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1. An indirect search for dark matter with a combined analysis of dwarf spheroidal galaxies from VERITAS

Author

Acharyya, A., Adams, C. B., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Christiansen, J. L., Chromey, A. J., Duerr, A., Errando, M., Falcone, A., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Hanlon, W., Hanna, D., Hervet, O., Hinrichs, C. E., Holder, J., Humensky, T. B., Jin, W., Johnson, M. N., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Korzoun, N., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, Conor E., Millard, M. J., Mooney, C. L., Moriarty, P., Mukherjee, R., Ning, W., O'Brien, S., Ong, R. A., Park, N., Pohl, M., Pueschel, E., Quinn, J., Rabinowitz, P. L., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Saha, L., Sembroski, G. H., Shang, R., Splettstoesser, M., Tak, Donggeun, Talluri, A. K., Tucci, J. V., Vassiliev, V. V., Weinstein, A., Williams, D. A., and Wong, S. L.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Understanding the nature and identity of dark matter is a key goal in the physics community. In the case that TeV-scale dark matter particles decay or annihilate into standard model particles, very-high-energy (VHE) gamma rays (greater than 100 GeV) will be present in the final state. The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an imaging atmospheric Cherenkov telescope array that can indirectly detect VHE gamma rays in an energy range of 100 GeV to > 30 TeV. Dwarf spheroidal galaxies (dSphs) are ideal candidates in the search for dark matter due to their high dark matter content, high mass-to-light ratios, and their low gamma-ray fluxes from astrophysical processes. This study uses a legacy data set of 638 hours collected on 17 dSphs, built over 11 years with an observing strategy optimized according to the dark matter content of the targets. The study addresses a broad dark matter particle mass range, extending from 200 GeV to 30 PeV. In the absence of a detection, we set the upper limits on the dark matter velocity-weighted annihilation cross section., Comment: 18 pages, 7 figures, 3 tables, accepted in PRD

Published
2024

2. An Angular Diameter Measurement of $\beta$ UMa via Stellar Intensity Interferometry with the VERITAS Observatory

Author

Acharyya, A., Aufdenberg, J. P., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Chromey, A. J., Davis, J. D., Feng, Q., Foote, G. M., Furniss, A., Hanlon, W., Hinrichs, C. E., Holder, J., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Korzoun, N., LeBohec, T., Lisa, M. A., Lundy, M., Matthews, N., McGrath, C. E, Millard, M. J., Moriarty, P., Nikkhah, S., O'Brien, S., Ong, R. A., Pohl, M., Pueschel, E., Quinn, J., Rabinowitz, P. L., Ragan, K., Roache, E., Rose, J. G., Sackrider, J. L., Sadeh, I., Saha, L., Sembroski, G. H., Shang, R., Tak, D., Ticoras, M., Tucci, J. V., Wong, S. L., and Collaboration, The VERITAS

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We use the VERITAS imaging air Cherenkov Telescope (IACT) array to obtain the first measured angular diameter of $\beta$ UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain the limb-darkened angular diameter. The age of the Ursa Major moving group has been assessed from the ages of its members, including nuclear member Merak ($\beta$ UMa), an A1-type subgiant, by comparing effective temperature and luminosity constraints to model stellar evolution tracks. Previous interferometric limb-darkened angular-diameter measurements of $\beta$ UMa in the near-infrared (CHARA Array, $1.149 \pm 0.014$ mas) and mid-infrared (Keck Nuller, $1.08 \pm 0.07$ mas), together with the measured parallax and bolometric flux, have constrained the effective temperature. This paper presents current VERITAS-SII observation and analysis procedures to derive squared visibilities from correlation functions. We fit the resulting squared visibilities to find a limb-darkened angular diameter of $1.07 \pm 0.04 {\rm (stat)} \pm 0.05$ (sys) mas, using synthetic visibilities from a stellar atmosphere model that provides a good match to the spectrum of $\beta$ UMa in the optical wave band. The VERITAS-SII limb-darkened angular diameter yields an effective temperature of $9700\pm200\pm 200$ K, consistent with ultraviolet spectrophotometry, and an age of $390\pm 29 \pm 32 $ Myr, using MESA Isochrones and Stellar Tracks (MIST). This age is consistent with $408 \pm 6$ Myr from the CHARA Array angular diameter.

Published
2024

3. VERITAS contributions to the 38th International Cosmic Ray Conference

Author

Acharyya, A., Adams, C. B., Archer, A., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Christiansen, J. L., Chromey, A. J., Duerr, A., Errando, M., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Hanlon, W., Hervet, O., Hinrichs, C. E., Hoang, J., Holder, J., Hughes, Z., Humensky, T. B., Jin, W., Johnson, M. N., Kertzman, M., Kherlakian, M., Kieda, D., Kleiner, T. K., Korzoun, N., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Millard, M. J., Mooney, C. L., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Park, N., Poggemann, C., Pohl, M., Pueschel, E., Quinn, J., Rabinowitz, P. L., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Saha, L., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Talluri, A. K., Tucci, J. V., Vassiliev, V. V., Weinstein, A., Williams, D. A., Wong, S. L., and Woo, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Compilation of papers presented by the VERITAS Collaboration at the 38th International Cosmic Ray Conference (ICRC), held July 26 through August 3, 2023 in Nagoya, Japan., Comment: html page. ICRC 2023, Nagoya, Japan

Published
2023

4. A multi-wavelength investigation of PSR J2229+6114 and its pulsar wind nebula in the radio, X-ray, and gamma-ray bands

Author

Pope, I., Mori, K., Abdelmaguid, M., Gelfand, J. D., Reynolds, S. P., Safi-Harb, S., Hailey, C. J., An, H., Collaboration, VERITAS, Bangale, P., Batista, P., Benbow, W., Buckley, J. H., Capasso, M., Christiansen, J. L., Chromey, A. J., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M, Gallagher, G., Hanlon, W. F, Hanna, D., Hervet, O., Holder, J., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Korzoun, N., Krennrich, F., Kumar, S., Lang, M. J., Maier, G., McGrath, C. E, Mooney, C. L., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Park, N., Patel, S. R., Pfrang, K., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Roache, E., Sadeh, I., Saha, L., Sembroski, G. H., Tak, D., Tucci, J. V., Weinstein, A., Williams, D. A., and Woo, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

G106.3$+$2.7, commonly considered a composite supernova remnant (SNR), is characterized by a boomerang-shaped pulsar wind nebula (PWN) and two distinct ("head" & "tail") regions in the radio band. A discovery of very-high-energy (VHE) gamma-ray emission ($E_\gamma > 100$ GeV) followed by the recent detection of ultra-high-energy (UHE) gamma-ray emission ($E_\gamma > 100$ TeV) from the tail region suggests that G106.3$+$2.7 is a PeVatron candidate. We present a comprehensive multi-wavelength study of the Boomerang PWN (100" around PSR J2229+6114) using archival radio and Chandra data obtained from two decades ago, a new NuSTAR X-ray observation from 2020, and upper limits on gamma-ray fluxes obtained by Fermi and VERITAS observatories. The NuSTAR observation allowed us to detect a 51.67 ms spin period from the pulsar PSR J2229+6114 and the PWN emission characterized by a power-law model with $\Gamma = 1.52\pm0.06$ up to 20 keV. Contrary to the previous radio study by Kothes et al. 2006, we prefer a much lower PWN B-field ($B\sim3$ $\mu$G) and larger distance ($d \sim 8$ kpc) based on (1) the non-varying X-ray flux over the last two decades, (2) the energy-dependent X-ray PWN size resulting from synchrotron burn-off and (3) the multi-wavelength spectral energy distribution (SED) data. Our SED model suggests that the PWN is currently re-expanding after being compressed by the SNR reverse shock $\sim 1000$ years ago. In this case, the head region should be formed by GeV--TeV electrons injected earlier by the pulsar propagating into the low density environment.

Published
2023

5. Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A

Author

Acharyya, A., Adams, C. B., Archer, A., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Brill, A., Buckley, J. H., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Gallagher, G., Hanlon, W., Hanna, D., Hervet, O., Hinrichs, C. E., Hoang, J., Holder, J., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kherlakian, M., Kieda, D., Kleiner, T. K., Korzoun, N., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Millard, M. J., Millis, J., Mooney, C. L., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Sadeh, I., Sadun, A. C., Saha, L., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Talluri, A. Kaushik, Tucci, J. V., Vassiliev, V. V., Weinstein, A., Williams, D. A., Wong, S. L., Woo, J., Aharonian, F., Aschersleben, J., Backes, M., Martins, V. Barbosa, Batzofin, R., Becherini, Y., Berge, D., Bernlohr, K., Bi, B., Bottcher, M., Boisson, C., Bolmont, J., de Lavergne, M. de Bony, Borowska, J., Bouyahiaoui, M., Bradascio, F., Breuhaus, M., Brose, R., Brun, F., Bruno, B., Bulik, T., Burger-Scheidlin, C., Caroff, S., Casanova, S., Cecil, R., Celic, J., Cerruti, M., Chand, T., Chandra, S., Chen, A., Chibueze, J., Chibueze, O., Cotter, G., Dai, S., Mbarubucyeye, J. Damascene, Djannati-Atai, A., Dmytriiev, A., Doroshenko, V., Einecke, S., Ernenwein, J. -P., de Clairfontaine, G. Fichet, Filipovic, M., Fontaine, G., Fussling, M., Funk, S., Gabici, S., Ghafourizadeh, S., Giavitto, G., Glawion, D., Glicenstein, J. F., Goswami, P., Grolleron, G., Haerer, L., Hinton, J. A., Holch, T. L., Holler, M., Horns, D., Jamrozy, M., Jankowsky, F., Joshi, V., Jung-Richardt, I., Kasai, E., Katarzynski, K., Khatoon, R., Khelifi, B., Klepser, S., Kluzniak, W., Kosack, K., Kostunin, D., Lang, R. G., Stum, S. Le, Lemiere, A., Lenain, J. P., Leuschner, F., Lohse, T., Luashvili, A., Lypova, I., Mackey, J., Malyshev, D., Marandon, V., Marchegiani, P., Marcowith, A., Marti-Devesa, G., Marx, R., Mitchell, A., Moderski, R., Mohrmann, L., Montanari, A., Moulin, E., Murach, T., Nakashima, K., Niemiec, J., Noel, A. Priyana, O'Brien, P., Olivera-Nieto, L., Wilhelmi, E. de Ona, Ostrowski, M., Panny, S., Panter, M., Peron, G., Prokhorov, D. A., Puhlhofer, G., Punch, M., Quirrenbach, A., Reichherzer, P., Reimer, A., Reimer, O., Ren, H., Renaud, M., Rieger, F., Rudak, B., Ruiz-Velasco, E., Sahakian, V., Santangelo, A., Sasaki, M., Schafer, J., Schussler, F., Schutte, H. M., Schwanke, U., Shapopi, J. N. S., Specovius, A., Spencer, S., Stawarz, L., Steenkamp, R., Steinmassl, S., Sushch, I., Suzuki, H., Takahashi, T., Tanaka, T., Terrier, R., van Eldik, C., Vecchi, M., Veh, J., Venter, C., Vink, J., White, R., Wierzcholska, A., Wong, Yu Wun, Zacharias, M., Zargaryan, D., Zdziarski, A. A., Zech, A., Zouari, S., Zywucka, N., and Mori, K.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on multiwavelength target-of-opportunity observations of the blazar PKS 0735+178, located 2.2$^\circ$ away from the best-fit position of the IceCube neutrino event IceCube-211208A detected on December 8, 2021. The source was in a high-flux state in the optical, ultraviolet, X-ray, and GeV gamma-ray bands around the time of the neutrino event, exhibiting daily variability in the soft X-ray flux. The X-ray data from Swift-XRT and NuSTAR characterize the transition between the low-energy and high-energy components of the broadband spectral energy distribution (SED), and the gamma-ray data from Fermi -LAT, VERITAS, and H.E.S.S. require a spectral cut-off near 100 GeV. Both X-ray and gamma-ray measurements provide strong constraints on the leptonic and hadronic models. We analytically explore a synchrotron self-Compton model, an external Compton model, and a lepto-hadronic model. Models that are entirely based on internal photon fields face serious difficulties in matching the observed SED. The existence of an external photon field in the source would instead explain the observed gamma-ray spectral cut-off in both leptonic and lepto-hadronic models and allow a proton jet power that marginally agrees with the Eddington limit in the lepto-hadronic model. We show a numerical lepto-hadronic model with external target photons that reproduces the observed SED and is reasonably consistent with the neutrino event despite requiring a high jet power., Comment: 21 pages, 3 figures, accepted by ApJ

Published
2023

6. Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS

Author

Acharyya, A., Archer, A., Bangale, P., Bartkoske, J. T., Batista, P., Baumgart, M., Benbow, W., Buckley, J. H., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gallagher, G., Hanlon, W. F., Hervet, O., Hoang, J., Holder, J., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kherlakian, M., Kieda, D., Kleiner, T. K., Korzoun, N., Krennrich, F., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Moriarty, P., O'Brien, S., Ong, R. A., Pfrang, K., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Roache, E., Rodd, N. L., Ryan, J. L., Sadeh, I., Saha, L., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Tak, D., Tucci, J. V., Vassiliev, V. V., and Williams, D. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in their conventional parameter space (100 GeV $\lesssim M_{\chi} \lesssim$ 100 TeV), a mass range accessible with current Imaging Atmospheric Cherenkov Telescopes. As ultraheavy dark matter (UHDM; $M_{\chi} \gtrsim$ 100 TeV) has been suggested as an under-explored alternative to the WIMP paradigm, we search for an indirect dark matter annihilation signal in a higher mass range (up to 30 PeV) with the VERITAS gamma-ray observatory. With 216 hours of observations of four dwarf spheroidal galaxies, we perform an unbinned likelihood analysis. We find no evidence of a $\gamma$-ray signal from UHDM annihilation above the background fluctuation for any individual dwarf galaxy nor for a joint-fit analysis, and consequently constrain the velocity-weighted annihilation cross section of UHDM for dark matter particle masses between 1 TeV and 30 PeV. We additionally set constraints on the allowed radius of a composite UHDM particle., Comment: 10 pages, 7 figures

