza, A. Zambra, D. Zanello, C. Pittori, P. Santolamazza, F. Verrecchia, P. Giommi, S. Colafrancesco, L. Salotti, M. Villata, C. M. Raiteri, W. P. Chen, N. V. Efimova, B. Jordan, T. S. Konstantinova, E. Koptelova, O. M. Kurtanidze, V. M. Larionov, J. A. Ros, A. C. Sadun, H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, H. Bartko, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon, T. Bretz, I. Britvitch, M. Camara, E. Carmona, A. Chilingarian, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, V. Curtef, F. Dazzi, A. De Angelis, E. De Cea del Pozo, R. de los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Dominguez, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernández, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, F. Goebel, D. Hadasch, M. Hayashida, A. Herrero, D. Höhne-Mönch, J. Hose, C. C. Hsu, S. Huber, T. Jogler, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, A. Raymers, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sanchez-Conde, P. Sartori, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, K. Shinozaki, S. N. Shore, N. Sidro, A. Sierpowska-Bartosik, A. Sillanpää, J. Sitarek, D. Sobczynska, F. Spanier, A. Stamerra, L. S. Stark, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, M. Tluczykont, D. F. Torres, N. Turini, H. Vankov, A. Venturini, V. Vitale, R. M. Wagner, W. Wittek, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, V. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. Byrum, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. K. Daniel, R. Dickherber, C. Duke, T. Ergin, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, A. Furniss, D. Gall, G. H. Gillanders, R. Guenette, G. Gyuk, J. Grube, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. Brian Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, A. Milovanovic, P. Moriarty, T. Nagai, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, A. Pichel, M. Pohl, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, M. Theiling, J. A. Toner, L. Valcarcel, A. Varlotta, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, D. A. Williams, S. Wissel, M. Wood, B. Zitzer, I., Donnarumma, V., Vittorini, S., Vercellone, E. D., Monte, M., Feroci, F., D'Ammando, L., Pacciani, A. W., Chen, M., Tavani, A., Bulgarelli, A., Giuliani, Longo, Francesco, G., Pucella, A., Argan, G., Barbiellini, F., Boffelli, P., Caraveo, P. W., Cattaneo, V., Cocco, E., Costa, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Fiorini, T., Froysland, M., Frutti, F., Fuschino, M., Galli, F., Gianotti, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, M., Mastropietro, S., Mereghetti, E., Morelli, A., Morselli, A., Pellizzoni, F., Perotti, P., Picozza, G., Porrovecchio, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, C., Pittori, P., Santolamazza, F., Verrecchia, P., Giommi, S., Colafrancesco, L., Salotti, M., Villata, C. M., Raiteri, W. P., Chen, N. V., Efimova, B., Jordan, T. S., Konstantinova, E., Koptelova, O. M., Kurtanidze, V. M., Larionov, J. A., Ro, A. C., Sadun, H., Anderhub, L. A., Antonelli, P., Antoranz, M., Backe, C., Baixera, S., Balestra, J. A., Barrio, H., Bartko, D., Bastieri, J. B., Gonzalez, J. K., Becker, W., Bednarek, K., Berger, E., Bernardini, A., Biland, R. K., Bock, G., Bonnoli, P., Borda, D. B., Tridon, V., Bosch Ramon, T., Bretz, I., Britvitch, M., Camara, E., Carmona, A., Chilingarian, S., Commichau, J. L., Contrera, J., Cortina, M. T., Costado, S., Covino, V., Curtef, F., Dazzi, A. D., Angeli, E. D., Del Pozo, R. D., Reye, B. D., Lotto, M. D., Maria, F. D., Sabata, C. D., Mendez, A., Dominguez, D., Dorner, M., Doro, D., Elsaesser, M., Errando, D., Ferenc, E., Fernandez, R., Firpo, M. V., Fonseca, L., Font, N., Galante, R. J. G., Lopez, M., Garczarczyk, M., Gaug, F., Goebel, D., Hadasch, M., Hayashida, A., Herrero, D., Hohne Monch, J., Hose, C. C., Hsu, S., Huber, T., Jogler, D., Kranich, A. L., Barbera, A., Laille, E., Leonardo, E., Lindfor, S., Lombardi, M., Lopez, E., Lorenz, P., Majumdar, G., Maneva, N., Mankuzhiyil, K., Mannheim, L., Maraschi, M., Mariotti, M., Martinez, D., Mazin, M., Meucci, M., Meyer, J. M., Miranda, R., Mirzoyan, J., Moldon, M., Mole, A., Moralejo, D., Nieto, K., Nilsson, J., Ninkovic, I., Oya, R., Paoletti, J. M., Parede, M., Pasanen, D., Pascoli, F., Pau, R. G., Pegna, M. A., Perez Torre, M., Persic, L., Peruzzo, F., Prada, E., Prandini, N., Puchade, A., Raymer, W., Rhode, M., Ribo, J., Rico, M., Rissi, A., Robert, S., Rugamer, A., Saggion, T. Y., Saito, M., Salvati, M., Sanchez Conde, P., Sartori, K., Satalecka, V., Scalzotto, V., Scapin, T., Schweizer, M., Shayduk, K., Shinozaki, S. N., Shore, N., Sidro, A., Sierpowska Bartosik, A., Sillanpaa, J., Sitarek, D., Sobczynska, F., Spanier, A., Stamerra, L. S., Stark, L., Takalo, F., Tavecchio, P., Temnikov, D., Tescaro, M., Teshima, M., Tluczykont, D. F., Torre, N., Turini, H., Vankov, A., Venturini, V., Vitale, R. M., Wagner, W., Wittek, V., Zabalza, F., Zandanel, R., Zanin, J., Zapatero, V., Acciari, E., Aliu, T., Arlen, M., Beilicke, W., Benbow, S. M., Bradbury, J. H., Buckley, V., Bugaev, Y., Butt, K., Byrum, A., Cannon, A., Cesarini, Y. C., Chow, L., Ciupik, P., Cogan, P., Colin, W., Cui, M. K., Daniel, R., Dickherber, C., Duke, T., Ergin, S. J., Fegan, J. P., Finley, G., Finnegan, P., Fortin, A., Furni, D., Gall, G. H., Gillander, R., Guenette, G., Gyuk, J., Grube, D., Hanna, J., Holder, D., Horan, C. M., Hui, T. B., Humensky, A., Imran, P., Kaaret, N., Karlsson, M., Kertzman, D., Kieda, J., Kildea, A., Konopelko, H., Krawczynski, F., Krennrich, M. J., Lang, S., Lebohec, G., Maier, A., Mccann, M., Mccutcheon, A., Milovanovic, P., Moriarty, T., Nagai, R. A., Ong, A. N., Otte, D., Pandel, J. S., Perkin, A., Pichel, M., Pohl, K., Ragan, L. C., Reye, P. T., Reynold, E., Roache, H. J., Rose, M., Schroedter, G. H., Sembroski, A. W., Smith, D., Steele, S. P., Swordy, M., Theiling, J. A., Toner, L., Valcarcel, A., Varlotta, S. P., Wakely, J. E., Ward, T. C., Weeke, A., Weinstein, D. A., William, S., Wissel, M., Wood, B., Zitzer, Donnarumma I, Vittorini V, Vercellone S, del Monte E, Feroci M, DAmmando F, Pacciani L, Chen A W, Tavani M, Bulgarelli A, Giuliani A, Longo F, Pucella G, Argan A, Barbiellini G, Boffelli F, Caraveo P, Cattaneo P W, Cocco V, Costa E, DeParis G, Di Cocco G, Evangelista Y, Fiorini M, Froysland T, Frutti M, Fuschino F, Galli M, Gianotti F, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mastropietro M, Mereghetti S, Morelli E, Morselli A, Pellizzoni A, Perotti F, Picozza P, Porrovecchio G, Prest M, Rapisarda M, Rappoldi A, Rubini A, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zambra A, Zanello D, Pittori C, Santolamazza P, Verrecchia F, Giommi P, Colafrancesco S, Salotti L, Villata M, Raiteri C M, Chen W P, Efimova N V, Jordan B, Konstantinova T S, Koptelova E, Kurtanidze O M, Larionov V M, Ros J A, Sadun A C, Anderhub H, Antonelli L A, Antoranz P, Backes M, Baixeras C, Balestra S, Barrio J A, Bartko H, Bastieri D, González J Becerra, Becker J K, Bednarek W, Berger K, Bernardini E, Biland A, Bock R K, Bonnoli G, Bordas P, Tridon D Borla, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras J L, Cortina J, Costado M T, Covino S, Curtef V, Dazzi F, DeAngelis A, DeCea del Pozo E, de los Reyes R, DeLotto B, DeMaria M, DeSabata F, Mendez C Delgado, Dominguez A, Dorner D, Doro M, Elsaesser D, Errando M, Ferenc D, Fernández E, Firpo R, Fonseca M V, Font L, Galante N, García López R J, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne-Mönch D, Hose J, Hsu C C, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, López M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martínez M, Mazin D, Meucci M, Meyer M, Miranda J M, Mirzoyan R, Moldón J, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Oya I, Paoletti R, Paredes J M, Pasanen M, Pascoli D, Pauss F, Pegna R G, Perez-Torres M A, Persic M, Peruzzo L, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito T Y, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore S N, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sitarek J, Sobczynska D, Spanier F, Stamerra A, Stark L S, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres D F, Turini N, Vankov H, Venturini A, Vitale V, Wagner R M, Wittek W, Zabalza V, Zandanel F, Zanin R, Zapatero J, Acciari V, Aliu E, Arlen T, Beilicke M, Benbow W, Bradbury S M, Buckley J H, Bugaev V, Butt Y, Byrum K, Cannon A, Cesarini A, Chow Y C, Ciupik L, Cogan P, Colin P, Cui W, Daniel M K, Dickherber R, Duke C, Ergin T, Fegan S J, Finley J P, Finnegan G, Fortin P, Furniss A, Gall D, Gillanders G H, Guenette R, Gyuk G, Grube J, Hanna D, Holder J, Horan D, Hui C M, Humensky T Brian, Imran A, Kaaret P, Karlsson N, Kertzman M, Kieda D, Kildea J, Konopelko A, Krawczynski H, Krennrich F, Lang M J, LeBohec S, Maier G, McCann A, McCutcheon M, Milovanovic A, Moriarty P, Nagai T, Ong R A, Otte A N, Pandel D, Perkins J S, Pichel A, Pohl M, Ragan K, Reyes L C, Reynolds P T, Roache E, Rose H J, Schroedter M, Sembroski G H, Smith A W, Steele D, Swordy S P, Theiling M, Toner J A, Valcarcel L, Varlotta A, Wakely S P, Ward J E, Weekes T C, Weinstein A, Williams D A, Wissel S, Wood M, and Zitzer B
Subjects: campaign, Raigs còsmics, BL Lacertae: individual: Mrk421, galaxies: jets, X-Rays: Galaxies, gamma rays: observations, radiation mechanisms: nonthermal, bl-lacertae objects, blazars, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Gamma-ray Astronomy, law.invention, Raigs gamma, law, optical, MAGIC (telescope), Agile, blazr, X-ray, gamma, high energy observation, 010303 astronomy & astrophysics, webt, Physics, x-ray-spectra, Astrophysics (astro-ph), gamma-rays, lac objects, xmm-newton, Spectral energy distribution, Electrónica, Física nuclear, Raigs X, Electricidad, Flare, outburst, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 0103 physical sciences, X-rays, BL Lacertae objects: individual (Mrk 421) – gamma rays: observations – galaxies: jets – radiation mechanisms: non-thermal – X-rays: galaxies, Blazar, Cosmic rays, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Active Galactic Nuclei, radiation mechanisms: non-thermal, Light curve, Galaxies, Galàxies, MAGIC telescope, Space and Planetary Science, Very High Energy Gamma-ray Astronomy, ddc:520, AGILE satellite, bl lacertae objects: individual (mrk 421), Energy (signal processing), Lepton
Abstract: We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on June 9--15, with $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than the average flux observed by EGRET by a factor of $\sim$3, but still consistent with the highest EGRET flux. In hard X-rays (20-60 keV) SuperAGILE resolved a 5-day flare (June 9-15) peaking at $\sim$ 55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior are also detected in the simultaneous optical data provided by the GASP-WEBT. A Swift/XRT observation near the flaring maximum revealed the highest 2-10 keV flux ever observed from this source, of 2.6 $\times 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (i.e. > 100 mCrab). A peak synchrotron energy of $\sim$3 keV was derived, higher than typical values of $\sim$0.5-1 keV. VHE observations with MAGIC and VERITAS on June 6-8 show the flux peaking in a bright state, well correlated with the X-rays. This extraordinary set of simultaneous data, covering a twelve-decade spectral range, allowed for a deep analysis of the spectral energy distribution as well as of correlated light curves. The $\gamma$-ray flare can be interpreted within the framework of the synchrotron self-Compton model in terms of a rapid acceleration of leptons in the jet., Comment: accepted for publication in ApJL, 7 pages, 2 figures, 1 table
Published: 2009

