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, R. Brose, M. Buchovecky, J. H. Buckley, V. Bugaev, A. J. Chromey, M. P. Connolly, W. Cui, M. K. Daniel, A. Falcone, Q. Feng, J. P. Finley, L. Fortson, A. Furniss, M. Hütten, D. Hanna, O. HervetJ. Holder, G. Hughes, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, M. Kertzman, D. Kieda, M. 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. T. Richards, E. Roache, C. Rulten, I. Sadeh, M. Santander, G. H. Sembroski, K. Shahinyan, I. Sushch, J. Tyler, S. P. Wakely, A. Weinstein, R. M. Wells, P. Wilcox, A. Wilhelm, D. A. Williams, T. J. Williamson, B. Zitzer, S. Abdollahi, M. Ajello, L. Baldini, G. Barbiellini, D. Bastieri, R. Bellazzini, B. Berenji, E. Bissaldi, R. D. Blandford, R. Bonino, E. Bottacini, T. J. Brandt, P. Bruel, R. Buehler, R. A. Cameron, R. Caputo, P. A. Caraveo, D. 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, M. Di Mauro, L. Di Venere, A. Dominguez, C. Favuzzi, S. J. Fegan, A. Franckowiak, Y. 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, J. W. Hewitt, D. Horan, G. Jóhannesson, S. Kensei, M. Kuss, S. 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, M. Negro, E. Nuss, R. Ojha, N. Omodei, M. Orienti, E. Orlando, M. Palatiello, V. S. Paliya, D. Paneque, J. S. Perkins, M. Persic, M. Pesce-Rollins, V. Petrosian, F. Piron, T. A. Porter, G. Principe, S. Raino, R. Rando, B. Rani, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, C. Sgro, 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. Wood, M. Yassine, R. Alfaro, C. Alvarez, J. D. Alvarez, R. Arceo, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A.Ayala Solares, A. Becerril, E. Belmont-Moreno, S. Y. Benzvi, A. Bernal, J. Braun, C. Brisbois, K. S. Caballero-Mora, T. Capistrán, A. Carraminana, S. Casanova, M. Castillo, U. Cotti, J. Cotzomi, S. Coutino De León, C. De León, E. De La Fuente, S. Dichiara, B. L. Dingus, M. A. Duvernois, J. C. Diaz-Vélez, K. Engel, O. Enriquez-Rivera, D. W. Fiorino, H. Fleischhack, N. Fraija, J. A. Garcia-González, F. Garfias, A. González Munoz, M. M. González, J. A. Goodman, Z. Hampel-Arias, J. P. Harding, S. Hernandez, A. Hernandez-Almada, B. Hona, F. Hueyotl-Zahuantitla, C. M. Hui, P. Hüntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, S. Kaufmann, A. Lara, R. J. Lauer, W. H. Lee, D. Lennarz, H. León Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, R. Luna-Garcia, R. López-Coto, K. Malone, S. S. Marinelli, O. Martinez, I. Martinez-Castellanos, J. Martinez-Castro, H. Martinez-Huerta, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, R. Pelayo, J. Pretz, E. G. Pérez-Pérez, Z. Ren, C. D. Rho, C. Riviere, D. Rosa-González, M. Rosenberg, E. Ruiz-Velasco, H. Salazar, F. Salesa Greus, A. Sandoval, M. Schneider, M. Seglar Arroyo, G. Sinnis, A. J. Smith, R. W. Springer, P. Surajbali, I. Taboada, O. Tibolla, K. Tollefson, I. Torres, T. N. Ukwatta, L. Villasenor, T. Weisgarber, S. Westerhoff, I. G. Wisher, J. Wood, T. Yapici, G. Yodh, A. Zepeda, H. Zhou

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Abstract

The High Altitude Water Cherenkov (HAWC) 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, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. We have studied 14 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 14 new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected gigaelectronvolt (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.

Original languageEnglish (US)
Article number24
JournalAstrophysical Journal
Volume866
Issue number1
DOIs
StatePublished - Oct 10 2018

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Chromey, A. J., Connolly, M. P., Cui, W., Daniel, M. K., Falcone, A., Feng, Q., Finley, J. P., Fortson, L., Furniss, A., Hütten, M., Hanna, D., ... Zhou, H. (2018). VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog. Astrophysical Journal, 866(1), [24]. https://doi.org/10.3847/1538-4357/aade4e