Published
2023
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7. VERITAS and Fermi-LAT constraints on the Gamma-ray Emission from Superluminous Supernovae SN2015bn and SN2017egm

Author

Acharyya, A., Adams, C. B., Bangale, P., Benbow, W., Buckley, J. H., Capasso, M., Dwarkadas, V. V., Errando, M., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gallagher, G., Gent, A., Hanlon, W. F, Hervet, O., Holder, J., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kherlakian, M., Kieda, D., Kleiner, T. K, Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Millis, J., Moriarty, P., Mukherjee, R., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Patel, S. R., Pfrang, K., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Tak, D., Tucci, J. V., Weinstein, A., Williams, D. A., Metzger, B. D., Nicholl, M., and Vurm, I.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Superluminous supernovae (SLSNe) are a rare class of stellar explosions with luminosities ~10-100 times greater than ordinary core-collapse supernovae. One popular model to explain the enhanced optical output of hydrogen-poor (Type I) SLSNe invokes energy injection from a rapidly spinning magnetar. A prediction in this case is that high-energy gamma rays, generated in the wind nebula of the magnetar, could escape through the expanding supernova ejecta at late times (months or more after optical peak). This paper presents a search for gamma-ray emission in the broad energy band from 100 MeV to 30 TeV from two Type I SLSNe, SN2015bn, and SN2017egm, using observations from Fermi-LAT and VERITAS. Although no gamma-ray emission was detected from either source, the derived upper limits approach the putative magnetar's spin-down luminosity. Prospects are explored for detecting very-high-energy (VHE; 100 GeV - 100 TeV) emission from SLSNe-I with existing and planned facilities such as VERITAS and CTA., Comment: 20 pages, 7 figures, 2 tables

Published
2023
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8. VTSCat: The VERITAS Catalog of Gamma-Ray Observations

Author

Acharyya, A., Adams, C. B., Archer, A., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Buckley, J. H., Brill, A., Capasso, M., Christiansen, J. L., Chromey, A. J., Daniel, M. K., Errando, M., Falcone, A., Farrell, K. A, Feng, Q., Finley, J. P., Foote, G. M, Fortson, L., Furniss, A., Gallagher, G., Gent, A., Giuri, C., Gueta, O., Hanlon, W. F, Hanna, D., Hassan, T., Hervet, O., Hoang, J., Holder, J., Hughes, G., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Korzoun, N., Krennrich, F., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Millard, M. J, Mooney, C. L., Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Otte, A. N., Pandel, D., Park, N., Patel, S. R., Patel, S., Pfrang, K., Pichel, A., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Richards, G. T., Roache, E., Rovero, A. C., Rulten, C., Ryan, J. L., Sadeh, I., Santander, M., Schlenstedt, S., Sembroski, G. H., Shang, R., Splettstoesser, M., Stevenson, B., Tak, D., Vassiliev, V. V., Wakely, S. P., Weinstein, A., Williams, D. A., Williamson, T. J, Angelini, L., Basu-Zych, A., Sabol, E., and Smale, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The ground-based gamma-ray observatory VERITAS (Very Energetic Radiation Imaging Telescope Array System) is sensitive to photons of astrophysical origin with energies in the range between $\approx 85$ GeV to $\approx 30$ TeV. The instrument consists of four 12-m diameter imaging Cherenkov telescopes operating at the Fred Lawrence Whipple Observatory (FLWO) in southern Arizona. VERITAS started four-telescope operations in 2007 and collects about 1100 hours of good-weather data per year. The VERITAS collaboration has published over 100 journal articles since 2008 reporting on gamma-ray observations of a large variety of objects: Galactic sources like supernova remnants, pulsar wind nebulae, and binary systems; extragalactic sources like star forming galaxies, dwarf-spheroidal galaxies, and highly-variable active galactic nuclei. This note presents VTSCat: the catalog of high-level data products from all VERITAS publications., Comment: Version with corrected author list

Published
2023
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9. Gamma-ray observations of MAXI J1820+070 during the 2018 outburst

Author

Abe, H., Abe, S., Acciari, V. A., Aniello, T., Ansoldi, S., Antonelli, L. A., Engels, A. Arbet, Arcaro, C., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., de Almeida, U. Barres, Barrio, J. A., Batković, I., Baxter, J., González, J. Becerra, Bednarek, W., Bernardini, E., Bernardos, M., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Biland, A., Blanch, O., Bonnoli, G., Bošnjak, Ž., Burelli, I., Busetto, G., Carosi, R., Carretero-Castrillo, M., Ceribella, G., Chai, Y., Chilingarian, A., Cikota, S., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D'Amico, G., D'Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Del Popolo, A., Delfino, M., Delgado, J., Mendez, C. Delgado, Depaoli, D., Di Pierro, F., Di Venere, L., Prester, D. Dominis, Donini, A., Dorner, D., Doro, M., Elsaesser, D., Emery, G., Ramazani, V. Fallah, Fariña, L., Fattorini, A., Font, L., Fruck, C., Fukami, S., Fukazawa, Y., López, R. J. García, Garczarczyk, M., Gasparyan, S., Gaug, M., Paiva, J. G. Giesbrecht, Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Grau, R., Green, D., Green, J. G., Hadasch, D., Hahn, A., Hassan, T., Heckmann, L., Herrera, J., Hoang, J., Hrupec, D., Hütten, M., Imazawa, R., Inada, T., Iotov, R., Ishio, K., Martínez, I. Jiménez, Jormanainen, J., Kerszberg, D., Kobayashi, Y., Kubo, H., Kushida, J., Lamastra, A., Lelas, D., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Lorini, A., Lyard, E., Fraga, B. Machado de Oliveira, Majumdar, P., Makariev, M., Maneva, G., Mang, N., Manganaro, M., Mangano, S., Mannheim, K., Mariotti, M., Martínez, M., Aguilar, A. Mas, Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., Molina, E., Mondal, H. A., Moralejo, A., Morcuende, D., Moreno, V., Nakamori, T., Nanci, C., Nava, L., Neustroev, V., Rosillo, M. Nievas, Nigro, C., Nilsson, K., Nishijima, K., Ekoume, T. Njoh, Noda, K., Nozaki, S., Ohtani, Y., Oka, T., Okumura, A., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavletić, L., Persic, M., Pihet, M., Pirola, G., Podobnik, F., Moroni, P. G. Prada, Prandini, E., Principe, G., Priyadarshi, C., Puljak, I., Rhode, W., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Sahakyan, N., Saito, T., Sakurai, S., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schmuckermaier, F., Schubert, J. L., Schweizer, T., Sitarek, J., Sliusar, V., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Tajima, H., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terauchi, K., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., van Scherpenberg, J., Acosta, M. Vazquez, Ventura, S., Verguilov, V., Viale, I., Vigorito, C. F., Vitale, V., Vovk, I., Walter, R., Will, M., Wunderlich, C., Yamamoto, T., Zarić, D., Abdalla, H., Aharonian, F., Benkhali, F. Ait, Angüner, E. O., Ashkar, H., Backes, M., Baghmanyan, V., Martins, V. Barbosa, Batzofin, R., Becherini, Y., Berge, D., Bernlöhr, K., Böttcher, M., Boisson, C., Bolmont, J., de Lavergne, M. de Bony, Bradascio, F., Breuhaus, M., Brose, R., Brun, F., Bulik, T., Bylund, T., Cangemi, F., Caroff, S., Casanova, S., Cerruti, M., Chand, T., Chandra, S., Chen, A., Chibueze, O. U., Cotter, G., Cristofari, P., Mbarubucyeye, J. Damascene, Devin, J., Djannati-Ataï, A., Dmytriiev, A., Egberts, K., Ernenwein, J. -P., Fiasson, A., de Clairfontaine, G. Fichet, Fontaine, G., Füßling, M., Funk, S., Gabici, S., Ghafourizadeh, S., Giavitto, G., Glawion, D., Glicenstein, J. F., Goswami, P., Grolleron, G., Hinton, J. A., Hörbe, M., Hoischen, C., Holch, T. L., Holler, M., Horns, D., Huang, Zhiqiu, Jamrozy, M., Jankowsky, F., Joshi, V., Jung-Richardt, I., Kasai, E., Katarzyński, K., Katz, U., Khélifi, B., Kluźniak, W., Komin, Nu., Kosack, K., Kostunin, D., Lang, R. G., Stum, S. Le, Lemière, A., Lemoine-Goumard, M., Lenain, J. -P., Leuschner, F., Lohse, T., Luashvili, A., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marandon, V., Marchegiani, P., Martí-Devesa, G., Marx, R., Maurin, G., Meyer, M., Mitchell, A., Moderski, R., Mohrmann, L., Montanari, A., Moulin, E., Muller, J., Murach, T., Nakashima, K., de Naurois, M., Nayerhoda, A., Niemiec, J., Noel, A. Priyana, O'Brien, P., Ohm, S., Olivera-Nieto, L., Wilhelmi, E. de Ona, Ostrowski, M., Panny, S., Panter, M., Parsons, R. D., Poireau, V., Prokhorov, D. A., Prokoph, H., Pühlhofer, G., Punch, M., Quirrenbach, A., Reichherzer, P., Reimer, A., Reimer, O., Renaud, M., Rieger, F., Rowell, G., Rudak, B., Ricarte, H. Rueda, Ruiz-Velasco, E., Sahakian, V., Salzmann, H., Santangelo, A., Sasaki, M., Schäfer, J., Schüssler, F., Schutte, H. M., Schwanke, U., Shapopi, J. N. S., Sol, H., Specovius, A., Spencer, S., Stawarz, Ł., Steenkamp, R., Steinmassl, S., Steppa, C., Sushch, I., Suzuki, H., Takahashi, T., Tanaka, T., Thorpe-Morgan, C., Tluczykont, M., Tomankova, L., Tsuji, N., Uchiyama, Y., van Eldik, C., van Soelen, B., Vecchi, M., Veh, J., Venter, C., Vink, J., Wagner, S. J., White, R., Wierzcholska, A., Wong, Yu Wun, Yusafzai, A., Zacharias, M., Zanin, R., Zargaryan, D., Zdziarski, A. A., Zech, A., Zhu, S. J., Zouari, S., Żywucka, N., Acharyya, A., Adams, C. B., Batista, P., Benbow, W., Capasso, M., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M, Fortson, L., Furniss, A., Gent, A., Hanlon, W. F, Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kherlakian, M., Kleiner, T. K., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E., Millis, J., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Park, N., Patel, S. R., Pfrang, K., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Saha, L., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Tak, D., Tucci, J. V., Weinstein, A., Williams, D. A., Williamson, T. J., Bosch-Ramon, V., Celma, C., Linares, M., Russell, D. M., and Sala, G.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

MAXI J1820+070 is a low-mass X-ray binary with a black hole as a compact object. This binary underwent an exceptionally bright X-ray outburst from March to October 2018, showing evidence of a non-thermal particle population through its radio emission during this whole period. The combined results of 59.5 hours of observations of the MAXI J1820+070 outburst with the H.E.S.S., MAGIC and VERITAS experiments at energies above 200 GeV are presented, together with Fermi-LAT data between 0.1 and 500 GeV, and multiwavelength observations from radio to X-rays. Gamma-ray emission is not detected from MAXI J1820+070, but the obtained upper limits and the multiwavelength data allow us to put meaningful constraints on the source properties under reasonable assumptions regarding the non-thermal particle population and the jet synchrotron spectrum. In particular, it is possible to show that, if a high-energy gamma-ray emitting region is present during the hard state of the source, its predicted flux should be at most a factor of 20 below the obtained Fermi-LAT upper limits, and closer to them for magnetic fields significantly below equipartition. During the state transitions, under the plausible assumption that electrons are accelerated up to ~ 500 GeV, the multiwavelength data and the gamma-ray upper limits lead consistently to the conclusion that a potential high-energy and very-high-energy gamma-ray emitting region should be located at a distance from the black hole ranging between 10^11 and 10^13 cm. Similar outbursts from low-mass X-ray binaries might be detectable in the near future with upcoming instruments such as CTA., Comment: 15 pages, 5 figures. Accepted for publication in MNRAS

Published
2022
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10. The throughput calibration of the VERITAS telescopes

Author

Adams, C. B., Benbow, W., Brill, A., Buckley, J. H., Christiansen, J. L., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M, Fortson, L., Furniss, A., Giuri, C., Hanna, D., Hassan, T., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kleiner, T. K, Kumar, S., Lang, M. J., Lundy, M., Maier, G., Moriarty, P., Mukherjee, R., Rosillo, M. Nievas, O'Brien, S., Park, N., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Weinstein, A., Williams, D. A., and Williamson, T. J

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Context. The response of imaging atmospheric Cherenkov telescopes to incident {\gamma}-ray-initiated showers in the atmosphere changes as the telescopes age due to exposure to light and weather. These aging processes affect the reconstructed energies of the events and {\gamma}-ray fluxes. Aims. This work discusses the implementation of signal calibration methods for the Very Energetic Radiation Imaging Telescope Array System (VERITAS) to account for changes in the optical throughput and detector performance over time. Methods. The total throughput of a Cherenkov telescope is the product of camera-dependent factors, such as the photomultiplier tube gains and their quantum efficiencies, and the mirror reflectivity and Winston cone response to incoming radiation. This document summarizes different methods to determine how the camera gains and mirror reflectivity have evolved over time and how we can calibrate this changing throughput in reconstruction pipelines for imaging atmospheric Cherenkov telescopes. The implementation is validated against seven years of observations with the VERITAS telescopes of the Crab Nebula, which is a reference object in very-high-energy astronomy. Results. Regular optical throughput monitoring and the corresponding signal calibrations are found to be critical for the reconstruction of extensive air shower images. The proposed implementation is applied as a correction to the signals of the photomultiplier tubes in the telescope simulation to produce fine-tuned instrument response functions. This method is shown to be effective for calibrating the acquired {\gamma}-ray data and for recovering the correct energy of the events and photon fluxes. At the same time, it keeps the computational effort of generating Monte Carlo simulations for instrument response functions affordably low., Comment: 19 pages, 20 figures, 2 tables Received: 22 September 2021 / Accepted: 03 November 2021