14. Cutoff in the T[CLC]e[/CLC]V Energy Spectrum of Markarian 421 during Strong Flares in 2001

Author: H. J. Rose, M. Catanese, M. J. Lang, J. A. Gaidos, I. H. Bond, G. H. Sembroski, J. P. Finley, I. de la Calle Perez, R. A. Ong, John Kildea, T. C. Weekes, B. McKernan, S. LeBohec, S. Dunlea, M. Kertzman, R. Pallassini, A. M. Hillas, R. Sidwell, M. Jordan, Frank Krennrich, J. Knapp, Wei Cui, S. P. Swordy, Dietrich Müller, K. Kosack, N. W. Reay, S. M. Bradbury, Jamie Holder, P. Moriarty, D. A. Carter-Lewis, N. Stanton, H. M. Badran, P. T. Reynolds, Tony Hall, J. H. Buckley, S. P. Wakely, David Kieda, John L. Quinn, K. G. Gibbs, D. J. Fegan, D. Das, Vladimir Vassiliev, D. Horan, S. J. Fegan, D. Petry, and G. H. Gillanders
Subjects: Long lasting, mkn-501, Astrophysics::High Energy Astrophysical Phenomena, hegra, Astrophysics, Power law, objects, blazar, jet, Energy spectrum, Statistical precision, photons, Cutoff, gamma rays : observations, Blazar, Background radiation, Physics, active galaxy markarian-421, Astronomy and Astrophysics, gamma-rays, acceleration, Space and Planetary Science, Spectral energy distribution, High Energy Physics::Experiment, bl lacertae objects : individual (markarian 421), cherenkov telescope system
Abstract: Exceptionally strong and long lasting flaring activity of the blazar Markarian 421 (Mrk 421) occurred between January and March 2001. Based on the excellent signal-to-noise ratio of the data we derive the energy spectrum between 260 GeV - 17 TeV with unprecedented statistical precision. The spectrum is not well described by a simple power law even with a curvature term. Instead the data can be described by a power law with exponential cutoff: $\rm {{dN}\over{dE}} \propto \rm E^{-2.14 \pm 0.03_{stat}} \times e^{-E/E_{0}} m^{-2} s^{-1} TeV^{-1}$ with $\rm E_{0} = 4.3 \pm 0.3_{stat} TeV$. Mrk 421 is the second $\gamma$-ray blazar that unambiguously exhibits an absorption-like feature in its spectral energy distribution at 3-6 TeV suggesting that this may be a universal phenomenon, possibly due to the extragalactic infra-red background radiation.
Published: 2001

15. Search for a correlation between very-high-energy gamma rays and giant radio pulses in the Crab pulsar

Author: Matthias Beilicke, J. P. Dumm, Martin Pohl, G. Tešić, Q. Feng, V. Bugaev, T. Aune, A. Varlotta, R. Dickherber, T. B. Humensky, T. J. N. Nelson, S. Thibadeau, A. McCann, M. P. Connolly, Maxim Lyutikov, R. G. Wagner, Henric Krawczynski, E. Aliu, A. J.R. Weinstein, I. Telezhinsky, Jamie Holder, F. Krennrich, H. Prokoph, S. Vincent, L. C. Reyes, K. Lee, Sinéad M. Griffin, D. B. Saxon, Karen Byrum, D. S. Hanna, N. H. Park, Lucy Fortson, D. Staszak, K. Tsurusaki, M. Theiling, T. C. Arlen, K. Ragan, Gareth Hughes, Amy Furniss, P. Kaaret, M. Schroedter, B. Zitzer, E. Collins-Hughes, Gernot Maier, M. J. Lang, G. H. Gillanders, S. Godambe, S. P. Wakely, G. H. Sembroski, Daniel Gall, R. Welsing, A. N. Otte, Matthew R. Orr, L. Ciupik, A. Cesarini, R. A. Ong, V. Kondratiev, David A. Williams, John L. Quinn, A. Bouvier, J. H. Buckley, A. D. Falcone, J. P. Finley, M. Vivier, T. C. Weekes, S. LeBohec, David Kieda, S. McArthur, Y. Khassen, P. T. Reynolds, Geza Gyuk, Pratik Majumdar, S. Archambault, Reshmi Mukherjee, Wystan Benbow, J. S. Perkins, P. Moriarty, Nicola Galante, J. Grube, N. Karlsson, G. Finnegan, A. W. Smith, A. S Madhavan, C. Duke, E. Roache, G. D. Şentürk, H. Huan, A. O'Faolain de Bhroithe, S. Federici, and Wei Cui
Subjects: High energy, nebula, pulsars: individual: b0531+21, Flux, FOS: Physical sciences, Astrophysics, 01 natural sciences, Arrival time, law.invention, Radio telescope, Telescope, law, Time windows, 0103 physical sciences, emission, photons, rays: stars, geminga, 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), model, 010308 nuclear & particles physics, Crab Pulsar, Gamma ray, Institut für Physik und Astronomie, Astronomy and Astrophysics, telescopes, universe, Space and Planetary Science, range, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present the results of a joint observational campaign between the Green Bank radio telescope and the VERITAS gamma-ray telescope, which searched for a correlation between the emission of very-high-energy (VHE) gamma rays ($E_{\gamma} >$ 150 GeV) and Giant Radio Pulses (GRPs) from the Crab pulsar at 8.9 GHz. A total of 15366 GRPs were recorded during 11.6 hours of simultaneous observations, which were made across four nights in December 2008 and in November and December 2009. We searched for an enhancement of the pulsed gamma-ray emission within time windows placed around the arrival time of the GRP events. In total, 8 different time windows with durations ranging from 0.033 ms to 72 s were positioned at three different locations relative to the GRP to search for enhanced gamma-ray emission which lagged, led, or was concurrent with, the GRP event. Further, we performed separate searches on main pulse GRPs and interpulse GRPs and on the most energetic GRPs in our data sample. No significant enhancement of pulsed VHE emission was found in any of the preformed searches. We set upper limits of 5-10 times the average VHE flux of the Crab pulsar on the flux simultaneous with interpulse GRPs on single-rotation-period time scales. On $\sim$8-second time scales around interpulse GRPs, we set an upper limit of 2-3 times the average VHE flux. Within the framework of recent models for pulsed VHE emission from the Crab pulsar, the expected VHE-GRP emission correlations are below the derived limits., Comment: 12 pages, 12 figures, To appear in The Astrophysical Journal
Published: 2012

16. Veritas observations of day-scale flaring of M 87 in 2010 April

Author: R. Dickherber, A. Cesarini, John L. Quinn, S. Thibadeau, Sinéad M. Griffin, M. Kertzman, J. P. Finley, K. Tsurusaki, H. Prokoph, P. Kaaret, Geza Gyuk, J. Ruppel, R. Guenette, T. C. Weekes, Pratik Majumdar, A. Pichel, S. Godambe, Nahee Park, Reshmi Mukherjee, M. P. Connolly, A. McCann, H. J. Rose, K. L. Byrum, E. Collins-Hughes, J. Tyler, N. Karlsson, J. H. Buckley, E. Aliu, A. N. Otte, David A. Williams, Gernot Maier, L. Ciupik, G. Tešić, C. M. Hui, Wystan Benbow, Jamie Holder, Henric Krawczynski, Daniel Gall, A. Varlotta, M. J. Lang, A. J.R. Weinstein, L. C. Reyes, C. Skole, Amy Furniss, Matthias Beilicke, M. Pohl, Wei Cui, D. Staszak, Paul D. Nuñez, S. M. Bradbury, K. Ragan, R. A. Ong, Thomas Weisgarber, Matthew R. Orr, S. P. Wakely, V. V. Vassiliev, G. Hughes, F. Krennrich, A. D. Falcone, A. Bouvier, J. S. Perkins, S. LeBohec, J. E. Ward, A. Cannon, M. Theiling, Lucy Fortson, D. B. Saxon, T. Aune, S. McArthur, V. Bugaev, G. H. Sembroski, T. B. Humensky, B. Zitzer, Manel Errando, D. B. Kieda, G. Finnegan, A. S Madhavan, C. Duke, E. Roache, G. D. Şentürk, H. Huan, P. Moriarty, Nicola Galante, J. Grube, D. S. Hanna, T. C. Arlen, A. Imran, P. T. Reynolds, M. Schroedter, S. Vincent, and M. Vivier
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Radio galaxy, Ciencias Físicas, Phase (waves), FOS: Physical sciences, Flux, radio galaxy m87, Astrophysics, Electron, telescope, agns, 01 natural sciences, 7. Clean energy, Spectral line, blazar, law.invention, purl.org/becyt/ford/1 [https], law, jet, gamma rays: galaxies, 0103 physical sciences, galaxies: individual (m 87, ver j1230+123), hst-1, 010303 astronomy & astrophysics, Physics, Spectral index, tev emission, variability, 010308 nuclear & particles physics, Institut für Physik und Astronomie, Astronomy and Astrophysics, purl.org/becyt/ford/1.3 [https], gamma-ray emission, Astronomía, Space and Planetary Science, individual (M 87, VER J1230+123) [galaxies], Rise time, galaxies [gamma rays], CIENCIAS NATURALES Y EXACTAS, supermassive black-hole, Astrophysics - Cosmology and Nongalactic Astrophysics, Flare
Abstract: VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of (0.70 +- 0.16) X 10^{-11} cm^{-2} s^{-1} at energies above 350GeV. In 2010 April, VERITAS detected a flare from M87 with peak flux of (2.71 +- 0.68) X 10^{-11} cm^{-2} s^{-1} for E>350GeV. The source was observed for six consecutive nights during the flare, resulting in a total of 21 hr of good quality data. The most rapid flux variation occurred on the trailing edge of the flare with an exponential flux decay time of 0.90^{+0.22}_{-0.15} days. The shortest detected exponential rise time is three times as long, at 2.87^{+1.65}_{-0.99} days. The quality of the data sample is such that spectral analysis can be performed for three periods: rising flux, peak flux, and falling flux. The spectra obtained are consistent with power-law forms. The spectral index at the peak of the flare is equal to 2.19 +- 0.07. There is some indication that the spectrum is softer in the falling phase of the flare than the peak phase, with a confidence level corresponding to 3.6 standard deviations. We discuss the implications of these results for the acceleration and cooling rates of VHE electrons in M87 and the constraints they provide on the physical size of the emitting region., Accepted for publication in ApJ; 17 pages, 5 figures; Corresponding author: C. M. Hui
Published: 2012

17. An experiment to locate the site in M87 of TeV flaring

Author: Lukasz Stawarz, S. LeBohec, Francesco Massaro, Reshmi Mukherjee, Matthias Beilicke, Dieter Horns, C. C. Cheung, D. E. Harris, Martin Raue, Pierre Colin, S. J. Wagner, Robert Wagner, and D. Mazin
Subjects: Physics, Elevated level, law, Radio galaxy, general [X-rays], active [galaxies], jets [galaxies], Astronomy, individual(M87) [galaxies], Astrophysics, Flare, law.invention
Abstract: We describe a Chandra ToO project designed to isolate the site of TeV flaring in the radio galaxy M87. To date, we have triggered the Chandra observations only once (2010 April) and by the time of our first observation, the TeV flare had ended. However, we found that the X-ray intensity of the unresolved nucleus was at an elevated level at the time of our first of 9 observations. Of the ~70 observations we have made of the M87 jet covering 9 years, the nucleus was measured at > 1 keV/s only 3 times. Two of these occasions can be associated with TeV flaring, and at the time of the third event, there were no TeV monitoring activities. We discuss the implications of these data.
Published: 2012

18. Section on Supernova Remnants and Cosmic Rays of the White Paper on the Status and Future of Ground-Based Gamma-Ray Astronomy

Author: John F. Beacom, Roger Blandford, David Kieda, Donald C. Ellison, A. M. Bykov, A. A. Abdo, B. Humensky, S. LeBohec, Elizabeth Hays, Terry J. Jones, Patrick Slane, Igor V. Moskalenko, Stefan Funk, P. Kaaret, A. Strong, S. P. Wakely, Martin Pohl, A. M. Atoyan, Yousaf M. Butt, Matthew G. Baring, Peter Mészáros, and Francis Halzen
Subjects: Physics, Particle acceleration, Acceleration, Supernova, Astrophysics::High Energy Astrophysical Phenomena, Cosmic background radiation, Astronomy, Cosmic ray, Gamma-ray astronomy, Astrophysics, Galaxy, Charged particle
Abstract: This is a report on the findings of the SNR/cosmic-ray working group for the white paper on the status and future of ground-based gamma-ray astronomy. The white paper is an APS commissioned document, and the overall version has also been released and can be found on astro-ph. This detailed section of the white paper discusses the status of past and current attempts to observe shell-type supernova remnants and diffuse emission from cosmic rays at GeV-TeV energies. We concentrate on the potential of future ground-based gamma-ray experiments to study the acceleration of relativistic charged particles which is one of the main unsolved, yet fundamental, problems in modern astrophysics. The acceleration of particles relies on interactions between energetic particles and magnetic turbulence. In the case of SNRs we can perform spatially resolved studies in systems with known geometry, and the plasma physics deduced from these observations will help us to understand other systems where rapid particle acceleration is believed to occur and where observations as detailed as those of SNRs are not possible.
Published: 2011

