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Start Over Author "Frieman, Joshua A" Publisher escholarship, university of california
5 results on '"Frieman, Joshua A"'

1. Candidate Periodically Variable Quasars from the Dark Energy Survey and the Sloan Digital Sky Survey

Author

Chen, Yu-Ching, Liu, Xin, Liao, Wei-Ting, Holgado, A Miguel, Guo, Hengxiao, Gruendl, Robert A, Morganson, Eric, Shen, Yue, Zhang, Kaiwen, Abbott, Tim MC, Aguena, Michel, Allam, Sahar, Avila, Santiago, Bertin, Emmanuel, Bhargava, Sunayana, Brooks, David, Burke, David L, Rosell, Aurelio Carnero, Carollo, Daniela, Kind, Matias Carrasco, Carretero, Jorge, Costanzi, Matteo, da Costa, Luiz N, Davis, Tamara M, De Vicente, Juan, Desai, Shantanu, Diehl, H Thomas, Doel, Peter, Everett, Spencer, Flaugher, Brenna, Friedel, Douglas, Frieman, Joshua, García-Bellido, Juan, Gaztanaga, Enrique, Glazebrook, Karl, Gruen, Daniel, Gutierrez, Gaston, Hinton, Samuel R, Hollowood, Devon L, James, David J, Kim, Alex G, Kuehn, Kyler, Kuropatkin, Nikolay, Lewis, Geraint F, Lidman, Christopher, Lima, Marcos, Maia, Marcio AG, March, Marisa, Marshall, Jennifer L, Menanteau, Felipe, Miquel, Ramon, Palmese, Antonella, Paz-Chinchón, Francisco, Plazas, Andrés A, Sanchez, Eusebio, Schubnell, Michael, Serrano, Santiago, Sevilla-Noarbe, Ignacio, Smith, Mathew, Suchyta, Eric, Swanson, Molly EC, Tarle, Gregory, Tucker, Brad E, Varga, Tamas Norbert, and Walker, Alistair R

Subjects
Space Sciences, Astronomical Sciences, Physical Sciences, black hole physics, surveys, galaxies: active, galaxies: high-redshift, galaxies: nuclei, quasars: general, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract

Periodically variable quasars have been suggested as close binary supermassive black holes. We present a systematic search for periodic light curves in 625 spectroscopically confirmed quasars with a median redshift of 1.8 in a 4.6 deg2 overlapping region of the Dark Energy Survey Supernova (DES-SN) fields and the Sloan Digital Sky Survey Stripe 82 (SDSS-S82). Our sample has a unique 20-yr long multicolour (griz) light curve enabled by combining DES-SN Y6 observations with archival SDSS-S82 data. The deep imaging allows us to search for periodic light curves in less luminous quasars (down to r∼23.5 mag) powered by less massive black holes (with masses ≳ 108.5M⊙) at high redshift for the first time. We find five candidates with significant (at >99.74 per cent single-frequency significance in at least two bands with a global p-value of ∼7 × 10-4 -3 × 10-3 accounting for the look-elsewhere effect) periodicity with observed periods of ∼3-5 yr (i.e. 1-2 yr in rest frame) having ∼4-6 cycles spanned by the observations. If all five candidates are periodically variable quasars, this translates into a detection rate of ∼0.8+0.5-0.3 per cent or ∼1.1+0.7-0.5 quasar per deg2. Our detection rate is 4-80 times larger than those found by previous searches using shallower surveys over larger areas. This discrepancy is likely caused by differences in the quasar populations probed and the survey data qualities. We discuss implications on the future direct detection of low-frequency gravitational waves. Continued photometric monitoring will further assess the robustness and characteristics of these candidate periodic quasars to determine their physical origins.