Published
2021
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11. Variability and Spectral Characteristics of Three Flaring Gamma-ray Quasars Observed by VERITAS and Fermi-LAT

Author

Adams, C. B., Batshoun, J., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Cavins, B., Christiansen, J. L., Coppi, P., Errando, M., Farrell, K. A, Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Giuri, C., Hanna, D., Hassan, T., Hervet, O., Holder, J., Houck, M., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Krennrich, F., Kumar, S., Lundy, M., Maier, G., McGrath, C. E, Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Oppenheimer, A., Otte, A. N., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Rhatigan, A., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Sembroski, G. H., Williams, D. A., Williamson, T. J, Valverde, J., Horan, D., Buson, S., Cheung, C. C., Ciprini, S., Gasparrini, D., Ojha, R., van Zyl, P., and Sironi, L.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Flat spectrum radio quasars (FSRQs) are the most luminous blazars at GeV energies, but only rarely emit detectable fluxes of TeV gamma rays, typically during bright GeV flares. We explore the gamma-ray variability and spectral characteristics of three FSRQs that have been observed at GeV and TeV energies by Fermi-LAT and VERITAS, making use of almost 100 hours of VERITAS observations spread over 10 years: 3C 279, PKS 1222+216, and Ton 599. We explain the GeV flux distributions of the sources in terms of a model derived from a stochastic differential equation describing fluctuations in the magnetic field in the accretion disk, and estimate the timescales of magnetic flux accumulation and stochastic instabilities in their accretion disks. We identify distinct flares using a procedure based on Bayesian blocks and analyze their daily and sub-daily variability and gamma-ray energy spectra. Using observations from VERITAS as well as Fermi, Swift, and the Steward Observatory, we model the broadband spectral energy distributions of PKS 1222+216 and Ton 599 during VHE-detected flares in 2014 and 2017, respectively, strongly constraining the jet Doppler factors and gamma-ray emission region locations during these events. Finally, we place theoretical constraints on the potential production of PeV-scale neutrinos during these VHE flares., Comment: 34 pages, 13 figures. Accepted for publication in the Astrophysical Journal

Published
2021
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12. Multi-Wavelength Observation Campaign of the TeV Gamma-Ray Binary HESS J0632+057 with NuSTAR, VERITAS, MDM, and Swift

Author

Tokayer, Y. M., An, H., Halpern, J. P., Kim, J., Mori, K., Hailey, C. J., Adams, C. B., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Errando, M., Falcone, A., Farrell, K. A, Foote, G. M, Fortson, L., Furniss, A., Gent, A., Giuri, C., Hanna, D., Hassan, T., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Lang, M. J., Maier, G., McGrath, C. E, Moriarty, P., Mukherjee, R., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Schlenstedt, S., Sembroski, G. H., Weinstein, A., Williams, D. A., and Williamson, T. J

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

HESS J0632+057 belongs to a rare subclass of binary systems which emits gamma-rays above 100 GeV. It stands out for its distinctive high-energy light curve, which features a sharp ``primary'' peak and broader ``secondary'' peak. We present the results of contemporaneous observations by NuSTAR and VERITAS during the secondary peak between Dec. 2019 and Feb. 2020, when the orbital phase ($\phi$) is between 0.55 and 0.75. NuSTAR detected X-ray spectral evolution, while VERITAS detected TeV emission. We fit a leptonic wind-collision model to the multi-wavelength spectra data obtained over the four NuSTAR and VERITAS observations, constraining the pulsar spin-down luminosity and the magnetization parameter at the shock. Despite long-term monitoring of the source from Oct. 2019 to Mar. 2020, the MDM observatory did not detect significant variation in H$\alpha$ and H$\beta$ line equivalent widths, an expected signature of Be-disk interaction with the pulsar. Furthermore, fitting folded Swift-XRT light curve data with an intra-binary shock model constrained the orbital parameters, suggesting two orbital phases (at $\phi_D = 0.13$ and 0.37) where the pulsar crosses the Be-disk, as well as phases for the periastron ($\phi_0 = 0.30$) and inferior conjunction ($\phi_{\text{IFC}} = 0.75$). The broad-band X-ray spectra with Swift-XRT and NuSTAR allowed us to measure a higher neutral hydrogen column density at one of the predicted disk-passing phases., Comment: 21 pages, 9 figures, accepted to ApJ

Published
2021
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13. Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes

Author

Adams, C. B., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Chromey, A. J., Errando, M., Falcone, A., Farrell, K. A., Feng, Q., Finley, J P., Foote, G., Fortson, L., Furniss, A., Gent, A., Gillanders, G. H., Giuri, C., Gueta, O., Hanna, D., Hassan, T., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Krennrich, F., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E., Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Patel, S., Pfrang, K., Pichel, A., Pohl, M., Prado, R. R., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Rovero, A. C., Ryan, J. L., Santander, M., Schlenstedt, S., Sembroski, G. H., Shang, R., Tak, D., Vassiliev, V. V., Weinstein, A., Williams, D. A., Williamson, T. J., Acciari, V. A., Ansoldi, S., Antonelli, L. A., Engels, A. Arbet, Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., de Almeida, U. Barres, Barrio, J. A., Batković, I., González, J. Becerra, Bednarek, W., Bellizzi, L., Bernardini, E., Bernardos, M., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Biland, A., Blanch, O., Bökenkamp, H., Bonnol, G., Bošnjak, Ž., Busetto, G., Carosi, R., Ceribella, G., Cerruti, M., Chai, Y., Chilingarian, A., Cikota, S., Colak, S. M., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D'Amico, G., D'Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Delfino, M., Delgado, J., Mendez, C. Delgado, Depaoli, D., Di Pierro, F., Di Venere, L., Espiñeira, E. Do Souto, Prester, D. Dominis, Donini, A., Dorner, D., Doro, M., Elsaesser, D., Ramazani, V. Fallah, Fattorini, A., Fonseca, M. V., Font, L., Fruck, C., Fukami, S., Fukazawa, Y., López, R. J. García, Garczarczyk, M., Gasparyan, S., Gaug, M., Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Green, J. G., Green, D., Hadasch, D., Hahn, A., Heckmann, L., Herrera, J., Hoang, J., Hrupec, D., Hütten, M., Inada, T., Ishio, K., Iwamura, Y., Martínez, I. Jiménez, Jormanainen, J., Jouvin, L., Karjalainen, M., Kerszberg, D., Kobayashi, Y., Kubo, H., Kushida, J., Lamastra, A., Lelas, D., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Fraga, B. Machado de Oliveira, Maggio, C., Majumdar, P., Makariev, M., Mallamaci, M., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., Molina, E., Moralejo, A., Morcuende, D., Moreno, V., Moretti, E., Nakamori, T., Nava, L., Neustroev, V., Nigro, C., Nilsson, K., Nishijima, K., Nozaki, K. Noda S., Ohtani, Y., Oka, T., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavletić, L., Peñil, P., Persic, M., Pihet, M., Moroni, P. G. Prada, Prandini, E., Priyadarshi, C., Puljak, I., Rhode, W., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Saha, L., Sahakyan, N., Saito, T., Sakurai, S., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schweizer, T., Sitarek, J., Šnidarić, I., Spolon, D. Sobczynska A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., van Scherpenberg, J., Vanzo, G., Acosta, M. Vazquez, Ventura, S., Verguilov, V., Vigorito, C. F., Vitale, V., Vovk, I., Will, M., Wunderlich, C., Yamamoto, T., Zarić, D., Abdalla, H., Aharonian, F., Ait-Benkhali, F., Anguener, O., Arcaro, C., Ashkar, H., Backes, M., Martins, V. Barbosa, Barnard, M., Batzofin, R., Becherini, Y., Berge, D., Bernloehr, K., Bi, B., Boettcher, M., Boisson, C., Bolmont, J., de Bony, M., Breuhaus, M., Brose, R., Brun, F., Bulik, T., Caroff, S., Casanova, S., Chand, T., Chen, A., Cotter, G., Mbarubucyeye, J. Damascene, Devin, J., Djannati-Atai, A., Egberts, K., Ernenwein, J., Fegan, S., Fiasson, A., de Clairfontaine, G. Fichet, Fontaine, G., Fuessling, M., Funk, S., Gabici, S., Giavitto, G., Glawion, D., Glicenstein, J., Grondin, M., Hinton, J., Hofmann, W., Holch, T., Holler, M., Horns, D., Huang, Z., Jamrozy, M., Jankowsky, F., Joshi, V., Jung-Richardt, I., Kasai, E., Katarzynski, K., Khelifi, B., Komin, N., Kosack, K., Kostunin, D., Stum, S. Le, Lemiere, A., Lenain, J., Leuschner, F., Levy, C., Lohse, T., Luashvili, A., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marandon, V., Marchegiani, P., Marcowith, A., Marti'i-Devesa, G., Marx, R., Maurin, G., Meintjes, P., Mitchell, A., Moderski, R., Mohrmann, L., Montanari, A., Moulin, E., Muller, J., Murach, T., de Naurois, M., Nayerhoda, A., Niemiec, J., Noel, A., O'Brien, P., Ohm, S., Olivera-Nieto, L., de Ona-Wilhelmi, E., Ostrowski, M., Panny, S., Panter, M., Parsons, D., Peron, G., Poireau, V., Prokhorov, D., Prokoph, H., Puehlhofer, G., Punch, M., Quirrenbach, A., Reichherzer, P., Reimer, A., Reimer, O., Renaud, M., Rieger, F., Romoli, C., Rowell, G., Rudak, B., Ricarte, H. Rueda, Velasco, E. Ruiz, Sahakian, V., Sailer, S., Salzmann, H., Sanchez, D., Santangelo, A., Sasaki, M., Schuessler, F., Schutte, H., Schwanke, U., Senniappan, M., Shapopi, J., Simoni, R., Sol, H., Specovius, A., Spencer, S., Steenkamp, R., Steinmassl, S., Sun, L., Takahashi, T., Tanaka, T., Terrier, R., Tsuji, N., Uchiyama, Y., van Eldik, C., van Soelen, B., Veh, J., Venter, C., Vink, J., Wagner, S., White, R., Wierzcholska, A., Wong, Y. W., Zacharias, M., Zargaryan, D., Zdziarski, A., Zech, A., Zhu, S., Zouari, S., Zywucka, N., Moritani, Y., and Torres, D. F.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The results of gamma-ray observations of the binary system HESS J0632+057 collected during 450 hours over 15 years, between 2004 and 2019, are presented. Data taken with the atmospheric Cherenkov telescopes H.E.S.S., MAGIC, and VERITAS at energies above 350 GeV were used together with observations at X-ray energies obtained with Swift-XRT, Chandra, XMM-Newton, NuSTAR, and Suzaku. Some of these observations were accompanied by measurements of the H{\alpha} emission line. A significant detection of the modulation of the VHE gamma-ray fluxes with a period of 316.7+-4.4 days is reported, consistent with the period of 317.3+-0.7 days obtained with a refined analysis of X-ray data. The analysis of data of four orbital cycles with dense observational coverage reveals short timescale variability, with flux-decay timescales of less than 20 days at very high energies. Flux variations observed over the time scale of several years indicate orbit-to-orbit variability. The analysis confirms the previously reported correlation of X-ray and gamma-ray emission from the system at very high significance, but can not find any correlation of optical H{\alpha} parameters with X-ray or gamma-ray energy fluxes in simultaneous observations. The key finding is that the emission of HESS J0632+057 in the X-ray and gamma-ray energy bands is highly variable on different time scales. The ratio of gamma-ray to X-ray flux shows the equality or even dominance of the gamma-ray energy range. This wealth of new data is interpreted taking into account the insufficient knowledge of the ephemeris of the system, and discussed in the context of results reported on other gamma-ray binary systems., Comment: Accepted for publication by The Astrophysical Journal

Published
2021
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14. VERITAS contributions to the 37th International Cosmic Ray Conference

Author

Adams, C. B., Archer, A., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Farrell, K. A., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Gillanders, G. H., Giuri, C., Gueta, O., Hanna, D., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kleiner, T. K., Kumar, S., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E, Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Otte, A. N., Patel, S. R., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Santander, M., Sembroski, G. H., Shang, R., Tak, D., Vassiliev, V. V., Weinstein, A., Williams, D. A., and Williamson, T. J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Compilation of papers presented by the VERITAS Collaboration at the 37th International Cosmic Ray Conference (ICRC), held July 12 through July 23, 2021 (online) in Berlin, Germany., Comment: html page. 2021 ICRC, Berlin, Germany