19. Veritas observations of the tev binary ls i +61° 303 during 2008-2010

Author: A. McCann, R. Dickherber, S. Thibadeau, E. Aliu, Sinéad M. Griffin, Wystan Benbow, M. P. Connolly, Gareth Hughes, R. Guenette, M. Kertzman, Gernot Maier, D. B. Saxon, N. H. Park, S. P. Wakely, Daniel Gall, J. H. Buckley, A. N. Otte, Henric Krawczynski, Jamie Holder, M. J. Lang, L. Ciupik, S. Vincent, A. J.R. Weinstein, J. S. Perkins, M. Vivier, L. C. Reyes, A. Varlotta, Reshmi Mukherjee, J. E. Ward, G. H. Sembroski, R. A. Ong, Thomas Weisgarber, M. Pohl, P. Moriarty, Nicola Galante, B. Zitzer, Geza Gyuk, Pratik Majumdar, S. LeBohec, J. Grube, Manel Errando, David A. Williams, F. Krennrich, A. D. Falcone, S. M. Bradbury, Matthew R. Orr, K. Tsurusaki, D. B. Kieda, Lucy Fortson, J. P. Finley, M. Theiling, D. Staszak, Victor A. Acciari, K. Ragan, G. Demet Senturk, C. M. Hui, Wei Cui, T. C. Weekes, Amy Furniss, A. Cannon, G. H. Gillanders, S. Godambe, H. J. Rose, H. Prokoph, V. V. Vassiliev, N. Karlsson, T. Aune, J. Ruppel, S. McArthur, V. Bugaev, Karen Byrum, G. Finnegan, A. W. Smith, C. Duke, M. Schroedter, E. Roache, A. Cesarini, G. Tešić, John L. Quinn, P. Kaaret, E. Collins-Hughes, T. B. Humensky, D. S. Hanna, T. C. Arlen, P. T. Reynolds, and Matthias Beilicke
Subjects: Astrophysics::High Energy Astrophysical Phenomena, ls-i-+61-303, FOS: Physical sciences, Proportional counter, Flux, Binary number, Astrophysics, orbital modulation, 01 natural sciences, law.invention, spectrum, Telescope, law, jet, 0103 physical sciences, MAGIC (telescope), microquasar, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, high-energy emission, 010308 nuclear & particles physics, Astronomy and Astrophysics, gamma rays: general, gamma-ray emission, radio, Orbit, Crab Nebula, binaries: general, x-ray, 13. Climate action, Space and Planetary Science, x-rays: binaries, Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope
Abstract: We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC have reported detections of TeV emission near the apastron phases of the binary orbit. The observations presented here show no strong evidence for TeV emission during these orbital phases; however, during observations taken in late 2010, significant emission was detected from the source close to the phase of superior conjunction (much closer to periastron passage) at a 5.6 standard deviation (5.6 sigma) post-trials significance. In total, between October 2008 and December 2010 a total exposure of 64.5 hours was accumulated with VERITAS on LS I +61 303, resulting in an excess at the 3.3 sigma significance level for constant emission over the entire integrated dataset. The flux upper limits derived for emission during the previously reliably active TeV phases (i.e. close to apastron) are less than 5% of the Crab Nebula flux in the same energy range. This result stands in apparent contrast to previous observations by both MAGIC and VERITAS which detected the source during these phases at >10% of the Crab Nebula flux. During the two year span of observations, a large amount of X-ray data were also accrued on LS I +61 303 by the Swift X-ray Telescope (XRT) and the Rossi X-ray Timing Explorer Timing (RXTE) Proportional Counter Array (PCA). We find no evidence for a correlation between emission in the X-ray and TeV regimes during 20 directly overlapping observations. We also comment on data obtained contemporaneously by the Fermi Large Area Telescope (LAT)., Accepted for Publication in The Astrophysical Journal, 21 pages, 3 tables, 6 figures
Published: 2011

20. Multiwavelength Observations of the very high energy Blazar 1ES2344+514

Author: L. Ciupik, E. Aliu, R. Dickherber, P. Kaaret, R. Guenette, B. Zitzer, J. E. Ward, Gernot Maier, S. P. Swordy, A. Varlotta, S. P. Wakely, D. Boltuch, A. N. Otte, D. S. Hanna, T. C. Arlen, A. Imran, Daniel Gall, Amanda Weinstein, A. Cannon, Thomas Brian Humensky, P. Cogan, M. Schroedter, Lucy Fortson, R. A. Ong, F. Krennrich, Matthew Wood, D. Pandel, Vladimir Vassiliev, Pierre Colin, S. LeBohec, J. S. Perkins, K. Ragan, M. Theiling, Henric Krawczynski, A. Konopelko, J. P. Finley, A. W. Smith, Amy Furniss, Reshmi Mukherjee, Matthias Beilicke, J. A. Toner, T. C. Weekes, Martin Pohl, G. H. Sembroski, A. D. Falcone, P. Moriarty, John Kildea, Stephanie Wissel, David Kieda, T. Weisgarber, J. Grube, Jamie Holder, P. T. Reynolds, Rick Wagner, S. Vincent, David A. Williams, C. M. Hui, Wystan Benbow, Geza Gyuk, V. Bugaev, V. A. Acciari, P. Fortin, H. J. Rose, S. J. Fegan, D. Steele, M. J. Lang, A. Pichel, T. Aune, N. Karlsson, John L. Quinn, D. Horan, M. Kertzman, and G. H. Gillanders
Subjects: Photon, Ciencias Físicas, bl-lacertae objects, Astrophysics, 01 natural sciences, Spectral line, law.invention, Telescope, purl.org/becyt/ford/1 [https], law, veritas, 0103 physical sciences, galaxies, strong flares, individual, Blazar, 010303 astronomy & astrophysics, Physics, markarian 501, 1ES 2344+514, 010308 nuclear & particles physics, spectral variability, Astronomy and Astrophysics, purl.org/becyt/ford/1.3 [https], gamma-ray emission, Galaxy, Massless particle, bl lacertae objects: individual (ies 2344+514), radiation, Astronomía, einstein slew survey, Crab Nebula, 13. Climate action, Space and Planetary Science, correlated variability, cherenkov telescopes, BL Lacertae objects, CIENCIAS NATURALES Y EXACTAS, Flare
Abstract: Multiwavelength observations of the high-frequency-peaked blazar 1ES 2344+514 were performed from October 2007 to January 2008. The campaign represents the first contemporanous data on the object at very high energy (VHE, E > 100 GeV) gamma-ray, X-ray, and UV energies. Observations with VERITAS in VHE gamma-rays yield a strong detection of 20 sigmas with 633 excess events in a total exposure of 18.1 hours live-time. A strong VHE gamma-ray flare on December 7, 2007 is measured at F(>300 GeV) = (6.76 ± 0.62) × 10^-11 cm^-2 s^-1 , corresponding to 48% of the Crab Nebula flux. Excluding this flaring episode, nightly variability at lower fluxes is observed with a time-averaged mean of F(>300 GeV) = (1.06 ± 0.09) × 10^-11 cm^-2 s^-1 (7.6% of the Crab Nebula flux). The differential photon spectrum between 390 GeV and 8.3 TeV for the time-averaged observations excluding December 7, 2007 is well described by a power law with a photon index of 2.78 ± 0.09 (stat) ± 0.15 (syst). A slightly harder photon index of 2.43 ± 0.22stat ± 0.15syst is measured on the flaring night of December 7, 2007. Over the full period of VERITAS observations contemporaneous X-ray and UV data were taken with Swift and RXTE. Variability by a factor of ~7 is evident in the 2-10 keV flux between nightly observations. On December 8, 2007 the highest ever observed X-ray flux from 1ES 2344+514 was measured by Swift XRT at a flux of F(2-10 keV) = (6.58 ± 0.37) × 10^-11 erg cm^-2 s^-1. Evidence for a correlation between the X-ray flux and VHE gamma-ray flux on nightly time-scales is indicated with a Pearson correlation coefficient of r = 0.60 ± 0.11. Contemporaneous spectral energy distributions (SEDs) of 1ES 2344+514 are presented for two distinct flux states. A one-zone synchrotron self-Compton (SSC) model describes both SEDs using parameters consistent with previous SSC modeling of 1ES 2344+514 from non-contemporaneous observations. Fil: Acciari, V. A.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos Fil: Aliu, E.. University of Delaware; Estados Unidos Fil: Arlen, T.. University of California; Estados Unidos Fil: Aune, T.. University of California; Estados Unidos Fil: Beilicke, M.. University of Washington; Estados Unidos Fil: Benbow, W.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos Fil: Boltuch, D.. University of Delaware; Estados Unidos Fil: Bugaev, V.. University of Washington; Estados Unidos Fil: Cannon, A.. University College Dublin; Irlanda Fil: Ciupik, L.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Cogan, P.. McGill University; Canadá Fil: Colin, P.. University of Utah; Estados Unidos Fil: Dickherber, R.. University of Washington; Estados Unidos Fil: Falcone, A.. University of Pennsylvania; Estados Unidos Fil: Fegan, S. J.. University of California; Estados Unidos Fil: Finley, J. P.. Purdue University; Estados Unidos Fil: Fortin, P.. Columbia University; Estados Unidos Fil: Fortson, L. F.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Furniss, A.. University of California; Estados Unidos Fil: Gall, D.. Purdue University; Estados Unidos Fil: Gillanders, G. H.. National University of Ireland; Irlanda Fil: Grube, J.. University College Dublin; Irlanda Fil: Guenette, R.. McGill University; Canadá Fil: Gyup, G.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Hanna, D.. McGill University; Canadá Fil: Holder, J.. University of Delaware; Estados Unidos Fil: Horan, D.. Ecole Polytechnique; Francia Fil: Hui, C. M.. University of Utah; Estados Unidos Fil: Humensky, T. B.. University Of Chicago; Estados Unidos Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Published: 2011

21. The BigBOSS Experiment

Author: Timothy M. Heckman, D. H. Weinberg, Saul Perlmutter, Jeffrey A. Newman, S. LeBohec, Peter Nugent, Brice Ménard, D. Eppelle, Jason X. Prochaska, S. R. Majewski, X. Yang., Michael Schubnell, C. Schimd, David Kieda, H. Heetderks, Javier Sánchez, Ch Yèche, M. Azzaro, M. E. Levi, P. Jelinsky, Chong H. Ahn, Nick Mostek, P. Doel, U. Seljak, Alex G. Kim, Antonio D. Montero-Dorta, M. L. Lampton, C. Tao, Natalie A. Roe, Celine Peroux, H. T. Diehl, Sheila G. Bailey, Benjamin C. Bromley, C. Magneville, G. Rudnick, Dragan Huterer, C. Frenk, R. Mccloskey, O. Lahav, Anne Ealet, C. Allende Prieto, N. Palanque-Delabrouille, David J. Schlegel, R. N. Cahn, Anze Slosar, Marla Geha, J. Annis, H. Lim, Thomas Matheson, D. W. Gerdes, S. Becerril, Will J. Percival, I. Morales, Jordi Miralda-Escudé, J. Tinker, M. Liang, Kevin Reil, Alexander S. Szalay, F. B. Abdalla, M. Wood-Vasey, Marina Cortês, M. R. Blanton, C. Li, P. H. Carton, Nadia L. Zakamska, J. Yang, F. Valdes, W. Springer, Éric Aubourg, W. Lin, A. de la Macorra, N. Ross, Arthur Kosowsky, Steve Kent, Inese I. Ivans, C. Baltay, August E. Evrard, I. Park, Pengjie Zhang, Maryam Modjaz, Nikhil Padmanabhan, Mark Dickinson, Dick Joyce, Bruce Grossan, Michael Sholl, Francisco Prada, V. Le Brun, Chris Bebek, O. Ilbert, D. Sawyer, Kyle Dawson, D. S. Smith, John A. Peacock, Martin White, C. Marinoni, Emmanuel Rollinde, Andrew R. Zentner, R. Scoccimaro, L. Faccioli, Vicent J. Martínez, Jeff McMahon, K. Honscheid, K. A. G. Olsen, P. Petitjean, George F. Smoot, Patrick McDonald, Wolfgang Lorenzon, Roger F. Malina, Y. Jing, G. Tarle, Y. Chu, B. A. Weaver, Stephanie Escoffier, Eric Prieto, Hee-Jong Seo, Arjun Dey, Jerry Edelstein, Erin Sheldon, Antonio González-Arroyo, Adam S. Bolton, C. M. Rockosi, A. Roodman, Carlton M. Baugh, Tinggui Wang, J. P. Kneib, R. Nichol, C. Zhai, K. Krishnan, V. Ruhlmann-Kleider, Eric V. Linder, A. Stril, P. Gondolo, Timothy A. McKay, Jorge L. Cervantes-Cota, R. Shulte-Ladbeck, J. Wang, Tony Abraham, A. Tilquin, C. Kim, Shirley Ho, Xu Kong, R. D. Kennedy, E. N. Taylor, APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Centre de Physique Théorique - UMR 6207 (CPT), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Cristofol, Danielle, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU)
Subjects: Physics, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], 010308 nuclear & particles physics, Dark matter, Astronomy, Quasar, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Redshift survey, 01 natural sciences, 7. Clean energy, Redshift, Galaxy, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Redshift-space distortions, [SDU.ASTR.IM] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], 13. Climate action, 0103 physical sciences, Dark energy, Baryon acoustic oscillations, [PHYS.ASTR.IM] Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: This report is based on the BigBOSS proposal submission to NOAO in October 2010, and reflects the project status at that time with minor updates; BigBOSS is a Stage IV ground-based dark energy experiment to study baryon acoustic oscillations (BAO) and the growth of structure with a wide-area galaxy and quasar redshift survey over 14,000 square degrees. It has been conditionally accepted by NOAO in response to a call for major new instrumentation and a high-impact science program for the 4-m Mayall telescope at Kitt Peak. The BigBOSS instrument is a robotically-actuated, fiber-fed spectrograph capable of taking 5000 simultaneous spectra over a wavelength range from 340 nm to 1060 nm, with a resolution R = 3000-4800. Using data from imaging surveys that are already underway, spectroscopic targets are selected that trace the underlying dark matter distribution. In particular, targets include luminous red galaxies (LRGs) up to z = 1.0, extending the BOSS LRG survey in both redshift and survey area. To probe the universe out to even higher redshift, BigBOSS will target bright [OII] emission line galaxies (ELGs) up to z = 1.7. In total, 20 million galaxy redshifts are obtained to measure the BAO feature, trace the matter power spectrum at smaller scales, and detect redshift space distortions. BigBOSS will provide additional constraints on early dark energy and on the curvature of the universe by measuring the Ly-alpha forest in the spectra of over 600,000 2.2 < z < 3.5 quasars. BigBOSS galaxy BAO measurements combined with an analysis of the broadband power, including the Ly-alpha forest in BigBOSS quasar spectra, achieves a FOM of 395 with Planck plus Stage III priors. This FOM is based on conservative assumptions for the analysis of broad band power (kmax = 0.15), and could grow to over 600 if current work allows us to push the analysis to higher wave numbers (kmax = 0.3). BigBOSS will also place constraints on theories of modified gravity and inflation, and will measure the sum of neutrino masses to 0.024 eV accuracy.
Published: 2011