Published
2020

2. Dark Matter Science in the Era of LSST

Author

Bechtol, Keith, Drlica-Wagner, Alex, Abazajian, Kevork N, Abidi, Muntazir, Adhikari, Susmita, Ali-Haïmoud, Yacine, Annis, James, Ansarinejad, Behzad, Armstrong, Robert, Asorey, Jacobo, Baccigalupi, Carlo, Banerjee, Arka, Banik, Nilanjan, Bennett, Charles, Beutler, Florian, Bird, Simeon, Birrer, Simon, Biswas, Rahul, Biviano, Andrea, Blazek, Jonathan, Boddy, Kimberly K, Bonaca, Ana, Borrill, Julian, Bose, Sownak, Bovy, Jo, Frye, Brenda, Brooks, Alyson M, Buckley, Matthew R, Buckley-Geer, Elizabeth, Bulbul, Esra, Burchat, Patricia R, Burgess, Cliff, Calore, Francesca, Caputo, Regina, Castorina, Emanuele, Chang, Chihway, Chapline, George, Charles, Eric, Chen, Xingang, Clowe, Douglas, Cohen-Tanugi, Johann, Comparat, Johan, Croft, Rupert AC, Cuoco, Alessandro, Cyr-Racine, Francis-Yan, D'Amico, Guido, Davis, Tamara M, Dawson, William A, Macorra, Axel de la, Valentino, Eleonora Di, Rivero, Ana Díaz, Digel, Seth, Dodelson, Scott, Doré, Olivier, Dvorkin, Cora, Eckner, Christopher, Ellison, John, Erkal, Denis, Farahi, Arya, Fassnacht, Christopher D, Ferreira, Pedro G, Flaugher, Brenna, Foreman, Simon, Friedrich, Oliver, Frieman, Joshua, García-Bellido, Juan, Gawiser, Eric, Gerbino, Martina, Giannotti, Maurizio, Gill, Mandeep SS, Gluscevic, Vera, Golovich, Nathan, Gontcho, Satya Gontcho A, González-Morales, Alma X, Grin, Daniel, Gruen, Daniel, Hearin, Andrew P, Hendel, David, Hezaveh, Yashar D, Hirata, Christopher M, Hložek, Renee, Horiuchi, Shunsaku, Jain, Bhuvnesh, Jee, M James, Jeltema, Tesla E, Kamionkowski, Marc, Kaplinghat, Manoj, Keeley, Ryan E, Keeton, Charles R, Khatri, Rishi, Koposov, Sergey E, Koushiappas, Savvas M, Kovetz, Ely D, Lahav, Ofer, Lam, Casey, Lee, Chien-Hsiu, Li, Ting S, Liguori, Michele, Lin, Tongyan, and Lisanti, Mariangela

Subjects
astro-ph.CO, astro-ph.HE, hep-ex
Abstract

Astrophysical observations currently provide the only robust, empiricalmeasurements of dark matter. In the coming decade, astrophysical observationswill guide other experimental efforts, while simultaneously probing uniqueregions of dark matter parameter space. This white paper summarizesastrophysical observations that can constrain the fundamental physics of darkmatter in the era of LSST. We describe how astrophysical observations willinform our understanding of the fundamental properties of dark matter, such asparticle mass, self-interaction strength, non-gravitational interactions withthe Standard Model, and compact object abundances. Additionally, we highlighttheoretical work and experimental/observational facilities that will complementLSST to strengthen our understanding of the fundamental characteristics of darkmatter.