Published
2021

15. A Search for TeV Gamma-ray Emission from Pulsar Tails by VERITAS

Author

Benbow, Wystan, Brill, A., Buckley, James, Capasso, M, Chromey, A, Errando, M., Falcone, Abraham, Farrell, K. A., Feng, Qi, Finley, J, Foote, G. M., Fortson, Lucy, Furniss, Amy, Gent, Alasdair, Giuri, C, Hanna, David, Hassan, Tarek, Hervet, Olivier, Holder, Jamie, Hughes, G, Humensky, T. B., Jin, Weidong, Kaaret, Philip, Kargaltsev, Oleg, Kertzman, Mary P., Kieda, David, Klingler, Noel, Kumar, Sajan, Lang, M, Lundy, M, Maier, Gernot, McGrath, C. E., Moriarty, Patrick, Mukherjee, Reshmi, Nieto, D, Nievas-Rosillo, M, O'Brien, S, Ong, Rene A., Otte, A. N., Patel, S., Pfrang, Konstantin, Pohl, Martin, Prado, Raul, Quinn, John, Ragan, Kenneth J., Reynolds, T., Ribeiro, D, Richards, G. T., Roache, Emmet Thomas, Ryan, James, Santander, Marcos, Sembroski, Glenn H, Shang, R, Volkov, Igor, Wakely, S. P, Weinstein, Amanda, Wilcox, P., and Williams, D. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on the search for very-high-energy gamma-ray emission from the regions around three nearby supersonic pulsars (PSR B0355+54, PSR J0357+3205 and PSR J1740+1000) that exhibit long X-ray tails. To date there is no clear detection of TeV emission from any pulsar tail that is prominent in X-ray or radio. We provide upper limits on the TeV flux, and luminosity, and also compare these limits with other pulsar wind nebulae detected in X-rays and the tail emission model predictions. We find that at least one of the three tails is likely to be detected in observations that are a factor of 2-3 more sensitive. The analysis presented here also has implications for deriving the properties of pulsar tails, for those pulsars whose tails could be detected in TeV., Comment: 21 pages, 6 figures

Published
2021
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16. Detection of the Crab Nebula with the 9.7 m Prototype Schwarzschild-Couder Telescope

Author

Adams, C. B., Alfaro, R., Ambrosi, G., Ambrosio, M., Aramo, C., Arlen, T., Batista, P. I., Benbow, W., Bertucci, B., Bissaldi, E., Biteau, J., Bitossi, M., Boiano, A., Bonavolontà, C., Bose, R., Bouvier, A., Brill, A., Brown, A. M., Buckley, J. H., Byrum, K., Cameron, R. A., Canestrari, R., Capasso, M., Caprai, M., Covault, C. E., Depaoli, D., Errando, M., Fegan, S., Feng, Q., Fiandrini, E., Foote, G., Fortin, P., Funk, S., Furniss, A., Garfias, F., Gent, A., Giglietto, N., Giordano, F., Giro, E., González, M. M., Guarino, V., Halliday, R., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Ionica, M., Iriarte, A., Jin, W., Johnson, C. A., Kaaret, P., Kieda, D., Kim, B., Kuznetsov, A., Lapington, J. S., Licciulli, F., Loporchio, S., Mason, V., Meagher, K., Meures, T., Mode, B. A. W., Mognet, S. A. I., Mukherjee, R., Nguyen, T., Nieto, D., Okumura, A., Otte, N., La Palombara, N., Pantaleo, F. R., Paoletti, R., Pareschi, G., Petrashyk, A., Di Pierro, F., Pueschel, E., Reynolds, P. T., Ribeiro, D., Richards, G., Roache, E., Ross, D., Rousselle, J., Rugliancich, A., Ruíz-Díaz-Soto, J., Santander, M., Schlenstedt, S., Schneider, M., Scuderi, S., Shang, R., Sironi, G., Stevenson, B., Stiaccini, L., Tajima, H., Taylor, L. P., Thornhill, J., Tosti, L., Tovmassian, G., Vagelli, V., Valentino, M., Vandenbroucke, J., Vassiliev, V. V., Di Venere, L., Wakely, S. P., Watson, J. J., White, R., Wilcox, P., Williams, D. A., Wood, M., Yu, P., and Zink, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Schwarzschild-Couder Telescope (SCT) is a telescope concept proposed for the Cherenkov Telescope Array. It employs a dual-mirror optical design to remove comatic aberrations over an $8^{\circ}$ field of view, and a high-density silicon photomultiplier camera (with a pixel resolution of 4 arcmin) to record Cherenkov emission from cosmic ray and gamma-ray initiated particle cascades in the atmosphere. The prototype SCT (pSCT), comprising a 9.7 m diameter primary mirror and a partially instrumented camera with 1536 pixels, has been constructed at the Fred Lawrence Whipple Observatory. The telescope was inaugurated in January 2019, with commissioning continuing throughout 2019. We describe the first campaign of observations with the pSCT, conducted in January and February of 2020, and demonstrate the detection of gamma-ray emission from the Crab Nebula with a statistical significance of $8.6\sigma$., Comment: 13 pages, 12 figures, 3 tables, submitted to Astroparticle Physics

Published
2020
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17. Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A

Author

Acharyya, A., primary, Adams, C. B., additional, Archer, A., additional, Bangale, P., additional, Bartkoske, J. T., additional, Batista, P., additional, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Christiansen, J. L., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, Feng, Q., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Hanlon, W., additional, Hanna, D., additional, Hervet, O., additional, Hinrichs, C. E., additional, Hoang, J., additional, Holder, J., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kherlakian, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Korzoun, N., additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Millard, M. J., additional, Millis, J., additional, Mooney, C. L., additional, Moriarty, P., additional, Mukherjee, R., additional, O’Brien, S., additional, Ong, R. A., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Sadeh, I., additional, Sadun, A. C., additional, Saha, L., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Splettstoesser, M., additional, Talluri, A. Kaushik, additional, Tucci, J. V., additional, Vassiliev, V. V., additional, Weinstein, A., additional, Williams, D. A., additional, Wong, S. L., additional, Woo, J., additional, Aharonian, F., additional, Aschersleben, J., additional, Backes, M., additional, Martins, V. Barbosa, additional, Batzofin, R., additional, Becherini, Y., additional, Berge, D., additional, Bernlöhr, K., additional, Bi, B., additional, Böttcher, M., additional, Boisson, C., additional, Bolmont, J., additional, de Bony de Lavergne, M., additional, Borowska, J., additional, Bouyahiaoui, M., additional, Bradascio, F., additional, Breuhaus, M., additional, Brose, R., additional, Brun, F., additional, Bruno, B., additional, Bulik, T., additional, Burger-Scheidlin, C., additional, Caroff, S., additional, Casanova, S., additional, Cecil, R., additional, Celic, J., additional, Cerruti, M., additional, Chand, T., additional, Chandra, S., additional, Chen, A., additional, Chibueze, J., additional, Chibueze, O., additional, Cotter, G., additional, Dai, S., additional, Mbarubucyeye, J. Damascene, additional, Djannati-Ataï, A., additional, Dmytriiev, A., additional, Doroshenko, V., additional, Einecke, S., additional, Ernenwein, J.-P., additional, de Clairfontaine, G. Fichet, additional, Filipovic, M., additional, Fontaine, G., additional, Füßling, M., additional, Funk, S., additional, Gabici, S., additional, Ghafourizadeh, S., additional, Giavitto, G., additional, Glawion, D., additional, Glicenstein, J. F., additional, Goswami, P., additional, Grolleron, G., additional, Haerer, L., additional, Hinton, J. A., additional, Holch, T. L., additional, Holler, M., additional, Horns, D., additional, Jamrozy, M., additional, Jankowsky, F., additional, Joshi, V., additional, Jung-Richardt, I., additional, Kasai, E., additional, Katarzyński, K., additional, Khatoon, R., additional, Khélifi, B., additional, Klepser, S., additional, Kluźniak, W., additional, Kosack, K., additional, Kostunin, D., additional, Lang, R. G., additional, Le Stum, S., additional, Lemière, A., additional, Lenain, J.-P., additional, Leuschner, F., additional, Lohse, T., additional, Luashvili, A., additional, Lypova, I., additional, Mackey, J., additional, Malyshev, D., additional, Marandon, V., additional, Marchegiani, P., additional, Marcowith, A., additional, Martí-Devesa, G., additional, Marx, R., additional, Mitchell, A., additional, Moderski, R., additional, Mohrmann, L., additional, Montanari, A., additional, Moulin, E., additional, Murach, T., additional, Nakashima, K., additional, Niemiec, J., additional, Noel, A. Priyana, additional, O’Brien, P., additional, Olivera-Nieto, L., additional, de Ona Wilhelmi, E., additional, Ostrowski, M., additional, Panny, S., additional, Panter, M., additional, Peron, G., additional, Prokhorov, D. A., additional, Pühlhofer, G., additional, Punch, M., additional, Quirrenbach, A., additional, Reichherzer, P., additional, Reimer, A., additional, Reimer, O., additional, Ren, H., additional, Renaud, M., additional, Rieger, F., additional, Rudak, B., additional, Ruiz-Velasco, E., additional, Sahakian, V., additional, Santangelo, A., additional, Sasaki, M., additional, Schäfer, J., additional, Schüssler, F., additional, Schutte, H. M., additional, Schwanke, U., additional, Shapopi, J. N. S., additional, Specovius, A., additional, Spencer, S., additional, Stawarz, Ł., additional, Steenkamp, R., additional, Steinmassl, S., additional, Sushch, I., additional, Suzuki, H., additional, Takahashi, T., additional, Tanaka, T., additional, Terrier, R., additional, van Eldik, C., additional, Vecchi, M., additional, Veh, J., additional, Venter, C., additional, Vink, J., additional, White, R., additional, Wierzcholska, A., additional, Wong, Yu Wun, additional, Zacharias, M., additional, Zargaryan, D., additional, Zdziarski, A. A., additional, Zech, A., additional, Zouari, S., additional, Żywucka, N., additional, and Mori, K., additional

Published
2023
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18. A VERITAS/Breakthrough Listen Search for Optical Technosignatures

Author

Acharyya, A., primary, Adams, C. B., additional, Archer, A., additional, Bangale, P., additional, Batista, P., additional, Benbow, W., additional, Brill, A., additional, Capasso, M., additional, Errando, M., additional, Falcone, A., additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Griffin, S., additional, Hanlon, W., additional, Hanna, D., additional, Hervet, O., additional, Hinrichs, C. E., additional, Hoang, J., additional, Holder, J., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kherlakian, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Korzoun, N., additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E., additional, Millard, M. J., additional, Miller, H. R., additional, Millis, J., additional, Mooney, C. L., additional, Moriarty, P., additional, Mukherjee, R., additional, O’Brien, S., additional, Ong, R. A., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. L., additional, Sadeh, I., additional, Saha, L., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Tak, D., additional, Talluri, A. K., additional, Tucci, J. V., additional, Vazquez, N., additional, Williams, D. A., additional, Wong, S. L., additional, Woo, J., additional, DeBoer, D., additional, Isaacson, H., additional, de Pater, I., additional, Price, D. C., additional, and Siemion, A., additional

Published
2023
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20. VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations

Author

Acharyya, A., primary, Adams, C. B., additional, Archer, A., additional, Bangale, P., additional, Benbow, W., additional, Brill, A., additional, Christiansen, J. L., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Hanlon, W., additional, Hanna, D., additional, Hervet, O., additional, Hinrichs, C. E., additional, Hoang, J., additional, Holder, J., additional, Jin, W., additional, Johnson, M. N., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Korzoun, N., additional, Krennrich, F., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Millard, M. J., additional, Millis, J., additional, Mooney, C. L., additional, Moriarty, P., additional, Mukherjee, R., additional, O’Brien, S., additional, Ong, R. A., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Sadeh, I., additional, Sadun, A. C., additional, Saha, L., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Splettstoesser, M., additional, Talluri, A. K., additional, Tucci, J. V., additional, Vassiliev, V. V., additional, Williams, D. A., additional, Wong, S. L., additional, Hovatta, Talvikki, additional, Jorstad, Svetlana G., additional, Kiehlmann, Sebastian, additional, Lähteenmäki, Anne, additional, Liodakis, Ioannis, additional, Marscher, Alan P., additional, Max-Moerbeck, Walter, additional, Readhead, Anthony C. S., additional, Reeves, Rodrigo, additional, Smith, Paul S., additional, and Tornikoski, Merja, additional

Published
2023
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21. Evaluating user experience with immersive technology in simulation-based education: A modified Delphi study with qualitative analysis.

Author

Bandyopadhyay, S, Jacobs, C, Foote, G, Williams, M, Bandyopadhyay, S, Jacobs, C, Foote, G, and Williams, M

Abstract

BACKGROUND: Immersive technology is becoming more widespread in simulation-based medical education with applications that both supplement and replace traditional teaching methods. There is a lack of validated measures that capture user experience to inform of the technology utility. We aimed to establish a consensus of items and domains that different simulation experts would include in a measure for immersive technology use. METHODS: A 3-stage modified Delphi using online software was conducted to support the conceptual framework for the proposed measure. The first round was informed by prior work on immersive technology in simulation. In the first round, participants were asked to describe what we could measure in simulation-based education and technology. Thematic analysis generated key themes that were presented to the participants in the second round. Ranking of importance in round 2 was determined by mean rank scores. The final round was an online meeting for final consensus discussion and most important domains by experts were considered. RESULTS: A total of 16 simulation experts participated in the study. A consensus was reached on the ideal measure in immersive technology simulation that would be a user questionnaire and domains of interest would be: what was learnt, the degree of immersion experienced, fidelity provided, debrief, psychological safety and patient safety. No consensus was reached with the barriers that this technology introduces in education. CONCLUSIONS: There is varied opinion on what we should prioritise in measuring the experience in simulation practice. Importantly, this study identified key areas that aids our understanding on how we can measure new technology in educational settings. Synthesising these results in to a multidomain instrument requires a systematic approach to testing in future research.