22. Erratum: 'multi-wavelength observations of the flaring gamma-ray blazar 3c 66a in 2008 october' (2011, apj, 726, 43)

Author: Luca Baldini, Reshmi Mukherjee, Carla Buemi, I. de la Calle Perez, A. Varlotta, Wystan Benbow, Mn Mazziotta, Jamie Holder, J. P. Norris, A. Morselli, A. D. Falcone, V. Vitale, Henric Krawczynski, T. A. Porter, Takaaki Tanaka, J. Bregeon, P. Kaaret, Stefano Ciprini, David Sanchez, A. Bouvier, Keith Bechtol, J. M. Lopez, Stephen Fegan, P. D. Smith, J. Grube, A. Cannon, R. Turchetti, Manel Errando, Sang Hun Lee, Igor V. Moskalenko, D. Dumora, J. Mehault, T. Aune, J. Lande, J. E. Ward, F. Gargano, D. Pandel, T. Glanzman, P. Calcidese, S. M. Bradbury, A. Berduygin, Marco Ajello, Jun Kataoka, Olaf Reimer, Paul J. Wang, Mauro Dolci, T. Ylinen, D. Capezzali, Vladimir A. Hagen-Thorn, Seth Digel, H. Y. Hsiao, S. Buson, H. F.W. Sadrozinski, V. Bugaev, R. Bellazzini, V. A. Acciari, S. P. Swordy, J. Saino, G. Tešić, Steven Ritz, F. Piron, D. Parent, Vladimir Vassiliev, Luca Latronico, Julie McEnery, Benoit Lott, Anne Lähteenmäki, A. S. Johnson, S. Cutini, A. Konopelko, Joachim Ripken, Ekaterina Koptelova, Brian L Winer, Martin Pohl, Kari Nilsson, G. Tosti, P. L. Nolan, N. Gehrels, Uwe Bach, Corrado Trigilio, Wen Ping Chen, J. M. Casandjian, Geza Gyuk, S. Rainò, K. Ragan, A. McCann, Roger W. Romani, P. Moriarty, Gernot Maier, Karen Byrum, A. Chekhtman, Michele Fumagalli, D. Boltuch, Talvikki Hovatta, A. N. Otte, D. J. Suson, G. H. Sembroski, A. A. Moiseev, M. Pepe, M. G. Nikolashvili, A. Sievers, Ivan Agudo, D. Carosati, Deborah Dultzin, R. Dickherber, C. M. Raiteri, S. P. Wakely, D. Riquelme, Daniel Gall, Cullen H. Blake, M. Schroedter, R. A. Ong, B. Berenji, S. McArthur, Raúl Mújica, M. Razzano, T. L. Usher, Ryosuke Itoh, M. J. Lang, C. C. Cheung, M. Sorcia, D. da Rio, David S. Davis, G.L. Godfrey, J. F. Ormes, E. Do Couto E Silva, Lars Fuhrmann, E. Cavazzuti, Mark Gurwell, G. Umana, P. Spinelli, L. O. Takalo, Francesco Longo, Mar Roca-Sogorb, Claudia Cecchi, Hugh D. Aller, Atsushi Okumura, S. Thibadeau, Richard Dubois, L. A. Sigua, Elina Lindfors, J. S. Perkins, Melissa Pesce-Rollins, Markus Böttcher, A. C. Sadun, N. Karlsson, G. H. Gillanders, S. Godambe, David Hiriart, L. Ciupik, J. H. Panetta, C. Diltz, Merja Tornikoski, Tyrel J. Johnson, Tsunefumi Mizuno, Jason X. Prochaska, R. A. Cameron, Omer Celik, C. M. Hui, F. Loparco, W. N. Johnson, Charles D. Dermer, N. Galante, Diego F. Torres, E. Forné, S. LeBohec, Lucy Fortson, C. Monte, Rumen Bachev, Matthew Wood, M. Pasanen, M. McCutcheon, E. Charles, Jochen Heidt, S. Carrigan, Amy Furniss, P. Bruel, A. Tramacere, G. Demet Senturk, F. de Palma, H. Ungerechts, Stephan Wagner, G. Finnegan, A. W. Smith, Stefan Funk, O. M. Kurtanidze, M. Ziegler, José L. Gómez, Gloria Spandre, J. G. Thayer, A. Halkola, D. Hadasch, James Chiang, A. Sander, M. F. Aller, J. E. Grove, P. Roustazadeh, D. Horan, Roger Blandford, Zhenwei Yang, P. T. Reynolds, Hideaki Katagiri, E. Roache, Carmelo Sgrò, Riccardo Rando, Gianpiero Tagliaferri, E. Hays, David Kieda, Yasushi Fukazawa, David A. Williams, Amanda Weinstein, N. Vilchez, R. Guenette, Hiromitsu Takahashi, J. H. Buckley, M. Kertzman, R. Ligustri, Markus Ackermann, E. Nuss, M. S. Shaw, David Paneque, E. Aliu, P. Fortin, H. J. Rose, T. Kamae, M. Roth, M. Kuss, Erika Benítez, Emmanouil Angelakis, Jürgen Knödlseder, A. W. Borgland, Nicola Omodei, P. Fusco, F. Krennrich, Valeri M. Larionov, P. Lubrano, M. Hayashida, A. A. Abdo, E. Orlando, N. Palma, J. Ballet, A. Cesarini, D. Starr, Tatiana S. Konstantinova, G. N. Kimeridze, M. Theiling, I. Nestoras, S. Vincent, J. Dashti, Josh Bloom, Jan Conrad, S. Germani, R. Buehler, R. E. Hughes, F. Giordano, Alan P. Marscher, J. P. Finley, John L. Quinn, Luis C. Reyes, Peter F. Michelson, Marcello Giroletti, Emanuele Bonamente, A. Reimer, A. Pichel, P. Giommi, J. A. Ros, D. Steele, M. Ozaki, T. C. Weekes, D. J. Thompson, M. Hauser, Johann Cohen-Tanugi, R. Claus, A. Sillanää, M. S. Strickman, P. Beltrame, Tomaso Belloni, G. A. Caliandro, L. Guillemot, A. A. Arkharov, M. Naumann-Godo, A. P. Waite, Jeffrey D. Scargle, Marco Frailis, K. S. Wood, V. Vasileiou, D. Gasparrini, T. Ohsugi, Paolo Leto, M. Brigida, A. Brez, A. Di Paola, V. Pelassa, Nicola Giglietto, I. A. Grenier, D. S. Hanna, S. G. Jorstad, T. C. Arlen, A. Imran, L. Costamante, M. N. Lovellette, Stephanie Wissel, P. A. Caraveo, Persis S. Drell, Gudlaugur Johannesson, M. Villata, Michael Mommert, Justin Vandenbroucke, T. Weisgarber, Guido Barbiellini, Takeshi Nakamori, Thomas Brian Humensky, E. N. Kopatskaya, Matthias Beilicke, L. Tibaldo, Wei Cui, A. Makeev, M. E. Monzani, C. Favuzzi, Jodi Christiansen, J. B. Thayer, J. A. Zensus, S. Murgia, Denis Bastieri, and Sylvain Guiriec
Subjects: Physics, Space and Planetary Science, Gamma ray, Astronomy, Astronomy and Astrophysics, Multi wavelength, Astrophysics, Blazar
Published: 2011

23. Erratum: 'veritas observations of a very high energy γ-ray flare from the blazar 3c 66a' (2009, apj, 693, l104)

Author: A. Varlotta, John Kildea, M. J. Lang, M. Beilicke, Wystan Benbow, Henric Krawczynski, R. G. Wagner, J. P. Finley, Lucy Fortson, Matthew Wood, A. Cannon, Martin Pohl, G. H. Sembroski, D. Pandel, Yousaf M. Butt, J. A. Toner, N. Karlsson, M. McCutcheon, A. McCann, C. M. Hui, T. C. Weekes, R. Dickherber, P. Moriarty, E. Hays, J. Grube, L. Ciupik, J. S. Perkins, Thomas Brian Humensky, V. Bugaev, V. A. Acciari, Stephanie Wissel, Geza Gyuk, David A. Williams, E. Aliu, Y. C. Chow, Reshmi Mukherjee, D. Horan, Amanda Weinstein, David Kieda, R. Guenette, M. K. Daniel, R. A. Ong, M. Kertzman, D. Petry, B. Zitzer, Gernot Maier, K. Ragan, S. M. Bradbury, P. Fortin, H. J. Rose, A. Konopelko, Markus Böttcher, S. LeBohec, P. Kaaret, S. P. Wakely, G. H. Gillanders, S. Godambe, S. P. Swordy, S. J. Fegan, Daniel Gall, O. Celik, D. Steele, F. Pizlo, Karen Byrum, D. S. Hanna, T. C. Arlen, M. Schroedter, A. Imran, Jamie Holder, J. E. Ward, Wei Cui, A. Cesarini, A. N. Otte, John L. Quinn, A. W. Smith, J. Millis, K. G. Gibbs, E. Roache, A. D. Falcone, P. Cogan, Luis C. Reyes, Vladimir Vassiliev, Amy Furniss, Tulun Ergin, F. Krennrich, M. Theiling, J. H. Buckley, P. T. Reynolds, and T. Nagai
Subjects: Physics, High energy, Space and Planetary Science, law, Astronomy, Astronomy and Astrophysics, Astrophysics, Blazar, Flare, law.invention
Published: 2010

24. Two-dimensional image recovery in intensity interferometry using the Cauchy-Riemann relations

Author: Richard B. Holmes, Paul D. Nuñez, and S. LeBohec
Subjects: Synthetic aperture radar, Image quality, business.industry, Interferometry, symbols.namesake, Fourier transform, symbols, Computer vision, Artificial intelligence, Image sensor, Phase retrieval, business, Algorithm, Image resolution, Image restoration
Abstract: Intensity interferometry utilizes measurements of the squared-magnitude of the Fourier transform of an object using relatively simple, phase-insensitive hardware, and therefore holds the promise of extremely high spatial resolution in astronomy and various branches of physics. However, this promise has not been realized due to signal-noise-ratio (SNR) issues and due to the maturity of image recovery algorithms. To recover an image, the phase of the Fourier transform must be determined in addition to its magnitude. In a recent paper, relatively good one-dimensional (1-D) image recoveries were obtained with a fast non-iterative algorithm utilizing the Cauchy-Riemann relations and a mild constraint on the symmetry of the object. In this paper, the approach is extended to two spatial dimensions by combining multiple 1-D reconstructions, and ensuring mutual consistency between 1-D slices. Mutual consistency is enforced using several different approaches, including phase retrieval. This use of the Cauchy-Riemann approach combined with imposition of mutual consistency is found to reduce noise sensitivity significantly. Three approaches are evaluated for image quality for different objects using sparse Fourier-plane sampling, showing good reconstruction of images at SNR's as low as 7 at the origin in the Fourier plane (and thus even lower SNR's at higher angular frequencies).
Published: 2010

