VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog

A. U. Abeysekara, A. Archer, W. Benbow, R. Bird,Robert Brose, M. Buchovecky, J. H. Buckley, V. Bugaev,Alisha Chromey,Michael Connolly,Wei Cui, M. K. Daniel,A. Falcone, Q. Feng, J. P. Finley, L. Fortson, A. Furniss,Moritz Hütten, D. Hanna, O. Hervet, J. Holder, G. Hughes, T. B. Humensky,C. A. Johnson,Philip Kaaret, P. Kar, M. Kertzman,D. Kieda,Martin Krause, F. Krennrich,S. Kumar, M. J. Lang, T. T. Y. Lin, S. McArthur,P. Moriarty, R. Mukherjee,S. O’Brien,R. A. Ong,A. N. Otte,N. Park, A. Petrashyk,M. Pohl,E. Pueschel,J. Quinn, K. Ragan, P. T. Reynolds, G. Richards, E. Roache, C. B. Rulten, I. Sadeh, M. Santander, G. H. Sembroski, K. Shahinyan, I. Sushch,J. Tyler, S. P. Wakely, A. J.R. Weinstein, R. M. Wells, P. Wilcox, A. Wilhelm, D. A. Williams, T. J. Williamson, B. Zitzer, S. Abdollahi, M. Ajello,Luca Baldini,G. Barbiellini, D. Bastieri, R. Bellazzini, B. Berenji, E. Bissaldi, R. D. Blandford, R. Bonino, E. Bottacini, T. J. Brandt,Pascal Bruel, R. Buehler,R. A. Cameron, R. Caputo, P. A. Caraveo,Daniel Castro, E. Cavazzuti, E. Charles, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, D. Costantin,S. Cutini, F. D’Ammando,F. de Palma,N. Di Lalla,Mattia Di Mauro,L. Di Venere,A. Domínguez,C. Favuzzi, S. J. Fegan, A. Franckowiak,Yasushi Fukazawa, S. Funk,P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. A. Grenier, L. Guillemot, S. Guiriec, E. Hays,John W. Hewitt, D. Horan, G. Jóhannesson, S. Kensei, M. Kuss,Stefan Larsson, L. Latronico, M. Lemoine‐Goumard, J. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, J. D. Magill, S. Maldera, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko,Michela Negro, E. Nuss, R. Ojha, N. Omodei, M. Orienti,Elena Orlando, M. Palatiello,Vaidehi S. Paliya, D. Paneque, J. S. Perkins, M. Peršić, M. Pesce-Rollins, V. Petrosian, F. Piron, T. A. Porter, G. Principe, S. Rainò, R. Rando,Bindu Rani, M. Razzano, S. Razzaque, A. Reimer, A. Reimer, T. Reposeur, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli, D. J. Suson, H. Tajima, J. B. Thayer, D. J. Thompson, D. F. Torres, G. Tosti, E. Troja, J. Valverde, G. Vianello, M. Vogel, K. S. Wood, M. Yassine, R. Alfaro,C. Álvarez, José David Ruiz Álvarez, R. Arceo, J. C. Arteaga‐Velázquez,D. Avila Rojas,H. A. Ayala Solares, A. Becerril, E. Belmont‐Moreno, S. BenZvi, A. Bernal, J. Braun, C. Brisbois, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova,M. Castillo, U. Cotti, J. Cotzomi,S. Coutiño de León,C. De León,Eduardo de la Fuente, S. Dichiara, B. L. Dingus,Michael DuVernois, Juan Carlos Díaz–Vélez,Kristi Engel, O. Enríquez‐Rivera, D. W. Fiorino, Henrike Fleischhack, N. Fraija, J. A. García-González, F. Garfias,A. González Muñoz,M. M. González, J. A. Goodman, Z. Hampel-Arias,J. Patrick Harding, S. Hernández, A. Hernández-Almada, B. Hona, Filiberto Hueyotl-Zahuantitla, C. M. Hui, P. Hüntemeyer, A. Iriarte, A. Jardin-Blicq,Vikas Joshi, S. Kaufmann, A. Lara, R. Lauer, W. H. Lee, D. Lennarz,H. León Vargas, J. Linnemann, A. L. Longinotti, G. Luis-Raya, R. Luna-García, R. López-Coto, K. Malone, S. S. Marinelli,O. Martı́nez, I. Martínez-Castellanos, J. Martínez-Castro, H. Martínez-Huerta,John Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafá, A. Nayerhoda, Lukas Nellen, M. Newbold,Mehr Nisa, R. Noriega‐Papaqui, R. Pelayo, J. Pretz, E. G. Pérez-Pérez, Z. Ren,Chang Dong Rho, C. Rivière, D. Rosa-González, M. Rosenberg, E. Ruiz-Velasco, H. Salazar,F. Salesa Greus,A. Sandoval, M. Schneider, Monica Seglar Arroyo, G. Sinnis,A. J. Smith, R. W. Springer, P. Surajbali, I. Taboada, O. Tibolla, K. Tollefson, I. Torres, T. N. Ukwatta, L. Villaseñor, T. Weisgarber, S. Westerhoff, I. G. Wisher, J. Wood, T. Yapici, G. Yodh, A. Zepeda, H. Zhou

The Astrophysical Journal（2018）

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摘要

The HAWC (High Altitude Water Cherenkov) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100~GeV) gamma-ray sources based on 507 days of observation. Among these, there are nineteen sources that are not associated with previously known TeV sources. We have studied fourteen of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1~TeV-30~TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. We did not find any counterpart for the selected fourteen new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected GeV gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region.

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2hwc catalog,<i>fermi</i>-lat,gamma-ray

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