Published
2023

22. VERITAS discovery of very high energy gamma-ray emission from S3 1227+25 and multiwavelength observations

Author

Acharyya, A., Adams, C. B., Archer, A., Bangale, P., Benbow, W., Brill, A., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gallagher, G., Hanlon, W., Hanna, D., Hervet, O., Hinrichs, C. E., Hoang, J., Holder, J., Jin, W., Johnson, M. N., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Korzoun, N., Krennrich, F., Lang, M. J., Lundy, M., Maier, G., McGrath, C. E., Millard, M. J., Millis, J., Mooney, C. L., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Sadeh, I., Sadun, A. C., Saha, L., Santander, M., Sembroski, G. H., Shang, R., Splettstoesser, M., Talluri, A. Kaushik, Tucci, J. V., Vassiliev, V. V., Williams, D. A., Wong, S. L., Hovatta, Talvikki, Jorstad, Svetlana G., Kiehlmann, Sebastian, Lähteenmäki, Anne, Liodakis, Ioannis, Marscher, Alan P., Max-Moerbeck, Walter, Readhead, Anthony C. S., Reeves, Rodrigo, Smith, Paul S., Tornikoski, Merja, and VERITAS Collaboration

Subjects
VHE [gamma ray], model [emission], FOS: Physical sciences, GeV, power spectrum, GLAST, emission: model, blazar, emission [gamma ray], synchrotron, flux [gamma ray], optical, gamma ray: flux, High Energy Astrophysical Phenomena (astro-ph.HE), variability, imaging [detector], photon, detector: imaging, polarization: monitoring, monitoring [polarization], gamma ray: emission, gamma ray: VHE, correlation, ddc:520, spectral, VERITAS, Astrophysics - High Energy Astrophysical Phenomena, spectral energy distribution
Abstract

The astrophysical journal / 1 950(2), 152 (2023). doi:10.3847/1538-4357/acd2d0, We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the detection of a hard-spectrum GeV flare on 2015 May 15 with the Fermi-Large Area Telescope (LAT). A combined 5 hr VERITAS exposure on May 16 and 18 resulted in a strong 13σ detection with a differential photon spectral index, Γ = 3.8 ± 0.4, and a flux level at 9% of the Crab Nebula above 120 GeV. This also triggered target-of-opportunity observations with Swift, optical photometry, polarimetry, and radio measurements, also presented in this work, in addition to the VERITAS and Fermi-LAT data. A temporal analysis of the gamma-ray flux during this period finds evidence of a shortest variability timescale of τ$_{obs}$ = 6.2 ± 0.9 hr, indicating emission from compact regions within the jet, and the combined gamma-ray spectrum shows no strong evidence of a spectral cutoff. An investigation into correlations between the multiwavelength observations found evidence of optical and gamma-ray correlations, suggesting a single-zone model of emission. Finally, the multiwavelength spectral energy distribution is well described by a simple one-zone leptonic synchrotron self-Compton radiation model., Published by Institute of Physics Publ., London

Published
2023
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23. VERITAS and Fermi-LAT Constraints on the Gamma-Ray Emission from Superluminous Supernovae SN2015bn and SN2017egm

Author

Acharyya, A., primary, Adams, C. B., additional, Bangale, P., additional, Benbow, W., additional, Buckley, J. H., additional, Capasso, M., additional, Dwarkadas, V. V., additional, Errando, M., additional, Falcone, A., additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Gent, A., additional, Hanlon, W. F, additional, Hervet, O., additional, Holder, J., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kherlakian, M., additional, Kieda, D., additional, Kleiner, T. K, additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Millis, J., additional, Moriarty, P., additional, Mukherjee, R., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Patel, S. R., additional, Pfrang, K., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. L., additional, Sadeh, I., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Splettstoesser, M., additional, Tak, D., additional, Tucci, J. V., additional, Weinstein, A., additional, Williams, D. A., additional, Metzger, B. D., additional, Nicholl, M., additional, and Vurm, I., additional

Published
2023
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24. Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS

Author

Acharyya, A., primary, Archer, A., additional, Bangale, P., additional, Bartkoske, J. T., additional, Batista, P., additional, Baumgart, M., additional, Benbow, W., additional, Buckley, J. H., additional, Falcone, A., additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Hanlon, W. F., additional, Hervet, O., additional, Hoang, J., additional, Holder, J., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kherlakian, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Korzoun, N., additional, Krennrich, F., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Moriarty, P., additional, O’Brien, S., additional, Ong, R. A., additional, Pfrang, K., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Roache, E., additional, Rodd, N. L., additional, Ryan, J. L., additional, Sadeh, I., additional, Saha, L., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Splettstoesser, M., additional, Tak, D., additional, Tucci, J. V., additional, Vassiliev, V. V., additional, and Williams, D. A., additional

Published
2023
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25. VTSCat: The VERITAS Catalog of Gamma-Ray Observations

Author

Acharyya, A., primary, Adams, C. B., additional, Archer, A., additional, Bangale, P., additional, Bartkoske, J. T., additional, Batista, P., additional, Benbow, W., additional, Brill, A., additional, Brose, R., additional, Buckley, J. H., additional, Capasso, M., additional, Christiansen, J. L., additional, Chromey, A. J., additional, Daniel, M. K., additional, Errando, M., additional, Falcone, A., additional, Farrell, K. A, additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M, additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Gent, A., additional, Giuri, C., additional, Gueta, O., additional, Hanlon, W. F, additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Hoang, J., additional, Holder, J., additional, Hughes, G., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Korzoun, N., additional, Krennrich, F., additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Millard, M. J, additional, Mooney, C. L., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, A. N., additional, Pandel, D., additional, Park, N., additional, Patel, S. R., additional, Patel, S., additional, Pfrang, K., additional, Pichel, A., additional, Pohl, M., additional, Prado, R. R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Richards, G. T., additional, Roache, E., additional, Rovero, A. C., additional, Rulten, C., additional, Ryan, J. L., additional, Sadeh, I., additional, Santander, M., additional, Schlenstedt, S., additional, Sembroski, G. H., additional, Shang, R., additional, Splettstoesser, M., additional, Stevenson, B., additional, Tak, D., additional, Vassiliev, V. V., additional, Wakely, S. P., additional, Weinstein, A., additional, Williams, D. A., additional, Williamson, T. J, additional, Angelini, L., additional, Basu-Zych, A., additional, Sabol, E., additional, and Smale, A., additional

Published
2023
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26. Multiwavelength Observations of the Blazar VER J0521+211 during an Elevated TeV Gamma-Ray State

Author

Adams, C. B., primary, Batista, P., additional, Benbow, W., additional, Brill, A., additional, Brose, R., additional, Buckley, J. H., additional, Capasso, M., additional, Christiansen, J. L., additional, Errando, M., additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gallagher, G., additional, Gent, A., additional, Giuri, C., additional, Hanlon, W. F., additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Hughes, G., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Krennrich, F., additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, Millis, J., additional, Moriarty, P., additional, Mukherjee, R., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, A. N., additional, Patel, S., additional, Patel, S. R., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R. R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. L., additional, Sadeh, I., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Stevenson, B., additional, Tucci, J. V., additional, Vassiliev, V. V., additional, Wakely, S. P., additional, Weinstein, A., additional, Wells, R. M., additional, Williams, D. A., additional, Williamson, T. J., additional, Acciari, V. A., additional, Aniello, T., additional, Ansoldi, S., additional, Antonelli, L. A., additional, Engels, A. Arbet, additional, Arcaro, C., additional, Artero, M., additional, Asano, K., additional, Baack, D., additional, Babić, A., additional, Baquero, A., additional, de Almeida, U. Barres, additional, Barrio, J. A., additional, Batković, I., additional, González, J. Becerra, additional, Bednarek, W., additional, Bernardini, E., additional, Bernardos, M., additional, Berti, A., additional, Besenrieder, J., additional, Bhattacharyya, W., additional, Bigongiari, C., additional, Biland, A., additional, Blanch, O., additional, Bökenkamp, H., additional, Bonnoli, G., additional, Bošnjak, Ž., additional, Burelli, I., additional, Busetto, G., additional, Carosi, R., additional, Ceribella, G., additional, Cerruti, M., additional, Chai, Y., additional, Chilingarian, A., additional, Cikota, S., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, D’Amico, G., additional, D’Elia, V., additional, Vela, P. Da, additional, Dazzi, F., additional, Angelis, A. De, additional, Lotto, B. De, additional, Popolo, A. Del, additional, Delfino, M., additional, Delgado, J., additional, Mendez, C. Delgado, additional, Depaoli, D., additional, Pierro, F. Di, additional, Venere, L. Di, additional, Souto Espiñeira, E. Do, additional, Prester, D. Dominis, additional, Donini, A., additional, Dorner, D., additional, Doro, M., additional, Elsaesser, D., additional, Ramazani, V. Fallah, additional, Fariña, L., additional, Fattorini, A., additional, Font, L., additional, Fruck, C., additional, Fukami, S., additional, Fukazawa, Y., additional, López, R. J. García, additional, Garczarczyk, M., additional, Gasparyan, S., additional, Gaug, M., additional, Giglietto, N., additional, Giordano, F., additional, Gliwny, P., additional, Godinović, N., additional, Green, J. G., additional, Green, D., additional, Hadasch, D., additional, Hahn, A., additional, Heckmann, L., additional, Herrera, J., additional, Hrupec, D., additional, Hütten, M., additional, Inada, T., additional, Iotov, R., additional, Ishio, K., additional, Iwamura, Y., additional, Martínez, I. Jiménez, additional, Jormanainen, J., additional, Jouvin, L., additional, Kerszberg, D., additional, Kobayashi, Y., additional, Kubo, H., additional, Kushida, J., additional, Lamastra, A., additional, Lelas, D., additional, Leone, F., additional, Lindfors, E., additional, Linhoff, L., additional, Lombardi, S., additional, Longo, F., additional, López-Coto, R., additional, López-Moya, M., additional, López-Oramas, A., additional, Loporchio, S., additional, Lorini, A., additional, de Oliveira Fraga, B. Machado, additional, Maggio, C., additional, Majumdar, P., additional, Makariev, M., additional, Maneva, G., additional, Manganaro, M., additional, Mannheim, K., additional, Mariotti, M., additional, Martínez, M., additional, Aguilar, A. Mas, additional, Mazin, D., additional, Menchiari, S., additional, Mender, S., additional, Mićanović, S., additional, Miceli, D., additional, Miener, T., additional, Miranda, J. M., additional, Mirzoyan, R., additional, Molina, E., additional, Mondal, H. A., additional, Moralejo, A., additional, Morcuende, D., additional, Moreno, V., additional, Nakamori, T., additional, Nanci, C., additional, Nava, L., additional, Neustroev, V., additional, Rosillo, M. Nievas, additional, Nigro, C., additional, Nilsson, K., additional, Nishijima, K., additional, Noda, K., additional, Nozaki, S., additional, Ohtani, Y., additional, Oka, T., additional, Otero-Santos, J., additional, Paiano, S., additional, Palatiello, M., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Pavletić, L., additional, Peñil, P., additional, Persic, M., additional, Pihet, M., additional, Moroni, P. G. Prada, additional, Prandini, E., additional, Priyadarshi, C., additional, Puljak, I., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Righi, C., additional, Rugliancich, A., additional, Sahakyan, N., additional, Saito, T., additional, Sakurai, S., additional, Satalecka, K., additional, Saturni, F. G., additional, Schleicher, B., additional, Schmidt, K., additional, Schmuckermaier, F., additional, Schubert, J. L., additional, Schweizer, T., additional, Sitarek, J., additional, Šnidarić, I., additional, Sobczynska, D., additional, Spolon, A., additional, Stamerra, A., additional, Strišković, J., additional, Strom, D., additional, Strzys, M., additional, Suda, Y., additional, Surić, T., additional, Takahashi, M., additional, Takeishi, R., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Teshima, M., additional, Tosti, L., additional, Truzzi, S., additional, Tutone, A., additional, Ubach, S., additional, Scherpenberg, J. van, additional, Vanzo, G., additional, Acosta, M. Vazquez, additional, Ventura, S., additional, Verguilov, V., additional, Viale, I., additional, Vigorito, C. F., additional, Vitale, V., additional, Vovk, I., additional, Will, M., additional, Wunderlich, C., additional, Yamamoto, T., additional, and Zarić, D., additional

Published
2022
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27. Combined dark matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