25. Discovery of very high energy γ-ray emission from the snr g54.1+0.3

Author: A. McCann, R. A. Ong, Thomas Weisgarber, S. LeBohec, Gernot Maier, M. Beilicke, N. Karlsson, S. P. Wakely, Daniel Gall, S. M. Bradbury, G. Demet Senturk, D. Pandel, R. Dickherber, S. Thibadeau, T. B. Humensky, D. Boltuch, D. Steele, J. E. Ward, T. Aune, Geza Gyuk, B. Zitzer, S. McArthur, J. Grube, R. Guenette, L. Ciupik, V. A. Acciari, Jamie Holder, C. M. Hui, A. Furniss, E. Aliu, H. Krawczynski, G. H. Gillanders, F. Krennrich, S. Godambe, M. McCutcheon, A. Cesarini, P. Kaaret, S. P. Swordy, John L. Quinn, G. H. Sembroski, M. Bautista, R. Muhkerjee, K. Ragan, Y. Butt, G. Těsić, M. Theiling, A. Konopelko, Wystan Benbow, L. C. Reyes, M. Schroedter, Stephanie Wissel, S. Vincent, E. Roache, H. J. Rose, T. Arlen, Patrick Slane, J. H. Buckley, M. Kertzman, A. N. Otte, Matthew J.A. Wood, J. P. Finley, T. C. Weekes, M. J. Lang, Eric V. Gotthelf, David Kieda, A. Imran, David A. Williams, G. Finnegan, A. W. Smith, C. Duke, V. V. Vassiliev, P. Moriarty, Nicola Galante, D. S. Hanna, V. Bugaev, J. S. Perkins, Wei Cui, A. J.R. Weinstein, K. Byrum, P. T. Reynolds, Lucy Fortson, and Martin Pohl
Subjects: supernova remnant g54.1+0.3, catalog, Photon, Astrophysics::High Energy Astrophysical Phenomena, Flux, Astrophysics, pulsar wind nebulae, telescope, 01 natural sciences, g0.9+0.1, Luminosity, Pulsar, Observatory, veritas, 0103 physical sciences, crab-nebula, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, search, 010308 nuclear & particles physics, Resolution (electron density), Gamma ray, Astronomy and Astrophysics, gamma rays: general, pulsars: individual (j1930+1852, j1928+1746), astronomy, Crab Nebula, 13. Climate action, Space and Planetary Science, ism: supernova remnants, ddc:520, High Energy Physics::Experiment
Abstract: We report the discovery of very high energy (VHE) gamma-ray emission from the direction of the SNR G54.1+ 0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8s and appears pointlike given the resolution of the instrument. The integral flux above 1 TeV is 2.5% of the Crab Nebula flux and significant emission is measured between 250 GeV and 4 TeV, well described by a power-law energy spectrum dN/dE similar to E(-Gamma) with a photon index Gamma = 2.39 +/- 0.23(stat) +/- 0.30sys. We find no evidence of time variability among observations spanning almost two years. Based on the location, the morphology, the measured spectrum, the lack of variability, and a comparison with similar systems previously detected in the TeV band, the most likely counterpart of this new VHE gamma-ray source is the pulsar wind nebula (PWN) in the SNR G54.1+0.3. The measured X-ray to VHE gamma-ray luminosity ratio is the lowest among all the nebulae supposedly driven by young rotation-powered pulsars, which could indicate a particle-dominated PWN.
Published: 2010

26. Veritas upper limit on the very high energy emission from the radio galaxy NGC 1275

Author: V. A. Acciari, E. Aliu, T. Arlen, T. Aune, M. Bautista, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, O. Celik, A. Cesarini, L. Ciupik, P. Cogan, W. Cui, R. Dickherber, C. Duke, S. J. Fegan, J. P. Finley, P. Fortin, L. Fortson, A. Furniss, N. Galante, D. Gall, K. Gibbs, G. H. Gillanders, S. Godambe, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, M. Pohl, J. Quinn, K. Ragan, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, M. Theiling, J. A. Toner, A. Varlotta, V. V. Vassiliev, S. Vincent, R. G. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, S. Wissel, M. Wood, B. Zitzer, J. Kataoka, E. Cavazzuti, C. C. Cheung, B. Lott, D. J. Thompson, G. Tosti, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: jets, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Active galactic nucleus, Radio galaxy, Perseus A), Astrophysics::High Energy Astrophysical Phenomena, Flux, proton blazar, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, galaxies: individual: NGC 1275 3C 84 Perseus A, Telescope, atmospheric cherenkov telescopes, Spitzer Space Telescope, law, 0103 physical sciences, 3C 84, Limit (mathematics), galaxies: Seyfert, gamma rays: observations, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, parameters, 010308 nuclear & particles physics, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], galaxies: individual (NGC 1275, Astronomy and Astrophysics, gamma-ray emission, galaxies: individual (ngc 1275, 3c 84, perseus a), radiation, Crab Nebula, Space and Planetary Science, markarian-501, active galactic nuclei, peaked bl-lacertae, discovery, Fermi Gamma-ray Space Telescope
Abstract: The recent detection by the Fermi gamma-ray space telescope of high-energy gamma-rays from the radio galaxy NGC 1275 makes the observation of the very high energy (VHE: E > 100 GeV) part of its broadband spectrum particularly interesting, especially for the understanding of active galactic nuclei (AGN) with misaligned multi-structured jets. The radio galaxy NGC 1275 was recently observed by VERITAS at energies above 100 GeV for about 8 hours. No VHE gamma-ray emission was detected by VERITAS from NGC 1275. A 99% confidence level upper limit of 2.1% of the Crab Nebula flux level is obtained at the decorrelation energy of approximately 340 GeV, corresponding to 19% of the power-law extrapolation of the Fermi Large Area Telescope (LAT) result.
Published: 2009

27. A connection between star formation activity and cosmic rays in the starburst galaxy M82

Author: V. A. Acciari, M. J. Lang, A. Cesarini, Pierre Colin, John L. Quinn, L. C. Reyes, K. G. Gibbs, R. Guenette, J. E. Ward, A. N. Otte, Frank Krennrich, A. McCann, S. P. Swordy, R. Dickherber, T. Aune, Karen Byrum, T. Weisgarber, S. Thibadeau, M. Theiling, G. H. Gillanders, S. Godambe, Philip Kaaret, M. Schroedter, D. S. Hanna, T. C. Arlen, A. Imran, S. M. Bradbury, Wystan Benbow, J. Millis, Reshmi Mukherjee, F. Pizlo, S. J. Fegan, M. Beilicke, John Kildea, D. Steele, N. Karlsson, M. McCutcheon, David A. Williams, P. Moriarty, Gernot Maier, A. Cannon, Stephanie Wissel, D. Pandel, S. P. Wakely, Daniel Gall, D. Boltuch, J. H. Buckley, N. Galante, R. A. Ong, S. LeBohec, P. Cogan, G. Finnegan, A. W. Smith, David Kieda, Vladimir Vassiliev, C. Duke, Wei Cui, E. Roache, Thomas Brian Humensky, Jamie Holder, Lucy Fortson, Matthew Wood, V. Bugaev, S. McArthur, L. Ciupik, Amy Furniss, Geza Gyuk, E. Aliu, A. Varlotta, B. Zitzer, J. S. Perkins, K. Ragan, A. Konopelko, Martin Pohl, G. H. Sembroski, Henric Krawczynski, T. Nagai, R. G. Wagner, C. M. Hui, D. Horan, M. Kertzman, J. Grube, J. P. Finley, T. C. Weekes, P. T. Reynolds, S. Vincent, Y. C. Chow, O. Celik, Manuel A. Bautista, Amanda Weinstein, P. Fortin, and H. J. Rose
Subjects: Physics, High rate, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Multidisciplinary, 010308 nuclear & particles physics, Star formation, Protogalaxy, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Radiation, 01 natural sciences, Galaxy, Supernova, Stars, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Although Galactic cosmic rays (protons and nuclei) are widely believed to be dominantly accelerated by the winds and supernovae of massive stars, definitive evidence of this origin remains elusive nearly a century after their discovery [1]. The active regions of starburst galaxies have exceptionally high rates of star formation, and their large size, more than 50 times the diameter of similar Galactic regions, uniquely enables reliable calorimetric measurements of their potentially high cosmic-ray density [2]. The cosmic rays produced in the formation, life, and death of their massive stars are expected to eventually produce diffuse gamma-ray emission via their interactions with interstellar gas and radiation. M 82, the prototype small starburst galaxy, is predicted to be the brightest starburst galaxy in gamma rays [3, 4]. Here we report the detection of >700 GeV gamma rays from M 82. From these data we determine a cosmic-ray density of 250 eV cm-3 in the starburst core of M 82, or about 500 times the average Galactic density. This result strongly supports that cosmic-ray acceleration is tied to star formation activity, and that supernovae and massive-star winds are the dominant accelerators., 18 pages, 4 figures; published in Nature; Version is prior to Nature's in-house style editing (differences are minimal)
Published: 2009

28. Section on prospects for dark matter detection of the white paper on the status and future of ground-based TeV gamma-ray astronomy

Author: K. Byrum, D. Horan, T. Tait, R. Wanger, G. Zaharijas, J. Buckley, E. A. Baltz, G. Bertone, B. Dingus, S. Fegan, F. Ferrer, P. Gondolo, J. Hall, D. Hooper, S. Koushiappas, H. Krawczynksi, S. LeBohec, M. Pohl, S. Profumo, J Silk, V. Vassilev, M. Wood, S. Wakely, null FNAL, null Insti. d' Astrophysique, and null LANL
Subjects: Physics, White paper, WIMP, Astrophysics::High Energy Astrophysical Phenomena, Neutralino, Dark matter, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Gamma-ray astronomy, Halo, Astrophysics, Gamma-ray burst, Galaxy
Abstract: This is a report on the findings of the dark matter science working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper was commissioned by the American Physical Society, and the full white paper can be found on astro-ph (arXiv:0810.0444). This detailed section discusses the prospects for dark matter detection with future gamma-ray experiments, and the complementarity of gamma-ray measurements with other indirect, direct or accelerator-based searches. We conclude that any comprehensive search for dark matter should include gamma-ray observations, both to identify the dark matter particle (through the characteristics of the gamma-ray spectrum) and to measure the distribution of dark matter in galactic halos.
Published: 2009

29. VERITAS OBSERVATIONS OF THE BL LAC OBJECT 1ES 1218+304

Author: John Kildea, P. Kaaret, T. Nagai, Rick Wagner, L. C. Reyes, Y. C. K. Chow, O. Celik, M. J. Lang, Tulun Ergin, V. Bugaev, John Toner, A. McCann, D. Horan, Geza Gyuk, J. E. Ward, Amy Furniss, R. Guenette, Martin Pohl, S. J. Fegan, D. Steele, A. Konopelko, D. S. Hanna, D. Pandel, V. A. Acciari, Pierre Colin, Wystan Benbow, A. W. Smith, Jacek Niemiec, J. P. Finley, M. K. Daniel, P. T. Reynolds, Gernot Maier, T. C. Weekes, P. Cogan, S. P. Wakely, R. Mukherjee, S. P. Swordy, G. H. Gillanders, H. J. Rose, M. Schroedter, R. J. White, Lucy Fortson, Matthew Wood, T. B. Humensky, Wei Cui, Abraham D. Falcone, E. Hays, L. Valcarcel, A. Cesarini, Stephanie Wissel, John L. Quinn, Karen Byrum, N. Karlsson, C. M. Hui, David Kieda, V. V. Vassiliev, M. McCutcheon, P. Moriarty, M. Kertzman, M. Beilicke, J. S. Perkins, T. Arlen, P. Fortin, F. Krennrich, Henric Krawczynski, A. Imran, J. H. Buckley, David A. Williams, K. Ragan, Y. Butt, J. Grube, Jamie Holder, L. Ciupik, E. Aliu, B. Zitzer, S. M. Bradbury, A. Weinstein, G. H. Sembroski, R. A. Ong, and S. LeBohec
Subjects: extragalactic background light, Active galactic nucleus, radiation-fields, spectra, galaxies: active, Astrophysics, telescope, energy gamma-rays, emission, MAGIC (telescope), Blazar, Physics, bl lacertae objects: individual (1es 1218+304), tev blazars, hess, Astronomy, Astronomy and Astrophysics, Light curve, Redshift, Crab Nebula, x-ray, Extragalactic background light, Space and Planetary Science, gamma rays: observations, discovery, BL Lac object
Abstract: The VERITAS collaboration reports the detection of very-high-energy gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z = 0.182. A gamma-ray signal was detected with a statistical significance of 10.4 standard deviations (10.4 sigma) for the observations taken during the first three months of 2007, confirming the discovery of this object made by the MAGIC collaboration. The photon spectrum between similar to 160 GeV and similar to 1.8 TeV is well described by a power law with an index of Gamma = 3.08 +/- 0.34(stat) +/- 0.2(sys). The integral flux is Phi (E > 200 GeV) = (12.2 +/- 2.6) x 10(-12) cm(-2) s(-1), which corresponds to similar to 6% of that of the Crab Nebula. The light curve does not show any evidence for very high energy flux variability. Using lower limits on the density of the extragalactic background light in the near to mid-infrared, we are able to limit the range of intrinsic energy spectra for 1ES 1218+304. We show that the intrinsic photon spectrum has an index that is harder than Gamma = 2.32 +/- 0.37(stat). When including constraints from the spectra of 1ES 1101-232 and 1ES 0229+200, the spectrum of 1ES 1218+ 304 is likely to be harder than Gamma = 1.86 +/- 0.37(stat).
Published: 2009