Published
2019

3. Probing the Fundamental Nature of Dark Matter with the Large Synoptic Survey Telescope

Author

Drlica-Wagner, Alex, Mao, Yao-Yuan, Adhikari, Susmita, Armstrong, Robert, Banerjee, Arka, Banik, Nilanjan, Bechtol, Keith, Bird, Simeon, Boddy, Kimberly K, Bonaca, Ana, Bovy, Jo, Buckley, Matthew R, Bulbul, Esra, Chang, Chihway, Chapline, George, Cohen-Tanugi, Johann, Cuoco, Alessandro, Cyr-Racine, Francis-Yan, Dawson, William A, Rivero, Ana Díaz, Dvorkin, Cora, Erkal, Denis, Fassnacht, Christopher D, García-Bellido, Juan, Giannotti, Maurizio, Gluscevic, Vera, Golovich, Nathan, Hendel, David, Hezaveh, Yashar D, Horiuchi, Shunsaku, Jee, M James, Kaplinghat, Manoj, Keeton, Charles R, Koposov, Sergey E, Lam, Casey Y, Li, Ting S, Lu, Jessica R, Mandelbaum, Rachel, McDermott, Samuel D, McNanna, Mitch, Medford, Michael, Meyer, Manuel, Marc, Moniez, Murgia, Simona, Nadler, Ethan O, Necib, Lina, Nuss, Eric, Pace, Andrew B, Peter, Annika HG, Polin, Daniel A, Prescod-Weinstein, Chanda, Read, Justin I, Rosenfeld, Rogerio, Shipp, Nora, Simon, Joshua D, Slatyer, Tracy R, Straniero, Oscar, Strigari, Louis E, Tollerud, Erik, Tyson, J Anthony, Wang, Mei-Yu, Wechsler, Risa H, Wittman, David, Yu, Hai-Bo, Zaharijas, Gabrijela, Ali-Haïmoud, Yacine, Annis, James, Birrer, Simon, Biswas, Rahul, Blazek, Jonathan, Brooks, Alyson M, Buckley-Geer, Elizabeth, Caputo, Regina, Charles, Eric, Digel, Seth, Dodelson, Scott, Flaugher, Brenna, Frieman, Joshua, Gawiser, Eric, Hearin, Andrew P, Hložek, Renee, Jain, Bhuvnesh, Jeltema, Tesla E, Koushiappas, Savvas M, Lisanti, Mariangela, LoVerde, Marilena, Mishra-Sharma, Siddharth, Newman, Jeffrey A, Nord, Brian, Nourbakhsh, Erfan, Ritz, Steven, Robertson, Brant E, Sánchez-Conde, Miguel A, Slosar, Anže, Tait, Tim MP, Verma, Aprajita, Vilalta, Ricardo, Walter, Christopher W, Yanny, Brian, and Zentner, Andrew R

Subjects
astro-ph.CO, astro-ph.GA, astro-ph.HE, hep-ex, hep-ph
Abstract

Astrophysical and cosmological observations currently provide the onlyrobust, empirical measurements of dark matter. Future observations with LargeSynoptic Survey Telescope (LSST) will provide necessary guidance for theexperimental dark matter program. This white paper represents a communityeffort to summarize the science case for studying the fundamental physics ofdark matter with LSST. We discuss how LSST will inform our understanding of thefundamental properties of dark matter, such as particle mass, self-interactionstrength, non-gravitational couplings to the Standard Model, and compact objectabundances. Additionally, we discuss the ways that LSST will complement otherexperiments to strengthen our understanding of the fundamental characteristicsof dark matter. More information on the LSST dark matter effort can be found athttps://lsstdarkmatter.github.io/ .

Published
2019

4. THE MULTI-OBJECT, FIBER-FED SPECTROGRAPHS FOR THE SLOAN DIGITAL SKY SURVEY AND THE BARYON OSCILLATION SPECTROSCOPIC SURVEY

Author

Smee, Stephen A, Gunn, James E, Uomoto, Alan, Roe, Natalie, Schlegel, David, Rockosi, Constance M, Carr, Michael A, Leger, French, Dawson, Kyle S, Olmstead, Matthew D, Brinkmann, Jon, Owen, Russell, Barkhouser, Robert H, Honscheid, Klaus, Harding, Paul, Long, Dan, Lupton, Robert H, Loomis, Craig, Anderson, Lauren, Annis, James, Bernardi, Mariangela, Bhardwaj, Vaishali, Bizyaev, Dmitry, Bolton, Adam S, Brewington, Howard, Briggs, John W, Burles, Scott, Burns, James G, Castander, Francisco Javier, Connolly, Andrew, Davenport, James R. A, Ebelke, Garrett, Epps, Harland, Feldman, Paul D, Friedman, Scott D, Frieman, Joshua, Heckman, Timothy, Hull, Charles L, Knapp, Gillian R, Lawrence, David M, Loveday, Jon, Mannery, Edward J, Malanushenko, Elena, Malanushenko, Viktor, Merrelli, Aronne James, Muna, Demitri, Newman, Peter R, Nichol, Robert C, Oravetz, Daniel, Pan, Kaike, Pope, Adrian C, Ricketts, Paul G, Shelden, Alaina, Sandford, Dale, Siegmund, Walter, Simmons, Audrey, Smith, D. Shane, Snedden, Stephanie, Schneider, Donald P, SubbaRao, Mark, Tremonti, Christy, Waddell, Patrick, and York, Donald G

Published
2013

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