Author

Charles, E., Di Mauro, M., Giuri, C., Salazar-Gallegos, D., Zitzer, B., Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., Angeles Camacho, J. R., Arteaga-Velázquez, J. C., Arunbabu, K. P., Avila Rojas, D., Ayala Solares, H. A., Babu, R., Baghmanyan, V., Barber, A. S., Becerra Gonzalez, J., Belmont-Moreno, E., Benzvi, S. Y., Berley, D., Brisbois, C., Caballero-Mora, K. S., Capistrán, T., Carramiñana, A., Casanova, S., Chaparro-Amaro, O., Cotti, U., Cotzomi, J., Coutiño León, S., La Fuente, E., León, C., Diaz-Cruz, L., Diaz Hernandez, R., Díaz-Vélez, J. C., Dingus, B. L., Durocher, M., Duvernois, M. A., Ellsworth, R. W., Engel, K., Espinoza, C., Fan, K. L., Fang, K., Fernández Alonso, M., Fick, B., Fleischhack, H., Flores, J. L., Fraija, N. I., Garcia, D., García-González, J. A., García-Luna, J. L., García-Torales, G., Garfias, F., Giacinti, G., Goksu, H., González, M. M., Goodman, J. A., Harding, J. P., Hernandez, S., Herzog, I., Hinton, J., Hona, B., Huang, D., Hueyotl-Zahuantitla, F., Hui, C. M., Humensky, B., Hüntemeyer, P., Iriarte, A., Jardin-Blicq, A., Jhee, H., Joshi, V., Kieda, D., Kunde, G. J., Kunwar, S., Lara, A., Lee, J., Lee, W. H., Lennarz, D., León Vargas, H., Linnemann, J., Longinotti, A. L., López-Coto, R., Luis-Raya, G., Lundeen, J., Malone, K., Marandon, V., Martinez, O., Martinez-Castellanos, I., Martínez-Huerta, H., Martínez-Castro, J., Matthews, J. A. J., Mcenery, J., Miranda-Romagnoli, P., Morales-Soto, J. A., Moreno, E., Mostafá, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Olivera-Nieto, L., Omodei, N., Peisker, A., Pérez Araujo, Y., Pérez-Pérez, E. G., Rho, C. D., Rivière, C., Rosa-Gonzalez, D., Ruiz-Velasco, E., Ryan, J., Salazar, H., Salesa Greus, F., Sandoval, A., Schneider, M., Schoorlemmer, H., Serna-Franco, J., Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tanner, M., Tollefson, K., Torres, I., Torres-Escobedo, R., Turner, R., Ureña-Mena, F., Villaseñor, L., Wang, X., Watson, I. J., Weisgarber, T., Werner, F., Willox, E., Wood, J., Yodh, G. B., Zepeda, A., Zhou, H., Abdallah, H., Adam, R., Aharonian, F., Ait Benkhali, F., Angüner, E. O., Arcaro, C., Armand, C., Armstrong, T., Ashkar, H., Backes, M., Barbosa Martins, V., Barnacka, A., Barnard, M., Becherini, Y., Berge, D., Bernlöhr, K., Bi, B., Böttcher, M., Boisson, C., Bolmont, J., Bony Lavergne, M., Breuhaus, M., Brun, F., Brun, P., Bryan, M., Büchele, M., Bulik, T., Bylund, T., Caroff, S., Carosi, A., Chand, T., Chandra, S., Chen, A., Cotter, G., Curyło, M., Damascene Mbarubucyeye, J., Davids, I. D., Davies, J., Deil, C., Devin, J., Dewilt, P., Dirson, L., Djannati-Ataï, A., Dmytriiev, A., Donath, A., Doroshenko, V., Duffy, C., Dyks, J., Egberts, K., Eichhorn, F., Einecke, S., Emery, G., Ernenwein, J. -P, Feijen, K., Fegan, S., Fiasson, A., Fichet Clairfontaine, G., Fontaine, G., Funk, S., Füßling, M., Gabici, S., Gallant, Y. A., Giavitto, G., Giunti, L., Glawion, D., Glicenstein, J. F., Gottschall, D., Grondin, M. -H, Hahn, J., Haupt, M., Hermann, G., Hinton, J. A., Hofmann, W., Hoischen, C., Holch, T. L., Holler, M., Hörbe, M., Horns, D., Huber, D., Jamrozy, M., Jankowsky, D., Jankowsky, F., Jung-Richardt, I., Kasai, E., Kastendieck, M. A., Katarzyński, K., Katz, U., Khangulyan, D., Khélifi, B., Klepser, S., Kluźniak, W., Komin, Nu, Konno, R., Kosack, K., Kostunin, D., Kreter, M., Lamanna, G., Lemière, A., Lemoine-Goumard, M., Lenain, J. -P, Levy, C., Lohse, T., Lypova, I., Mackey, J., Majumdar, J., Malyshev, D., Marchegiani, P., Marcowith, A., Mares, A., Martì-Devesa, G., Marx, R., Maurin, G., Meintjes, P. J., Meyer, M., Moderski, R., Mohamed, M., Mohrmann, L., Montanari, A., Moore, C., Morris, P., Moulin, E., Muller, J., Murach, T., Nakashima, K., Naurois, M., Ndiyavala, H., Niederwanger, F., Niemiec, J., Oakes, L., O’brien, P., Odaka, H., Ohm, S., Ona Wilhelmi, E., Ostrowski, M., Panter, M., Panny, S., Parsons, R. D., Peron, G., Peyaud, B., Piel, Q., Pita, S., Poireau, V., Priyana Noel, A., Prokhorov, D. A., Prokoph, H., Pühlhofer, G., Punch, M., Quirrenbach, A., Raab, S., Rauth, R., Reichherzer, P., Reimer, A., Reimer, O., Remy, Q., Renaud, M., Rieger, F., Rinchiuso, L., Romoli, C., Rowell, G., Rudak, B., Sahakian, V., Sailer, S., Sanchez, D. A., Santangelo, A., Sasaki, M., Scalici, M., Schüssler, F., Schutte, H. M., Schwanke, U., Schwemmer, S., Seglar-Arroyo, M., Senniappan, M., Seyffert, A. S., Shafi, N., Shiningayamwe, K., Simoni, R., Sinha, A., Sol, H., Specovius, A., Spencer, S., Spir-Jacob, M., Stawarz, Ł., Sun, L., Steenkamp, R., Stegmann, C., Steinmassl, S., Steppa, C., Takahashi, T., Tavernier, T., Taylor, A. M., Terrier, R., Tiziani, D., Tluczykont, M., Tomankova, L., Trichard, C., Tsirou, M., Tuffs, R., Uchiyama, Y., Walt, D. J., Eldik, C., Rensburg, C., Soelen, B., Vasileiadis, G., Veh, J., Venter, C., Vincent, P., Vink, J., Völk, H. J., Vuillaume, T., Wadiasingh, Z., Wagner, S. J., Watson, J., White, R., Wierzcholska, A., Wong, Y. W., Yusafzai, A., Zacharias, M., Zanin, R., Zargaryan, D., Zdziarski, A. A., Zech, A., Zhu, S., Zorn, J., Zouari, S., Z̀ywucka, N., Acciari, V. A., Ansoldi, S., Antonelli, L. A., Arbet Engels, A., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., Barres Almeida, U., Barrio, J. A., Batković, I., Becerra González, J., Bednarek, W., Bellizzi, L., Bernardini, E., Bernardos, M., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Biland, A., Blanch, O., Bökenkamp, H., Bonnoli, G., Bošnjak, Ž, Busetto, G., Carosi, R., Ceribella, G., Cerruti, M., Chai, Y., Chilingarian, A., Cikota, S., Colak, S. M., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D’amico, G., D’elia, V., Da Vela, P., Dazzi, F., Angelis, A., Lotto, B., Delfino, M., Delgado, J., Delgado Mendez, C., Depaoli, D., Di Pierro, F., Di Venere, L., Do Souto Espiñeira, E., Do-Minis Prester, D., Donini, A., Dorner, D., Doro, M., Elsaesser, D., Fallah Ramazani, V., Fattorini, A., Fonseca, M. V., Font, L., Fruck, C., Fukami, S., Fukazawa, Y., García López, R. J., Garczarczyk, M., Gasparyan, S., Gaug, M., Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Green, J. G., Green, D., Hadasch, D., Hahn, A., Heckmann, L., Herrera, J., Hoang, J., Hrupec, D., Hütten, M., Inada, T., Ishio, K., Iwamura, Y., Jiménez Martínez, I., Jormanainen, J., Jouvin, L., Karjalainen, M., Kerszberg, D., Kobayashi, Y., Kubo, H., Kushida, J., Lamastra, A., Lelas, D., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Moya, M., López-Oramas, A., Loporchio, S., Machado Oliveira Fraga, B., Maggio, C., Majumdar, P., Makariev, M., Mallamaci, M., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., Molina, E., Moralejo, A., Morcuende, D., Moreno, V., Moretti, E., Nakamori, T., Nava, L., Neustroev, V., Nigro, C., Nilsson, K., Nishijima, K., Noda, K., Nozaki, S., Ohtani, Y., Oka, T., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavletić, L., Peñil, P., Persic, M., Pihet, M., Prada Moroni, P. G., Prandini, E., Priyadarshi, C., Puljak, I., Rhode, W., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Sahakyan, N., Saito, T., Sakurai, S., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schweizer, T., Sitarek, J., Šnidarić, I., Dorota Sobczynska, Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., Scherpenberg, J., Vanzo, G., Vazquez Acosta, M., Ventura, S., Verguilov, V., Vigorito, C. F., Vitale, V., Vovk, I., Will, M., Wunderlich, C., Yamamoto, T., Zarić, D., Adams, C. B., Archer, A., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Farrell, A., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Gillanders, G. H., Gueta, O., Hanna, D., Hervet, O., Holder, J., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kleiner, T. K., Kumar, S., Lang, M. J., Lundy, M., Maier, G., Mcgrath, C. E., Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O’brien, S., Ong, R. A., Otte, A. N., Patel, S. R., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Santander, M., Sembroski, G. H., Shang, R., Tak, D., Vassiliev, V. V., Weinstein, A., Williams, D. A., Williamson, T. J., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Hess, HAWC, VERITAS, MAGIC, H.E.S.S., Fermi-LAT, Naurois , Mathieu, Ona-Wilhelmi , Emma, and Bony , Mathieu

Subjects
data analysis method, talk: Berlin 2021/07/15, FOS: Physical sciences, dark matter: signature, dark matter: direct detection, WIMP: dark matter, channel cross section: upper limit, annihilation [dark matter], GLAST, High Energy Physics - Experiment, dark matter [WIMP], WIMP: annihilation, High Energy Physics - Experiment (hep-ex), Tellurium compounds, Germanium compounds, HESS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Dark Matter, ddc:530, annihilation [WIMP], ComputingMilieux_MISCELLANEOUS, direct detection [dark matter], High Energy Astrophysical Phenomena (astro-ph.HE), energy: high, upper limit [channel cross section], background, Gamma rays, dark matter: annihilation, Berlin 2021/07/15 [talk], sensitivity, Galaxies, Maximum likelihood estimation, MAGIC, mass dependence, Dark matter searches, high [energy], VERITAS, galaxy, signature [dark matter], Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], HAWC, experimental results
Abstract

Cosmological and astrophysical observations suggest that 85% of the total matter of the Universe is made of Dark Matter (DM). However, its nature remains one of the most challenging and fundamental open questions of particle physics. Assuming particle DM, this exotic form of matter cannot consist of Standard Model (SM) particles. Many models have been developed to attempt unraveling the nature of DM such as Weakly Interacting Massive Particles (WIMPs), the most favored particle candidates. WIMP annihilations and decay could produce SM particles which in turn hadronize and decay to give SM secondaries such as high energy γ rays. In the framework of indirect DM search, observations of promising targets are used to search for signatures of DM annihilation. Among these, the dwarf spheroidal galaxies (dSphs) are commonly favored owing to their expected high DM content and negligible astrophysical background. In this work, we present the very first combination of 20 dSph observations, performed by the Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS collaborations in order to maximize the sensitivity of DM searches and improve the current results. We use a joint maximum likelihood approach combining each experiment’s individual analysis to derive more constraining upper limits on the WIMP DM self-annihilation cross-section as a function of DM particle mass. We present new DM constraints over the widest mass range ever reported, extending from 5 GeV to 100 TeV thanks to the combination of these five different γ-ray instruments., PoS: Proceedings of Science, 395, ISSN:1824-8039, Proceedings of 37th International Cosmic Ray Conference

Published
2022
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28. Variability and Spectral Characteristics of Three Flaring Gamma-Ray Quasars Observed by VERITAS and Fermi-LAT

Author

Adams, C. B., Batshoun, J., Farrell, K. A., Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Giuri, Chiara, Hanna, D., Hassan Collado, Tarek, Benbow, W., Hervet, O., Holder, J., Houck, M., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Krennrich, F., Kumar, S., Brill, A., Lundy, M., Maier, G., McGrath, C. E., Moriarty, P., Mukherjee, R., Nieto, D., Nievas Rosillo, Mireia, O'Brien, S., Ong, R. A., Oppenheimer, A., Buckley, J. H., Otte, A. N., Patel, S., Pfrang, Konstantin Johannes, Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Rhatigan, A., Capasso, M., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Sembroski, G. H., Williams, D. A., Williamson, T. J., Valverde, J., Horan, D., Buson, S., Cavins, B., Cheung, C. C., Ciprini, S., Gasparrini, D., Ojha, R., van Zyl, P., Sironi, L., VERITAS Collaboration, Fermi-LAT Collaboration, Christiansen, J. L., Coppi, P., Errando, M., Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), VERITAS, and Fermi-LAT

Subjects
Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, magnetic field, Astrophysics::Cosmology and Extragalactic Astrophysics, stochastic [differential equations], GeV, 030226 pharmacology & pharmacy, 01 natural sciences, 7. Clean energy, gamma ray: energy spectrum, Bayesian, GLAST, VHE, blazar, neutrino: production, 03 medical and health sciences, 0302 clinical medicine, accretion, production [neutrino], emission [gamma ray], 0103 physical sciences, TeV, differential equations: stochastic, quasar, 010303 astronomy & astrophysics, energy spectrum [gamma ray], High Energy Astrophysical Phenomena (astro-ph.HE), fluctuation, Astronomy and Astrophysics, stability, Doppler effect, observatory, gamma ray: emission, 13. Climate action, Space and Planetary Science, flux: magnetic, magnetic [flux], ddc:520, spectral, VERITAS, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena
Abstract

The astrophysical journal 924(2), 95 (2022). doi:10.3847/1538-4357/ac32bd, Flat-spectrum radio quasars (FSRQs) are the most luminous blazars at GeV energies but only rarely emit detectable fluxes of TeV gamma rays, typically during bright GeV flares. We explore the gamma-ray variability and spectral characteristics of three FSRQs that have been observed at GeV and TeV energies by Fermi-LAT and VERITAS, making use of almost 100 hr of VERITAS observations spread over 10 yr: 3C 279, PKS 1222+216, and Ton 599. We explain the GeV flux distributions of the sources in terms of a model derived from a stochastic differential equation describing fluctuations in the magnetic field in the accretion disk and estimate the timescales of magnetic flux accumulation and stochastic instabilities in their accretion disks. We identify distinct flares using a procedure based on Bayesian blocks and analyze their daily and subdaily variability and gamma-ray energy spectra. Using observations from VERITAS, as well as Fermi, Swift, and the Steward Observatory, we model the broadband spectral energy distributions of PKS 1222+216 and Ton 599 during very high energy (VHE)���detected flares in 2014 and 2017, respectively, strongly constraining the jet Doppler factors and gamma-ray emission region locations during these events. Finally, we place theoretical constraints on the potential production of PeV-scale neutrinos during these VHE flares., Published by Univ., Chicago, Ill. [u.a.]