30. Observation of gamma‐ray emission from the galaxy m87 above 250 gev with veritas1

Author: V. A. Acciari, M. Beilicke, G. Blaylock, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. K. Daniel, C. Duke, T. Ergin, A. D. Falcone, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, L. F. Fortson, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, S. B. Hughes, M. C. Hui, T. B. Humensky, A. Imran, P. Kaaret, M. Kertzman, D. B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R. A. Ong, D. Pandel, J. S. Perkins, M. Pohl, J. Quinn, K. Ragan, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, A. Syson, J. A. Toner, L. Valcarcel, V. V. Vassiliev, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. D. Wood, and B. Zitzer
Subjects: unified schemes, Active galactic nucleus, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies : individual (m87, ngc 4486, virgo a), 01 natural sciences, Observatory, jet, 0103 physical sciences, gamma rays : observations, crab-nebula, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, tev emission, 010308 nuclear & particles physics, variability, Gamma ray, telescope observations, Astronomy and Astrophysics, Radius, Cherenkov Telescope Array, lac objects, Galaxy, x-ray, 13. Climate action, Space and Planetary Science, markarian-421, High Energy Physics::Experiment, Radio wave, supermassive black-hole
Abstract: The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in Active Galactic Nuclei from radio waves to TeV gamma-rays. Here we report the detection of gamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cherenkov telescope array and discuss its correlation with the X-ray emission. The gamma-ray emission is measured to be point-like with an intrinsic source radius less than 4.5 arcmin. The differential energy spectrum is fitted well by a power-law function: dPhi/dE=(7.4+-1.3_{stat}+-1.5_{sys})(E/TeV)^{-2.31+-0.17_{stat}+-0.2_{sys}} 10^{-9}m^{-2}s^{-1}TeV^{-1}. We show strong evidence for a year-scale correlation between the gamma-ray flux reported by TeV experiments and the X-ray emission measured by the ASM/RXTE observatory, and discuss the possible short-time-scale variability. These results imply that the gamma-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.
Published: 2008

31. VERITAS Observations of the gamma-Ray Binary LS I +61 303

Author: V. A. Acciari, M. Beilicke, G. Blaylock, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. L. Byrum, O. Celik, A. Cesarini, L. Ciupik, Y. C. K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, C. Duke, T. Ergin, A. D. Falcone, S. J. Fegan, J. P. Finley, P. Fortin, L. F. Fortson, D. Gall, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, D. Hanna, E. Hays, J. Holder, D. Horan, S. B. Hughes, C. M. Hui, T. B. Humensky, P. Kaaret, D. B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R. A. Ong, D. Pandel, J. S. Perkins, F. Pizlo, M. Pohl, J. Quinn, K. Ragan, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, J. A. Toner, L. Valcarcel, V. V. Vassiliev, R. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. Wood, and B. Zitzer
Subjects: catalog, Photon, Astrophysics::High Energy Astrophysical Phenomena, Flux, Binary number, FOS: Physical sciences, Astrophysics, 01 natural sciences, Power law, Standard deviation, spectrum, microquasar ls-i+61-303, ls-i +61-degrees-303, emission, 0103 physical sciences, Energy spectrum, gamma rays : observations, 010303 astronomy & astrophysics, acceleration of particles, Physics, lsi+61-degrees-303, model, 010308 nuclear & particles physics, stars : individual (ls i+61 303), Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, astronomy, modulation, Crab Nebula, Space and Planetary Science, High Energy Physics::Experiment, binaries : general, discovery
Abstract: LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February 2007) with the VERITAS array of imaging air-Cherenkov telescopes. A signal of gamma-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Gamma=2.40+-0.16_stat+-0.2_sys and a flux above 300 GeV corresponding to 15-20% of the flux from the Crab Nebula., Comment: accepted for publication in The Astrophysical Journal
Published: 2008
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32. Site Characteristics of Southern Utah Sites for Astronomical Observatories

Author: P. Gondolo, D. Kieda, S. Lebohec, S. K. Martens, P. Ricketts, R. W. Springer, C. Zimmer, Felix A. Aharonian, Werner Hofmann, and Frank Rieger
Subjects: Telescope, Altitude, Robotic telescope, Geography, Meteorology, Observatory, law, Night sky, Astronomical seeing, IACT, Gamma-ray astronomy, Remote sensing, law.invention
Abstract: The University of Utah has recently begun construction of a new 0.8 m optical/IR robotic telescope to be operated as a regional astronomy resource in the Intermountain West. The new Southern Utah Observatory (SUO) will require a high altitude (>3000 m) site with excellent atmospheric seeing, favorable weather conditions, and nearby infrastructure, including road, power, and high speed internet. We have explored six possible sites for the SUO telescope with favorable climate, night sky darkness and infrastructure. Since spring 2007, we have performed detailed measurements of atmospheric seeing at several of these sites, and have identified the preferred site for the SUO telescope at Frisco Peak, UT. Several large (1 sq. mile) areas of State Trust Land are nearby the new SUO telescope site. These large, flat areas may be excellent sites for large area, next generation Imaging Atmospheric Cherenkov Telescopes (IACT) arrays such as AGIS or northern CTA.
Published: 2008

33. Status of the VERITAS Observatory

Author: J. Holder, V. A. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. L. Byrum, A. Cannon, O. Celik, A. Cesarini, L. Ciupik, Y. C. K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, T. Ergin, A. D. Falcone, S. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, L. F. Fortson, A. Furniss, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, P. Moriarty, R. Mukherjee, T. Nagai, J. Niemiec, R. A. Ong, D. Pandel, J. S. Perkins, M. Pohl, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, J. A. Toner, L. Valcarcel, V. V. Vassiliev, R. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. Wood, B. Zitzer, Felix A. Aharonian, Werner Hofmann, and Frank Rieger
Subjects: Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, IACT, Astrophysics, 01 natural sciences, law.invention, Telescope, Technical performance, Observatory, law, 0103 physical sciences, High Energy Physics::Experiment, 010303 astronomy & astrophysics, Cherenkov radiation, Astrophysics::Galaxy Astrophysics
Abstract: VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical gamma-ray sources have been detected, both galactic and extragalactic, including sources previously unknown at TeV energies. We describe the status of the array and some highlight results, and assess the technical performance, sensitivity and shower reconstruction capabilities., Comment: Submitted to Proceedings of "4th Heidelberg International Symposium on High Energy Gamma-Ray Astronomy 2008"
Published: 2008
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34. Towards micro-arcsecond spatial resolution with Air Cherenkov Telescope arrays as optical intensity interferometers

Author: M. K. Daniel, Jim Hinton, S. LeBohec, Jamie Holder, W. J. de Wit, and R. J. White
Subjects: Physics, History, business.industry, Intensity interferometer, Astrophysics (astro-ph), FOS: Physical sciences, IACT, Astrophysics, Computer Science Applications, Education, law.invention, Telescope, Stars, Interferometry, Optics, law, Astronomical interferometer, business, Image resolution, Cherenkov radiation
Abstract: In this poster contribution we highlight the equivalence between an Imaging Air Cherenkov Telescope (IACT) array and an Intensity Interferometer for a range of technical requirements. We touch on the differences between a Michelson and an Intensity Interferometer and give a brief overview of the current IACT arrays, their upgrades and next generation concepts (CTA, AGIS, completion 2015). The latter are foreseen to include 30-90 telescopes that will provide 400-4000 different baselines that range in length between 50m and a kilometre. Intensity interferometry with such arrays of telescopes attains 50 micro-arcseconds resolution for a limiting V magnitude of ~8.5. This technique opens the possibility of a wide range of studies, amongst others, probing the stellar surface activity and the dynamic AU scale circumstellar environment of stars in various crucial evolutionary stages. Here we discuss possibilities for using IACT arrays as optical Intensity Interferometers., Comment: Appeared in the proceedings of "The Universe under the Microscope - Astrophysics at High Angular Resolution", Journal of Physics:Conference Series (IOP; http://www.iop.org/EJ/toc/1742-6596/131/1)
Published: 2008
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35. Deployment of a Pair of 3 M telescopes in Utah

Author: G. Finnegan, B. Adams, K. Butler, J. Cardoza, P. Colin, C. M. Hui, D. Kieda, D. Kirkwood, D. Kress, M. Kress, S. LeBohec, C. McGuire, M. Newbold, P. Nunez, K. Pham, Felix A. Aharonian, Werner Hofmann, and Frank Rieger
Subjects: Physics, Interferometry, Software deployment, Astrophysics::High Energy Astrophysical Phenomena, Aperture synthesis, Very-long-baseline interferometry, Astrophysics::Instrumentation and Methods for Astrophysics, Aperture masking interferometry, Astronomy, Gamma-ray astronomy, Astronomical telescopes, Cherenkov radiation, Remote sensing
Abstract: Two 3 m telescopes are being installed in Grantsville Utah. They are intended for the testing of various approaches to the implementation of intensity interferometry using Cherenkov Telescopes in large arrays as receivers as well as for the testing of novel technology cameras and electronics for ground based gamma‐ray astronomy.
Published: 2008

36. Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability

Author: Henric Krawczynski, G. H. Sembroski, D. B. Kieda, Y. C. Chow, Dieter Horns, J. P. Finley, R. A. Ong, P. Moriarty, J. Grube, T. C. Weekes, Dirk Petry, S. P. Wakely, S. LeBohec, K. Lee, J. A. Gaidos, Wei Cui, Jamie Holder, I. H. Bond, John L. Quinn, S. M. Bradbury, M. J. Lang, John Kildea, Giovanni Fossati, D. A. Carter-Lewis, A. D. Falcone, M. M. Jordan, D. Horan, F. Krennrich, and J. H. Buckley
Subjects: galaxies : active, Astrophysics::High Energy Astrophysical Phenomena, Population, Flux, Synchrotron radiation, FOS: Physical sciences, tev blazar markarian-421, Astrophysics, bl lacertae objects : individual (mrk 421), ray timing explorer, Luminosity, law.invention, law, emission, evolution, radiation mechanisms : nonthermal, gamma rays : observations, strong flares, Blazar, education, Physics, education.field_of_study, Astrophysics (astro-ph), Compton scattering, HEGRA, Astronomy and Astrophysics, gamma-rays, spectral energy-distributions, galaxies : jets, BL Lacertae objects : individual (Mrk 421), galaxies, jets, X-rays : individual (Mrk 421), Astronomy & Astrophysics, bl-lac objects, Space and Planetary Science, active galactic nuclei, lacertae objects, Flare, x-rays : individual (mrk 421)
Abstract: (Abridged) We present a detailed analysis of week-long simultaneous observations of the blazar Mrk421 at 2-60 keV X-rays (RXTE) and TeV gamma-rays (Whipple and HEGRA) in 2001. The unprecedented quality of this dataset enables us to establish firmly the existence of the correlation between the TeV and X-ray luminosities, and to start unveiling some of its more detailed characteristics, in particular its energy dependence, and time variability. The source shows strong, highly correlated variations in X-ray and gamma-ray. No evidence of X-ray/gamma-ray interband lag is found on the full week dataset (, Correction to authorship. Minor editorial changes to text, figures, references. 22 pages (emulateapj), 12 figures (47 postscript files) Published in ApJ, 2008 April 20 (ADS: 2008ApJ...677..906F)
Published: 2007
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37. The first veritas telescope