Published
2022
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29. The throughput calibration of the VERITAS telescopes

Author

Adams, C. B., Benbow, W., Brill, A., Buckley, J. H., Christiansen, J. L., Falcone, A., Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Giuri, C., Hanna, D., Hassan, T., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kleiner, T. K., Kumar, S., Lang, M. J., Lundy, M., Maier, G., Moriarty, P., Mukherjee, R., Rosillo, M. Nievas, O'Brien, S., Park, N., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Weinstein, A., Williams, D. A., and Williamson, T. J.

Subjects
numerical calculations, Monte Carlo, atmosphere [Cherenkov counter], damage, time dependence, techniques: image processing, optical, mirror, High Energy Astrophysical Phenomena (astro-ph.HE), photomultiplier, image processing [techniques], performance [detector], imaging [detector], photon, Astrophysics::Instrumentation and Methods for Astrophysics, Throughput calibration, Monte Carlo [numerical calculations], detector: imaging, efficiency: quantum, time dependence [damage], astroparticle physics, VERITAS, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, numerical calculations: Monte Carlo, atmosphere [showers], efficiency, quantum, Cherenkov counter, atmosphere, detector: performance, air, Astrophysics::High Energy Astrophysical Phenomena, tube, FOS: Physical sciences, Cherenkov telescopes, Cherenkov counter: atmosphere, damage: time dependence, VHE, Instrument Response Functions, Instrumentation and Methods for Astrophysics (astro-ph.IM), quantum [efficiency], detector, imaging, showers, atmosphere, detectors [instrumentation], detector, performance, showers: atmosphere, instrumentation: detectors, telescopes, calibration, monitoring, gamma ray, ddc:520
Abstract

Astronomy and astrophysics 658, A83 (2022). doi:10.1051/0004-6361/202142275, Context. The response of imaging air Cherenkov telescopes to incident $γ$-ray-initiated showers in the atmosphere changes as the telescopes age due to exposure to light and weather. These aging processes affect the reconstructed energies of the events and $γ$-ray fluxes.Aims. This work discusses the implementation of signal calibration methods for the Very Energetic Radiation Imaging Telescope Array System (VERITAS) to account for changes in the optical throughput and detector performance over time. Methods. The total throughput of a Cherenkov telescope is the product of camera-dependent factors, such as the photomultiplier tube gains and their quantum efficiencies, and the mirror reflectivity and Winston cone response to incoming radiation. This document summarizes different methods to determine how the camera gains and mirror reflectivity have evolved over time and how we can calibrate this changing throughput in reconstruction pipelines for imaging air cherenkov telescopes. The implementation is validated against seven years of observations with the VERITAS telescopes of the Crab Nebula, which is a reference object in very-high-energy astronomy.Results. Regular optical throughput monitoring and the corresponding signal calibrations are found to be critical for the reconstruction of extensive air shower images. The proposed implementation is applied as a correction to the signals of the photomultiplier tubes in the telescope simulation to produce fine-tuned instrument response functions. This method is shown to be effective for calibrating the acquired $γ$-ray data and for recovering the correct energy of the events and photon fluxes. At the same time, it keeps the computational effort of generating Monte Carlo simulations for instrument response functions affordably low., Published by EDP Sciences, Les Ulis

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2022
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30. Variability and Spectral Characteristics of Three Flaring Gamma-Ray Quasars Observed by VERITAS and Fermi-LAT

Author

Adams, C. B., primary, Batshoun, J., additional, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Cavins, B., additional, Christiansen, J. L., additional, Coppi, P., additional, Errando, M., additional, Farrell, K. A, additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Giuri, C., additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Holder, J., additional, Houck, M., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Krennrich, F., additional, Kumar, S., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Oppenheimer, A., additional, Otte, A. N., additional, Patel, S., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R. R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Rhatigan, A., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. L., additional, Santander, M., additional, Sembroski, G. H., additional, Williams, D. A., additional, Williamson, T. J, additional, Valverde, J., additional, Horan, D., additional, Buson, S., additional, Cheung, C. C., additional, Ciprini, S., additional, Gasparrini, D., additional, Ojha, R., additional, van Zyl, P., additional, and Sironi, L., additional

Published
2022
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31. Multiwavelength Observation Campaign of the TeV Gamma-Ray Binary HESS J0632 + 057 with NuSTAR, VERITAS, MDM, and Swift

Author

Tokayer, Y. M., primary, An, H., additional, Halpern, J. P., additional, Kim, J., additional, Mori, K., additional, Hailey, C. J., additional, Adams, C. B., additional, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Errando, M., additional, Falcone, A., additional, Farrell, K. A, additional, Foote, G. M, additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Giuri, C., additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Lang, M. J., additional, Maier, G., additional, McGrath, C. E, additional, Moriarty, P., additional, Mukherjee, R., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, A. N., additional, Park, N., additional, Patel, S., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R. R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. L., additional, Santander, M., additional, Schlenstedt, S., additional, Sembroski, G. H., additional, Weinstein, A., additional, Williams, D. A., additional, and Williamson, T. J, additional

Published
2021
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32. Observation of the Gamma-Ray Binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS Telescopes

Author

Adams, C. B., primary, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, A Farrell, K., additional, Feng, Q., additional, Finley, J. P., additional, M Foote, G., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Gillanders, G. H., additional, Giuri, C., additional, Gueta, O., additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, K Kleiner, T., additional, Krennrich, F., additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, E McGrath, C., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, A. N., additional, Park, N., additional, Patel, S., additional, Pfrang, K., additional, Pichel, A., additional, Pohl, M., additional, Prado, R. R., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Rovero, A. C., additional, Ryan, J. L., additional, Santander, M., additional, Schlenstedt, S., additional, Sembroski, G. H., additional, Shang, R., additional, Tak, D., additional, Vassiliev, V. V., additional, Weinstein, A., additional, Williams, D. A., additional, J Williamson, T., additional, Acciari, V. A., additional, Ansoldi, S., additional, Antonelli, L. A., additional, Arbet Engels, A., additional, Artero, M., additional, Asano, K., additional, Baack, D., additional, Babić, A., additional, Baquero, A., additional, Barres de Almeida, U., additional, Barrio, J. A., additional, Batković, I., additional, Becerra González, J., additional, Bednarek, W., additional, Bellizzi, L., additional, Bernardini, E., additional, Bernardos, M., additional, Berti, A., additional, Besenrieder, J., additional, Bhattacharyya, W., additional, Bigongiari, C., additional, Biland, A., additional, Blanch, O., additional, Bökenkamp, H., additional, Bonnoli, G., additional, Bošnjak, Ž., additional, Busetto, G., additional, Carosi, R., additional, Ceribella, G., additional, Cerruti, M., additional, Chai, Y., additional, Chilingarian, A., additional, Cikota, S., additional, Colak, S. M., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, D’Amico, G., additional, D’Elia, V., additional, Da Vela, P., additional, Dazzi, F., additional, De Angelis, A., additional, De Lotto, B., additional, Delfino, M., additional, Delgado, J., additional, Delgado Mendez, C., additional, Depaoli, D., additional, Di Pierro, F., additional, Di Venere, L., additional, Do Souto Espiñeira, E., additional, Dominis Prester, D., additional, Donini, A., additional, Dorner, D., additional, Doro, M., additional, Elsaesser, D., additional, Fallah Ramazani, V., additional, Fattorini, A., additional, Fonseca, M. V., additional, Font, L., additional, Fruck, C., additional, Fukami, S., additional, Fukazawa, Y., additional, García López, R. J., additional, Garczarczyk, M., additional, Gasparyan, S., additional, Gaug, M., additional, Giglietto, N., additional, Giordano, F., additional, Gliwny, P., additional, Godinović, N., additional, Green, J. G., additional, Green, D., additional, Hadasch, D., additional, Hahn, A., additional, Heckmann, L., additional, Herrera, J., additional, Hoang, J., additional, Hrupec, D., additional, Hütten, M., additional, Inada, T., additional, Ishio, K., additional, Iwamura, Y., additional, Jiménez Martínez, I., additional, Jormanainen, J., additional, Jouvin, L., additional, Karjalainen, M., additional, Kerszberg, D., additional, Kobayashi, Y., additional, Kubo, H., additional, Kushida, J., additional, Lamastra, A., additional, Lelas, D., additional, Leone, F., additional, Lindfors, E., additional, Linhoff, L., additional, Lombardi, S., additional, Longo, F., additional, López-Coto, R., additional, López-Moya, M., additional, López-Oramas, A., additional, Loporchio, S., additional, Machado de Oliveira Fraga, B., additional, Maggio, C., additional, Majumdar, P., additional, Makariev, M., additional, Mallamaci, M., additional, Maneva, G., additional, Manganaro, M., additional, Mannheim, K., additional, Maraschi, L., additional, Mariotti, M., additional, Martínez, M., additional, Mazin, D., additional, Menchiari, S., additional, Mender, S., additional, Mićanović, S., additional, Miceli, D., additional, Miener, T., additional, Miranda, J. M., additional, Mirzoyan, R., additional, Molina, E., additional, Moralejo, A., additional, Morcuende, D., additional, Moreno, V., additional, Moretti, E., additional, Nakamori, T., additional, Nava, L., additional, Neustroev, V., additional, Nigro, C., additional, Nilsson, K., additional, Nishijima, K., additional, Noda, K., additional, Nozaki, S., additional, Ohtani, Y., additional, Oka, T., additional, Otero-Santos, J., additional, Paiano, S., additional, Palatiello, M., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Pavletić, L., additional, Peñil, P., additional, Persic, M., additional, Pihet, M., additional, Prada Moroni, P. G., additional, Prandini, E., additional, Priyadarshi, C., additional, Puljak, I., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Righi, C., additional, Rugliancich, A., additional, Saha, L., additional, Sahakyan, N., additional, Saito, T., additional, Sakurai, S., additional, Satalecka, K., additional, Saturni, F. G., additional, Schleicher, B., additional, Schmidt, K., additional, Schweizer, T., additional, Sitarek, J., additional, Šnidarić, I., additional, Sobczynska, D., additional, Spolon, A., additional, Stamerra, A., additional, Strišković, J., additional, Strom, D., additional, Strzys, M., additional, Suda, Y., additional, Surić, T., additional, Takahashi, M., additional, Takeishi, R., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Teshima, M., additional, Tosti, L., additional, Truzzi, S., additional, Tutone, A., additional, Ubach, S., additional, van Scherpenberg, J., additional, Vanzo, G., additional, Vazquez Acosta, M., additional, Ventura, S., additional, Verguilov, V., additional, Vigorito, C. F., additional, Vitale, V., additional, Vovk, I., additional, Will, M., additional, Wunderlich, C., additional, Yamamoto, T., additional, Zarić, D., additional, Abdalla, H., additional, Aharonian, F., additional, Ait Benkhali, F., additional, Angüner, E. O., additional, Arcaro, C., additional, Ashkar, H., additional, Backes, M., additional, Barbosa Martins, V., additional, Barnard, M., additional, Batzofin, R., additional, Becherini, Y., additional, Berge, D., additional, Bernlöhr, K., additional, Bi, B., additional, Böttcher, M., additional, Boisson, C., additional, Bolmont, J., additional, de Bony de Lavergne, M., additional, Breuhaus, M., additional, Brose, R., additional, Brun, F., additional, Bulik, T., additional, Caroff, S., additional, Casanova, S., additional, Chand, T., additional, Chen, A., additional, Cotter, G., additional, Damascenev Mbarubucyeye, J., additional, Devin, J., additional, Djannati-Ataï, A., additional, Egberts, K., additional, Ernenwein, J.-P., additional, Fegan, S., additional, Fiasson, A., additional, Fichet de Clairfontaine, G., additional, Fontaine, G., additional, Füßling, M., additional, Funk, S., additional, Gabici, S., additional, Giavitto, G., additional, Glawion, D., additional, Glicenstein, J. F., additional, Grondin, M.-H., additional, Hinton, J. A., additional, Hofmann, W., additional, Holch, T. L., additional, Holler, M., additional, Horns, D., additional, Huang, Zhiqiu, additional, Jamrozy, M., additional, Jankowsky, F., additional, Joshi, V., additional, Jung-Richardt, I., additional, Kasai, E., additional, Katarzyński, K., additional, Khélifi, B., additional, Komin, Nu., additional, Kosack, K., additional, Kostunin, D., additional, Le Stum, S., additional, Lemière, A., additional, Lenain, J.-P., additional, Leuschner, F., additional, Levy, C., additional, Lohse, T., additional, Luashvili, A., additional, Lypova, I., additional, Mackey, J., additional, Majumdar, J., additional, Malyshev, D., additional, Marandon, V., additional, Marchegiani, P., additional, Marcowith, A., additional, Martí-Devesa, G., additional, Marx, R., additional, Maurin, G., additional, Meintjes, P. J., additional, Mitchell, A., additional, Moderski, R., additional, Mohrmann, L., additional, Montanari, A., additional, Moulin, E., additional, Muller, J., additional, Murach, T., additional, de Naurois, M., additional, Nayerhoda, A., additional, Niemiec, J., additional, Priyana Noel, A., additional, O’Brien, P., additional, Ohm, S., additional, Olivera-Nieto, L., additional, de Ona Wilhelmi, E., additional, Ostrowski, M., additional, Panny, S., additional, Panter, M., additional, Parsons, R. D., additional, Peron, G., additional, Poireau, V., additional, Prokhorov, D. A., additional, Prokoph, H., additional, Pühlhofer, G., additional, Punch, M., additional, Quirrenbach, A., additional, Reichherzer, P., additional, Reimer, A., additional, Reimer, O., additional, Renaud, M., additional, Rieger, F., additional, Romoli, C., additional, Rowell, G., additional, Rudak, B., additional, Rueda Ricarte, H., additional, Ruiz-Velasco, E., additional, Sahakian, V., additional, Sailer, S., additional, Salzmann, H., additional, Sanchez, D. A., additional, Santangelo, A., additional, Sasaki, M., additional, Schutte, H. M., additional, Schwanke, U., additional, Schüssler, F., additional, Senniappan, M., additional, Shapopi, J. N. S., additional, Simoni, R., additional, Sol, H., additional, Specovius, A., additional, Spencer, S., additional, Steenkamp, R., additional, Steinmassl, S., additional, Sun, L., additional, Takahashi, T., additional, Tanaka, T., additional, Terrier, R., additional, Tsuji, N., additional, Uchiyama, Y., additional, van Eldik, C., additional, van Soelen, B., additional, Veh, J., additional, Venter, C., additional, Vink, J., additional, Wagner, S. J., additional, White, R., additional, Wierzcholska, A., additional, Wun Wong, Yu, additional, Zacharias, M., additional, Zargaryan, D., additional, Zdziarski, A. A., additional, Zech, A., additional, Zhu, S. J., additional, Zouari, S., additional, Żywucka, N., additional, Moritani, Y., additional, and Torres, D. F., additional

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2021
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33. A Search for TeV Gamma-Ray Emission from Pulsar Tails by VERITAS

Author

Benbow, W., primary, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, Farrell, K. A, additional, Feng, Q., additional, Finley, J. P., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Giuri, C., additional, Hanna, D., additional, Hassan, T., additional, Hervet, O., additional, Holder, J., additional, Hughes, G., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kargaltsev, Oleg, additional, Kertzman, M., additional, Kieda, D., additional, Klingler, Noel, additional, Kumar, S., additional, Lang, M. J., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E, additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, A. N., additional, Patel, S., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R. R., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Richards, G. T., additional, Roache, E., additional, Ryan, J. L., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Volkov, Igor, additional, Wakely, S. P., additional, Weinstein, A., additional, Wilcox, P., additional, and Williams, D. A., additional

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2021
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34. Multi-Messenger observations of the Fermi-LAT blazar 4FGL J0658.6+0636 consistent with an IceCube high-energy neutrino

Author

de Menezes, Raniere, primary, Buson, Sara, additional, Garrappa, Simone, additional, Gokus, Andrea, additional, Kadler, Matthias, additional, Cheung, Teddy, additional, Giroletti, Marcello, additional, Ajello, Marco, additional, Massaro, Francesco, additional, Peña-Herazo, Harold, additional, Schüssler, Fabian, additional, Bernardini, Elisa, additional, Satalecka, Konstancja, additional, Berti, Alessio, additional, Otero-Santos, Jorge, additional, Paggi, Alessandro, additional, Tramacere, Andrea, additional, Ward, Charlotte, additional, Gezari, Suvi, additional, Hämmerich, Steven, additional, Wilms, Joern, additional, Colmar, Werner, additional, Bach, Uwe, additional, Eppel, Florian, additional, Heßdörfer, Jonas, additional, Kraus, Alex, additional, Paraschos, Georgios Filippos, additional, Moldon, Javier, additional, Perez-Torres, Miguel, additional, Agudo, Ivan, additional, Bonnoli, Giacomo, additional, Castro-Tirado, Alberto, additional, Hu, Youdong, additional, CABALLERO-GARCIA, Maria, additional, Fernandez-Garcia, Emilio, additional, Sanchez-Ramirez, Ruben, additional, Coleiro, Alexis, additional, Kouchner, Antoine, additional, Nanci, Cristina, additional, Sheng, Yong, additional, Rajagopal, Meenakshi, additional, Adams, C., additional, Archer, A., additional, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Christiansen, J., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, Farrell, K. A., additional, Feng, Q., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Gillanders, G. H., additional, Giuri, C., additional, Gueta, O., additional, Hanna, D., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, K.~Kleiner, T., additional, Kumar, S., additional, Lang, M., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O'Brien, S., additional, Ong, R. A., additional, Otte, A., additional, Patel, S. R., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. A., additional, Sadeh, I., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Tak, D., additional, Vassiliev, V., additional, Weinstein, A., additional, Williams, D. A., additional, Williamson, T. J., additional, Walters, Richard, additional, and J. Masci, Frank, additional

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2021
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35. The throughput calibration of the VERITAS telescopes

Author

Nievas Rosillo, Mireia, primary, Adams, C., additional, Archer, A., additional, Benbow, W., additional, Brill, A., additional, Buckley, J. H., additional, Capasso, M., additional, Christiansen, J., additional, Chromey, A. J., additional, Errando, M., additional, Falcone, A., additional, Farrell, K. A., additional, Feng, Q., additional, Foote, G. M., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Gillanders, G. H., additional, Giuri, C., additional, Gueta, O., additional, Hanna, D., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Humensky, T. B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Kleiner, T. K., additional, Kumar, S., additional, Lang, M., additional, Lundy, M., additional, Maier, G., additional, McGrath, C. E., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, O'Brien, S., additional, Ong, R. A., additional, Otte, A., additional, R. Patel, S., additional, Patel, S. R., additional, Pfrang, K., additional, Pohl, M., additional, Prado, R., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Ribeiro, D., additional, Roache, E., additional, Ryan, J. A., additional, Sadeh, I., additional, Santander, M., additional, Sembroski, G. H., additional, Shang, R., additional, Tak, D., additional, Vassiliev, V., additional, Weinstein, A., additional, Williams, D. A., additional, and Williamson, T. J., additional

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2021
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36. VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies

Author

Ryan, James, primary, Archer, A., additional, Benbow, W., additional, Brill, A., additional, Capasso, M., additional, Errando, M., additional, Falcone, A., additional, Feng, Q., additional, Fortson, L., additional, Furniss, A., additional, Gent, A., additional, Giuri, C., additional, Gueta, O., additional, Hanna, D., additional, Hervet, O., additional, Holder, J., additional, Hona, B., additional, Jin, W., additional, Kaaret, P., additional, Kertzman, M., additional, Kieda, D., additional, Kumar, S., additional, Lundy, M., additional, Maier, G., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, Nievas-Rosillo, M., additional, O’Brien, S., additional, Pfrang, K., additional, Pohl, M., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Ribeiro, D., additional, Roache, E., additional, Sadeh, I., additional, Santander, M., additional, Shang, R., additional, Tak, D., additional, Weinstein, A., additional, Adams, C., additional, Buckley, J. H., additional, Christiansen, J., additional, Chromey, A. J., additional, Farrell, K. A., additional, Foote, G. M., additional, Gillanders, G. H., additional, Humensky, T. B., additional, Kleiner, T. K., additional, Lang, M., additional, McGrath, C. E., additional, Ong, R. A., additional, Otte, A., additional, Patel, S. R., additional, Prado, R., additional, Reynolds, P. T., additional, Ryan, J. A., additional, Sembroski, G. H., additional, Vassiliev, V., additional, Williams, D. A., additional, and Williamson, T. J., additional

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2021
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37. The throughput calibration of the VERITAS telescopes

Author

Nievas Rosillo, Mireia, Adams, C., Falcone, A., Farrell, K. A., Feng, Q., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Gillanders, G. H., Giuri, C., Gueta, O., Archer, A., Hanna, D., Hervet, O., Holder, J., Hona, B., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Kleiner, T. K., Benbow, W., Kumar, S., Lang, M., Lundy, M., Maier, G., McGrath, C. E., Moriarty, P., Mukherjee, R., Nieto, D., O'Brien, S., Ong, R. A., Brill, A., Otte, A., R. Patel, S., Patel, S. R., Pfrang, K., Pohl, M., Prado, R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Buckley, J. H., Ribeiro, D., Roache, E., Ryan, J. A., Sadeh, I., Santander, M., Sembroski, G. H., Shang, R., Tak, D., Vassiliev, V., Weinstein, A., Capasso, M., Williams, D. A., Williamson, T. J., VERITAS Collaboration, Christiansen, J., Chromey, A. J., and Errando, M.

Subjects
detector: performance, 010504 meteorology & atmospheric sciences, air, atmosphere [Cherenkov counter], Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, FOS: Physical sciences, Cherenkov counter: atmosphere, 01 natural sciences, energy: threshold, Cherenkov [radiation], 0103 physical sciences, optical, Calibration, ddc:530, mirror, 010303 astronomy & astrophysics, Throughput (business), Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation, 0105 earth and related environmental sciences, Remote sensing, photomultiplier, showers: atmosphere, performance [detector], imaging [detector], Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Monte Carlo [numerical calculations], detector: imaging, threshold [energy], radiation: Cherenkov, calibration, Crab Nebula, efficiency, Environmental science, VERITAS, numerical calculations: Monte Carlo, Astrophysics - Instrumentation and Methods for Astrophysics, Energy (signal processing), atmosphere [showers]
Abstract

37th International Cosmic Ray Conference, ICRC 2021, Berlin, online, Germany, 12 Jul 2021 - 23 Jul 2021; Proceedings of Science / International School for Advanced Studies (ICRC2021), 721 (2021). doi:10.22323/1.395.0721, Imaging atmospheric Cherenkov telescopes are continuously exposed to varying weather condi- tions that have short and long-term effects on their response to Cherenkov light from extensive air showers. This work presents the implementation of a throughput calibration method for the VERITAS telescopes taking into account changes in the optical response and detector performance over time. Different methods to measure the total throughput of the instrument, which depend on mirror reflectivites and PMT camera gain and efficiency, are discussed as well as the effect of its evolution on energy thresholds, effective collection areas, and energy reconstruction. The application of this calibration in the VERITAS data analysis chain is discussed, including the validation using Monte Carlo simulations and observations of the Crab Nebula., Published by SISSA, Trieste

Published
2021
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38. Detection of the Crab Nebula with the 9.7 m prototype Schwarzschild-Couder telescope

Author

Adams, C.B., primary, Alfaro, R., additional, Ambrosi, G., additional, Ambrosio, M., additional, Aramo, C., additional, Arlen, T., additional, Batista, P.I., additional, Benbow, W., additional, Bertucci, B., additional, Bissaldi, E., additional, Biteau, J., additional, Bitossi, M., additional, Boiano, A., additional, Bonavolontà, C., additional, Bose, R., additional, Bouvier, A., additional, Brill, A., additional, Brown, A.M., additional, Buckley, J.H., additional, Byrum, K., additional, Cameron, R.A., additional, Canestrari, R., additional, Capasso, M., additional, Caprai, M., additional, Covault, C.E., additional, Depaoli, D., additional, Errando, M., additional, Fegan, S., additional, Feng, Q., additional, Fiandrini, E., additional, Foote, G., additional, Fortin, P., additional, Funk, S., additional, Furniss, A., additional, Garfias, F., additional, Gent, A., additional, Giglietto, N., additional, Giordano, F., additional, Giro, E., additional, González, M.M., additional, Guarino, V., additional, Halliday, R., additional, Hervet, O., additional, Holder, J., additional, Hughes, G., additional, Humensky, T.B., additional, Ionica, M., additional, Iriarte, A., additional, Jin, W., additional, Johnson, C.A., additional, Kaaret, P., additional, Kieda, D., additional, Kim, B., additional, Kuznetsov, A., additional, Lapington, J.S., additional, Licciulli, F., additional, Loporchio, S., additional, Masone, V., additional, Meagher, K., additional, Meures, T., additional, Mode, B.A.W., additional, Mognet, S.A.I., additional, Mukherjee, R., additional, Nguyen, T., additional, Nieto, D., additional, Okumura, A., additional, Otte, N., additional, La Palombara, N., additional, Pantaleo, F.R., additional, Paoletti, R., additional, Pareschi, G., additional, Petrashyk, A., additional, Di Pierro, F., additional, Pueschel, E., additional, Reynolds, P.T., additional, Ribeiro, D., additional, Richards, G., additional, Roache, E., additional, Ross, D., additional, Rousselle, J., additional, Rugliancich, A., additional, Ruíz-Díaz-Soto, J., additional, Santander, M., additional, Schlenstedt, S., additional, Schneider, M., additional, Scuderi, S., additional, Shang, R., additional, Sironi, G., additional, Stevenson, B., additional, Stiaccini, L., additional, Tajima, H., additional, Taylor, L.P., additional, Thornhill, J., additional, Tosti, L., additional, Tovmassian, G., additional, Vagelli, V., additional, Valentino, M., additional, Vandenbroucke, J., additional, Vassiliev, V.V., additional, Di Venere, L., additional, Wakely, S.P., additional, Watson, J.J., additional, White, R., additional, Wilcox, P., additional, Williams, D.A., additional, Wood, M., additional, Yu, P., additional, and Zink, A., additional

Published
2021
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39. Convective dynamics - Panel report

Author

Carbone, Richard, Foote, G. Brant, Moncrieff, Mitch, Gal-Chen, Tzvi, Cotton, William, and Heymsfield, Gerald

Subjects
Meteorology And Climatology
Abstract

Aspects of highly organized forms of deep convection at midlatitudes are reviewed. Past emphasis in field work and cloud modeling has been directed toward severe weather as evidenced by research on tornadoes, hail, and strong surface winds. A number of specific issues concerning future thrusts, tactics, and techniques in convective dynamics are presented. These subjects include; convective modes and parameterization, global structure and scale interaction, convective energetics, transport studies, anvils and scale interaction, and scale selection. Also discussed are analysis workshops, four-dimensional data assimilation, matching models with observations, network Doppler analyses, mesoscale variability, and high-resolution/high-performance Doppler. It is also noted, that, classical surface measurements and soundings, flight-level research aircraft data, passive satellite data, and traditional photogrammetric studies are examples of datasets that require assimilation and integration.

Published
1990

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