Author: Geza Gyuk, A. Milovanovic, Philip Kaaret, F. Krennrich, A. Syson, M. K. Daniel, Gernot Maier, D. A. Carter-Lewis, G. E. Kenny, J. P. Finley, K. Ragan, D. Horan, T. C. Weekes, S. P. Wakely, Y. C. K. Chow, Abraham D. Falcone, C. Duke, R. A. Ong, John Toner, F. Pizlo, R. G. Wagner, H. Manseri, E. Roache, J. Grube, S. LeBohec, S. P. Swordy, P. A. Ogden, Reshmi Mukherjee, Jamie Holder, M. J. Lang, I. Jung, K. J. Gutierrez, R. J. White, John L. Quinn, S. B. Hughes, Henric Krawczynski, P. Moriarty, K. G. Gibbs, S. M. Bradbury, Karen Byrum, G. Sleege, John Kildea, E.K. Little, M. Schroedter, G. Blaylock, J. Hall, J. S. Perkins, David A. Williams, C. Dowdall, P. Fortin, H. J. Rose, P. Cogan, Martin Pohl, R. W. Atkins, J. H. Buckley, P. T. Reynolds, D. Petry, E. Hays, V. V. Vassiliev, David Kieda, Lucy Fortson, Paul Dowkontt, Wei Cui, L. Valcarcel, H. M. Badran, O. J. Glidewell, D. S. Hanna, A. Imran, E. Linton, J. Knapp, I. de la Calle Perez, Thomas Brian Humensky, G. H. Sembroski, G. H. Gillanders, O. Celik, S. J. Fegan, and D. Steele
Subjects: tev gamma-rays, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, FOS: Physical sciences, X-ray telescope, Astrophysics, system, 01 natural sciences, law.invention, spectrum, Telescope, project, law, 0103 physical sciences, Calibration, Astrophysics::Solar and Stellar Astrophysics, crab-nebula, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Cherenkov radiation, gamma ray astronomy, cherenkov telescopes, atmospheric cherenkov telescope, imaging technique, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Cherenkov Telescope Array, Crab Nebula, Astrophysics::Earth and Planetary Astrophysics
Abstract: The first atmospheric Cherenkov telescope of VERITAS (the Very Energetic Radiation Imaging Telescope Array System) has been in operation since February 2005. We present here a technical description of the instrument and a summary of its performance. The calibration methods are described, along with the results of Monte Carlo simulations of the telescope and comparisons between real and simulated data. The analysis of TeV $\gamma$-ray observations of the Crab Nebula, including the reconstructed energy spectrum, is shown to give results consistent with earlier measurements. The telescope is operating as expected and has met or exceeded all design specifications., Comment: Accepted by Astroparticle Physics
Published: 2006

38. A new search for primordial black hole evaporations using the whipple gamma-ray telescope

Author: M. K. Daniel, E. Linton, Gernot Maier, S. P. Wakely, P. Fortin, J. H. Buckley, L. Valcarcel, J. Knapp, John Kildea, John L. Quinn, G. E. Kenny, P. J. Boyle, K. J. Guiterrez, M. J. Lang, K. Ragan, H. M. Badran, I. Jung, R. A. Ong, David Kieda, P. Rebillot, J. Hall, S. LeBohec, Jamie Holder, A. D. Falcone, S. P. Swordy, D. Horan, G. Blaylock, Karen Byrum, J. P. Finley, Martin Pohl, P. Cogan, F. Pizlo, R. W. Atkins, P. Moriarty, Y. C. Chow, G. H. Sembroski, T. C. Weekes, C. Dowdall, M. Kertzman, D. S. Hanna, D. J. Fegan, Thomas Brian Humensky, S. J. Fegan, D. Steele, Jeremy Perkins, Henric Krawczynski, R. J. White, S. B. Hughes, O. Celik, P. T. Reynolds, and D. A. Carter-Lewis
Subjects: Physics, bursts, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, cosmic-rays, Astronomy, Astronomy and Astrophysics, Cosmic ray, Primordial black hole, Astrophysics, gamma ray bursts, black holes, Galaxy, Universe, matter, scale, General Relativity and Quantum Cosmology, Micro black hole, Orders of magnitude (time), Gamma-ray burst, Fermi Gamma-ray Space Telescope, media_common
Abstract: Stephen Hawking's prediction that black holes should radiate like black bodies has several important consequences, including the possibility of the detection of small (similar to 10(15) g) black holes created in the very early universe. The detection of such primordial black holes ( PBHs) would be an important discovery, not only confirming Hawking's theory, but also providing valuable insights into the history of the early universe. A search through 5.5 years of archival data from the Whipple Atmospheric Cerenkov Telescope is made for TeV gamma-ray bursts on 1, 3, and 5 s timescales. On the basis of a null result from this direct search for PBH evaporations, an upper limit of 1.08 x 10(6) pc(-3) yr(-1) (99% CL) is set on the PBH evaporation rate in the local region of the galaxy, assuming the Standard Model of particle physics. This is more than a factor of two better than the previous limit at this energy range and includes longer timescales than have previously been explored. Comparison of this result with previous limits on the fraction of the critical density comprised by PBHs, Omega(pbh), depends strongly on assumptions made about PBH clustering; in models predicting strong PBH clustering, the limit in this work could be as many as ten orders of magnitude more stringently than those set by diffuse MeV gamma-ray observations.
Published: 2006

39. VERITAS: status c.2005

Author: S. M. Bradbury, D. A. Carter-Lewis, S. P. Swordy, K. J. Guitterez, V. V. Vassiliev, M. Schroedter, F. Pizlo, G. E. Kenny, P. A. Ogden, Paul Dowkontt, Reshmi Mukherjee, E. Linton, H. M. Badran, J. Hall, Y. C. Chow, Tony Hall, T. B. Humensky, B. Power-Mooney, P. Fortin, H. J. Rose, Tulun Ergin, I. de la Calle Perez, David R. Williams, Henric Krawczynski, T. N. Nagai, Wei Cui, A. Milovanovic, D. Kiedai, D. S. Hanna, J. S. Perkins, Dirk Petry, John L. Quinn, K. Kosack, K. G. Gibbs, J. Knapp, A. M. Hillas, John Kildea, R. G. Wagner, D. Horan, M. J. Lang, K. L. Bryum, Lucy Fortson, P. T. Reynolds, P. Kaaret, M. K. Daniel, A. D. Falcone, A. Syson, P. J. Boyle, L. Valcarcel, G. H. Gillanders, C. Dowdall, S. Gammell, E. Hays, P. Moriarty, Gernot Maier, J. Grube, J. Lloyd-Evans, D. Steele, R. A. Ong, G. H. Sembroski, H. Manseri, S. P. Wakely, G. Walker, S. LeBohec, C. Duke, J. P. Finley, J. A. Toner, T. C. Weekes, S. B. Hughes, M. Pohl, J. A. Zweerink, K. Ragan, P. Rebillot, M. A. Olevitch, Jamie Holder, Mark N. Quinn, D. J. Fegan, M. Kertzmann, I. H. Bond, S. J. Fegan, P. Cogan, R. W. Atkins, R. J. White, Omer Celik, G. Blaylock, J. H. Buckley, and F. Krennrich
Subjects: Computer science, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Radiation imaging, Astronomy, Cosmic ray, Gamma-ray astronomy, law.invention, Telescope, law, Astrophysics::Solar and Stellar Astrophysics, Astronomical telescopes, Gamma detection, Astrophysics::Galaxy Astrophysics, Cherenkov radiation, Gamma ray detection
Abstract: VERITAS (Very Energetic Radiation Imaging Telescope Array System), is one of a new generation of TeV gamma‐ray observatories. The current status of its construction is described here. The first two telescopes and cameras have been completed and meet the design specifications; the full array of four telescopes could be operational by the end of 2006.
Published: 2006

40. SGARFACE: A Novel Detector For Microsecond Gamma Ray Bursts

Author: S. LeBohec, G. Sleege, and F. Krennrich
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Detector, Gamma ray, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics, Fluence, law.invention, Telescope, Microsecond, Observatory, law, Gamma-ray burst, Cherenkov radiation
Abstract: The Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) is operated at the Whipple Observatory utilizing the Whipple 10m gamma-ray telescope. SGARFACE is sensitive to gamma-ray bursts of more than 100MeV with durations from 100ns to 35us and provides a fluence sensitivity as low as 0.8 gamma-rays per m^2 above 200MeV (0.05 gamma-rays per m^2 above 2GeV) and allows to record the burst time structure., 29 pages, 14 figures, accepted for publication in Astroparticle Physics
Published: 2005

41. Search for High Energy Gamma Rays from an X-ray Selected Blazar Sample

Author: I. de la Calle Perez, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter‐Lewis, O. Celik, W. Cui, C. Dowdall, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. Fortson, J. A. Gaidos, K. Gibbs, S. Gammell, J. Hall, T. A. Hall, A. M. Hillas, J. Holder, D. Horan, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, S. LeBohec, E. T. Linton, J. Lloyd‐Evans, P. Moriarty, D. Muller, T. N. Nagai, R. A. Ong, M. Page, R. Pallassini, D. Petry, B. Power‐Mooney, J. Quinn, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, V. V. Vassiliev, S. P. Wakely, G. Walker, and T. C. Weekes
Subjects: High energy, tev energies, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, telescope, law.invention, Telescope, bl lacertae objects, law, emission, gamma rays : observations, flare, Blazar, bl lacertae objects : individual (rgb j0214+517, rgb j1117+202, rgb j1725+118, ies 0033+595, 1es 0120+340, Physics, Spectral properties, Astrophysics (astro-ph), X-ray, Gamma ray, Astronomy and Astrophysics, Sample (graphics), radiation, 1es 0229+200, 1es 0806+524, 1es 1426+428, 1es 1553+113, 1es 1959+650), Space and Planetary Science, markarian-501, active galactic nuclei, absorption, discovery
Abstract: Our understanding of blazars has been greatly increased in recent years by extensive multi-wavelength observations, particularly in the radio, X-ray and gamma-ray regions. Over the past decade the Whipple 10m telescope has contributed to this with the detection of 5 BL Lacertae objects at very high gamma-ray energies. The combination of multi-wavelength data has shown that blazars follow a well-defined sequence in terms of their broadband spectral properties. Together with providing constraints on emission models, this information has yielded a means by which potential sources of TeV emission may be identified and predictions made as to their possible gamma-ray flux. We have used the Whipple telescope to search for TeV gamma-ray emission from eight objects selected from a list of such candidates. No evidence has been found for VHE emission from the objects in our sample, and upper limits have been derived for the mean gamma-ray flux above 390GeV. These flux upper limits are compared with the model predictions and the implications of our results for future observations are discussed., 15 pages, 2 figures, Accepted for publication in ApJ
Published: 2003

42. Science capabilities of the VERITAS array of 10m imaging atmospheric Cerenkov gamma-ray detectors

Author: S. D. Biller, H. J. Rose, J. D. Smith, D. J. Fegan, P. Moriarity, S. P. Swordy, A. M. Hillas, A. D. Falcone, M. Schroedter, P. A. Ogden, J. A. Gaidos, P. J. Boyle, S. M. Bradbury, J. Lloyd-Evans, Jamie Holder, S. LeBohec, S. P. Wakely, G. Walker, P. Dowkontt, I. H. Bond, David Kieda, V. V. Vassiliev, Wei Cui, R. A. Ong, D. Petry, J. P. Finley, T. C. Weekes, S. Criswell, John L. Quinn, K. G. Gibbs, D. Horan, J. Knapp, M. Kertzman, S. Gammell, S. J. Fegan, D. A. Carter-Lewis, P. T. Reynolds, D. M̈ller, Lucy Fortson, F. Krennrich, J. Hall, J. H. Buckley, C. Duke, and G. Sembrowski
Subjects: Physics, Aperture, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy, Cosmic ray, Gamma-ray astronomy, Cherenkov Telescope Array, law.invention, Telescope, Pulsar, law, Cherenkov radiation
Abstract: The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of seven 10m aperture telescopes used for gamma-ray astronomy in the 50 GeV to 50 TeV (1 TeV= 1012 electron Volt) energy range. The gamma rays are detected by measuring the optical Cherenkov light emitted by the cascade of electromagnetic particles that is generated by interactions of the high energy gamma-ray with the Earth's Atmosphere. This paper describes the science goals of the VERITAS array, a description of the array, and expected performance of the instrument.
Published: 2003

43. Detection of t[clc]e[/clc]v gamma rays from the bl lacertae object 1es 1959+650 with the whipple 10 meter telescope

Author: J. Holder, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, W. Cui, C. Dowdall, C. Duke, I. de la Calle Perez, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. Fortson, J. A. Gaidos, K. Gibbs, S. Gammell, J. Hall, T. A. Hall, A. M. Hillas, D. Horan, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, S. LeBohec, E. T. Linton, J. Lloyd-Evans, P. Moriarty, D. Müller, T. N. Nagai, R. Ong, M. Page, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, V. V. Vassiliev, S. P. Wakely, G. Walker, and T. C. Weekes
Subjects: Physics, High energy, mkn-501, active galaxy markarian-421, blazars, Gamma ray, Flux, Astronomy and Astrophysics, Astrophysics, system, energy-spectrum, law.invention, Telescope, radiation, Crab Nebula, x-ray, Space and Planetary Science, law, bl lacertae objects : individual (1es 1959+650), photons, gamma rays : observations, Imaging technique, strong flares, Cherenkov radiation, BL Lac object
Abstract: We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray selected BL Lacertae object 1ES1959+650. Observations were made with the Whipple 10m telescope on Mt. Hopkins, Arizona, using the atmospheric Cherenkov imaging technique. The flux between May and July 2002 was highly variable, with a mean of 0.64 +/- 0.03 times the steady flux from the Crab Nebula and reaching a maximum of five Crab, with variability on timescales as short as seven hours.
Published: 2003

44. Search for TeV emissions from pulsars in binary systems

Author: M. J. Lang, D. J. Fegan, Tony Hall, John Kildea, M. D'Vali, H. J. Rose, J. A. Gaidos, R. W. Lessard, John L. Quinn, B. McKernan, M. J. Carson, D. Horan, Dietrich Müller, A. M. Hillas, J. Knapp, J. H. Buckley, S. LeBohec, P. Moriarty, P. T. Reynolds, S. J. Fegan, G. H. Sembroski, David Kieda, M. Catanese, R. A. Ong, D. A. Carter-Lewis, S. M. Bradbury, V. V. Vassiliev, S. P. Swordy, J. P. Finley, T. C. Weekes, F. Krennrich, I. H. Bond, J. Lloyd-Evans, M. Kertzman, G. H. Gillanders, and S. Dunlea
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Flux, Binary number, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Radiation, egret catalog, law.invention, Telescope, Pulsar, law, Millisecond pulsar, millisecond pulsars, gamma rays : observations, Spin (physics), psr 1957+20, Astrophysics::Galaxy Astrophysics, Physics, lsi+61-degrees-303, Gamma ray, pulsars : general, Astronomy, Astronomy and Astrophysics, source 2cg 135+01, acceleration, gamma-ray emission, radiation, x-ray, Space and Planetary Science, source 2cg-135+01, centaurus x-3, psr-1957+20, counterpart, hd-154791
Abstract: A survey of binary systems containing pulsars was conducted, with the intention of detecting Galactic sources of very high energy � -ray emission. Observations were carried out with the Whipple 10 m imaging atmospheric Cerenkov telescope. Standard analysis techniques were applied to these sources to search for steady, unpulsed emission. Periodic tests were also performed to search for emission correlated with both the orbital and spin phases, where appropriate. Analyses indicate that the binaries in this study do not emit detectable levels of very high energy photons within the sensitivity of our instrument. The flux upper limits presented here fail to seriously constrain emission models. Subject headings: gamma rays: observations — pulsars: general
Published: 2003

45. Discovery of spectral variability of markarian 421 at t[clc]e[/clc]v energies

Author: R. Pallassini, M. Jordan, N. W. Reay, Dietrich Müller, Wei Cui, S. J. Fegan, D. Horan, I. de la Calle Perez, R. A. Ong, Jamie Holder, G. H. Sembroski, S. LeBohec, S. P. Wakely, S. P. Swordy, S. M. Bradbury, N. Stanton, I. H. Bond, Tony Hall, M. Kertzman, J. H. Buckley, P. T. Reynolds, Frank Krennrich, D. A. Carter-Lewis, Vladimir Vassiliev, J. P. Finley, D. J. Fegan, J. Knapp, T. C. Weekes, D. Petry, K. Kosack, David Kieda, M. J. Lang, P. Moriarty, John L. Quinn, K. G. Gibbs, H. J. Rose, J. A. Gaidos, G. H. Gillanders, John Kildea, A. M. Hillas, and R. Sidwell
Subjects: mkn-501, Astrophysics::High Energy Astrophysical Phenomena, Flux, cat observations, Astrophysics, Power law, Spectral line, Observatory, Cutoff, photons, cutoff, gamma rays : observations, flare, Blazar, mkn-421, Physics, Spectral index, active galaxy markarian-421, Astronomy and Astrophysics, gamma-rays, Crab Nebula, x-ray, Space and Planetary Science, High Energy Physics::Experiment, bl lacertae objects : individual (markarian 421), cherenkov telescope system
Abstract: The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10 m gamma-ray telescope taken in 2000/2001 revealed exceptionally strong and long-lasting flaring activity. Flaring levels of 0.4-13 times that of the Crab Nebula flux provided sufficient statistics for a detailed study of the energy spectrum between 380 GeV and 8.2 TeV as a function of the flux level. These spectra are well described by a power law with an exponential cutoff: dN/dE proportional to E(-alpha)e(-E/Eo) m(-2) s(-1) TeV-1. There is no evidence for variation in the cutoff energy with flux, and all spectra are consistent with an average value for the cutoff energy of 4.3 TeV. The spectral index varies between 1.89 +/- 0.04(stat) +/- 0.05(syst) in a high flux state and 2.72 +/- 0.11(stat) +/- 0.05(syst) in a low state. The correlation between spectral index and flux is tight when averaging over the total 2000/ 2001 data set. Spectral measurements of Mrk 421 from previous years (1995/1996 and 1999) by the Whipple collaboration are consistent with this flux-spectral index correlation, which suggests that this may be a constant or a long-term property of the source. If a similar flux-spectral index correlation were found for other gamma-ray blazars, this universal property could help disentangle the intrinsic emission mechanism from external absorption effects.
Published: 2002

46. Detection of the BL Lac Object H1426+428 at TeV Gamma Ray Energies

Author: D. Horan, H. M. Badran, I. H. Bond, S. M. Bradbury, J. H. Buckley, M. J. Carson, D. A. Carter‐Lewis, M. Catanese, W. Cui, S. Dunlea, D. Das, I. de la Calle Perez, M. D’Vali, D. J. Fegan, S. J. Fegan, J. P. Finley, J. A. Gaidos, K. Gibbs, G. H. Gillanders, T. A. Hall, A. M. Hillas, J. Holder, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, F. Krennrich, M. J. Lang, S. LeBohec, R. Lessard, J. Lloyd‐Evans, B. McKernan, P. Moriarty, D. Muller, R. Ong, R. Pallassini, D. Petry, J. Quinn, N. W. Reay, P. T. Reynolds, H. J. Rose, G. H. Sembroski, R. Sidwell, N. Stanton, S. P. Swordy, V. V. Vassiliev, S. P. Wakely, and T. C. Weekes
Subjects: Physics, lac, Astrophysics (astro-ph), blazars, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, system, Synchrotron, Redshift, law.invention, spectrum, Telescope, Space and Planetary Science, law, Observatory, emission, bl lacertae objects : individual (1es 1426+42.8) gamma rays : observations, markarian-421, photons, Blazar, Cherenkov radiation, BL Lac object
Abstract: A very high energy (VHE) gamma-ray signal has been detected at the 5.4 sigma level from H1426+428, an x-ray selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 - 1998 with the Whipple 10m imaging atmospheric Cherenkov telescope as part of a general blazar survey; the results of these observations, although not statistically significant, were consistently positive. X-ray observations of H1426+428 during 1999 with the BeppoSAX instrument revealed that the peak of its synchrotron spectrum occurs at > 100 keV, leading to the prediction of observable TeV emission from this object. H1426+428 was monitored extensively at the Whipple Observatory during the 1999, 2000, and 2001 observing seasons. The strongest TeV signals were detected in 2000 and 2001. During 2001, an integral flux of 2.04 +/- 0.35 x10e-11 cm-2 s-1 above 280 GeV was recorded from H1426+428. The detection of H1426+428 supports the idea that, as also seen in Markarian 501 and 1ES2344+514, BL Lacertae objects with extremely high synchrotron peak frequencies produce gamma rays in the TeV range., 35 pages, 7 figures, accepted by ApJ Two upper limits in Table 3 (upper limits for 1995 and 1997) are different from the ApJ version
Published: 2002

47. The Cosmic Ray Background as a Tool for Relative Calibration of Atmospheric Cherenkov Telescopes

Author: Jamie Holder and S. LeBohec
Subjects: Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, law.invention, Telescope, Atmosphere, Optics, law, Calibration, business, Beam (structure), Cherenkov radiation, Zenith
Abstract: The atmosphere is an intrinsic part of any ground based Cherenkov gamma-ray telescope, and the telescope response is therefore sensitive to unpredictable changes in the atmospheric transparency which are difficult to measure and interpret in the absence of a calibrated beam of high energy gamma-rays. In this paper, we use the detector response to Cherenkov emission from cosmic ray initiated air showers to obtain a relative calibration for data obtained under different instrumental and atmospheric conditions as well as over a range of source angles to the Zenith. We show that such a relative calibration is useful and efficient for data selection, for correcting the measured gamma-ray rate and for inter-calibration between the elements of an array of Cherenkov telescopes., Comment: 19 pages. Accepted for publication in Astroparticle Physics
Published: 2002
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48. Gamma-ray Observations of the Galactic Plane at Energies E > 500 GeV

Author: D. Horan, M. D'Vali, A. M. Burdett, M. F. Cawley, V.V. Vassiliev, J. P. Finley, Frank W. Samuelson, D. A. Carter-Lewis, G. H. Sembroski, J. Knapp, Frank Krennrich, T. C. Weekes, S. M. Bradbury, S. Dunlea, D. J. Fegan, John L. Quinn, S. J. Fegan, H. J. Rose, J. A. Gaidos, Tony Hall, J. H. Buckley, C. Masterson, I. H. Bond, S. LeBohec, D. Macomb, M. Catanese, R. W. Lessard, and A. M. Hillas
Subjects: Physics, Spectral index, biology, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Inverse, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galactic plane, biology.organism_classification, law.invention, Telescope, Space and Planetary Science, law, Observatory, Egret, High Energy Physics::Experiment, Longitude, Astrophysics::Galaxy Astrophysics
Abstract: In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse gamma ray emission from the Galactic Plane. No signifiant evidence of emission was found. Assuming the TeV emission profile matches EGRET observations above 1 GeV with a differential spectral index of 2.4, we derive an upper limit of {$\rm {3.0\cdot10^{-8}cm^{-2}s^{-1}sr^{-1}}$} for the average diffuse emission above {{$\rm500 GeV$}} in the galactic latitude range from {{$\rm-2^o$ to $\rm +2^o$}} at galactic longitude {{$\rm 40^o$}}. Comparisons with EGRET observations provide a lower limit of 2.31 for the differential spectral index of the diffuse emission, assuming there is no break in the spectrum between 30 GeV and 500 GeV. This constrains models for diffuse emission with a significant inverse Compton contribution., Comment: 18 pages, 9 figures, other comments
Published: 2000

49. The status of the Whipple 10m GRANITE III upgrade program

Author: John L. Quinn, B. McKernan, S. M. Bradbury, Frank W. Samuelson, D. A. Carter-Lewis, S. J. Fegan, V. V. Vassiliev, M. D'Vali, I. H. Bond, A. C. Breslin, A. M. Burdett, M. J. Carson, S. Dunlea, M. Catanese, A. M. Hillas, D. Horan, Tony Hall, J. H. Buckley, G. H. Sembroski, J. Knapp, F. Krennrich, S. LeBohec, D. J. Fegan, J. A. Gaidos, H. J. Rose, C. Masterson, M. F. Cawley, R. W. Lessard, J. P. Finley, and T. C. Weekes
Subjects: Physics, Telescope, Upgrade, Pixel, business.industry, law, Night sky, Astronomy, Gamma-ray astronomy, business, Computer hardware, law.invention
Abstract: The Whipple Collaboration has been carrying out an upgrade program, GRANITE III, on the 10m telescope atop Mt. Hopkins. The 3 year program, 1996 through 1999, has involved a large field-of-view camera, a hardware pattern recognition trigger, and finally a small pixel camera. Results of the first and second stage of the program indicate that a large field-of-view yield an increased collection area for cosmic-ray triggers and the hardware pattern trigger reduces the energy threshold of the telescope by greatly suppressing night sky accidental triggers over a simple multiplicity coincidence trigger. The final phase of the program, being completed during the summer and fall of 1999, will be the installation of a small pixel camera. The pixel size of ∼0°.12 will yield the lowest threshold energy at which the 10 m Whipple telescope has ever operated.
Published: 2000

50. The Very Energetic Radiation Imaging Telescope Array System (VERITAS)

Author: J. Lloyd-Evans, D. J. Fegan, A. C. Breslin, J. P. Finley, Philip Kaaret, J. A. Gaidos, I. H. Bond, T. C. Weekes, D. A. Carter-Lewis, J. Knapp, G. Hermann, J. H. Buckley, Jonathan E. Grindlay, S. P. Swordy, A. M. Hillas, F. Krennrich, V. V. Vassiliev, R. A. Ong, S. LeBohec, Brenda Dingus, Dietrich Müller, H. J. Rose, S. M. Bradbury, John L. Quinn, M. H. Salamon, M. Catanese, G. H. Sembroski, D. B. Kieda, and R. W. Lessard
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Gamma-ray astronomy, Astrophysics, Cherenkov Telescope Array, law.invention, Telescope, Crab Nebula, Pulsar, Observatory, law, Astrophysics::Galaxy Astrophysics, Cherenkov radiation, Fermi Gamma-ray Space Telescope
Abstract: An overview of the current status and scientific goals of VERITAS, a proposed hexagonal array of seven 10 m aperture imaging Cherenkov telescopes, is provided. The selected site is close to Mt. Hopkins, the site of the Whipple Observatory, in Arizona. Each telescope, of 12 m focal length, will be equipped with a 499 element photomultiplier camera covering a 3.5 degree field of view. A central station will initiate the readout of 500 MHz FADCs upon receipt of multiple telescope triggers. The minimum detectable flux sensitivity will be 0.5% of the Crab Nebula flux at 200 GeV. VERITAS will operate primarily as a γ-ray observatory in the 50 GeV to 50 TeV range for the study of active galaxies, supernova remnants, pulsars and gamma-ray bursts.
Published: 2000

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