VERITAS and Fermi-LAT observations of new HAWC sources
Abstract
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.
Keywords
Cite
@article{arxiv.1808.10423,
title = {VERITAS and Fermi-LAT observations of new HAWC sources},
author = {VERITAS Collaboration and A. U. Abeysekara and A. Archer and W. Benbow and R. Bird and R. Brose and M. Buchovecky and J. H. Buckley and V. Bugaev and A. J. Chromey and M. P. Connolly and W. Cui and M. K. Daniel and A. Falcone and Q. Feng and J. P. Finley and L. Fortson and A. Furniss and M. Hutten and D. Hanna and O. Hervet and J. Holder and G. Hughes and T. B. Humensky and C. A. Johnson and P. Kaaret and P. Kar and M. Kertzman and D. Kieda and M. Krause and F. Krennrich and S. Kumar and M. J. Lang and T. T. Y. Lin and S. McArthur and P. Moriarty and R. Mukherjee and S. O'Brien and R. A. Ong and A. N. Otte and N. Park and A. Petrashyk and M. Pohl and E. Pueschel and J. Quinn and K. Ragan and P. T. Reynolds and G. T. Richards and E. Roache and C. Rulten and I. Sadeh and M. Santander and G. H. Sembroski and K. Shahinyan and I. Sushch and J. Tyler and S. P. Wakely and A. Weinstein and R. M. Wells and P. Wilcox and A. Wilhelm and D. A. Williams and T. J. Williamson and B. Zitzer and Fermi-LAT Collaboration and : and S. Abdollahi and M. Ajello and L. Baldini and G. Barbiellini and D. Bastieri and R. Bellazzini and B. Berenji and E. Bissaldi and R. D. Blandford and R. Bonino and E. Bottacini and T. J. Brandt and P. Bruel and R. Buehler and R. A. Cameron and R. Caputo and P. A. Caraveo and D. Castro and E. Cavazzuti and E. Charles and G. Chiaro and S. Ciprini and J. Cohen-Tanugi and D. Costantin and S. Cutini and F. D'Ammando and F. de Palma and N. Di Lalla and M. Di Mauro and L. Di Venere and A. Dominguez and C. Favuzzi and S. J. Fegan and A. Franckowiak and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and F. Giordano and M. Giroletti and D. Green and I. A. Grenier and L. Guillemot and S. Guiriec and E. Hays and J. W. Hewitt and D. Horan and G. Johannesson and S. Kensei and M. Kuss and S. Larsson and L. Latronico and M. Lemoine-Goumard and J. Li and F. Longo and F. Loparco and M. N. Lovellette and P. Lubrano and J. D. Magill and S. Maldera and M. N. Mazziotta and J. E. McEnery and P. F. Michelson and W. Mitthumsiri and T. Mizuno and M. E. Monzani and A. Morselli and I. V. Moskalenko and M. Negro and E. Nuss and R. Ojha and N. Omodei and M. Orienti and E. Orlando and M. Palatiello and V. S. Paliya and D. Paneque and J. S. Perkins and M. Persic and M. Pesce-Rollins and V. Petrosian and F. Piron and T. A. Porter and G. Principe and S. Raino and R. Rando and B. Rani and M. Razzano and S. Razzaque and A. Reimer and O. Reimer and T. Reposeur and C. Sgro and E. J. Siskind and G. Spandre and P. Spinelli and D. J. Suson and H. Tajima and J. B. Thayer and D. J. Thompson and D. F. Torres and G. Tosti and E. Troja and J. Valverde and G. Vianello and M. Vogel and K. Wood and M. Yassine and HAWC Collaboration and : and R. Alfaro and C. Alvarez and J. D. Alvarez and R. Arceo and J. C. Arteaga-Velazquez and D. Avila Rojas and H. A. Ayala Solares and A. Becerril and E. Belmont-Moreno and S. Y. BenZvi and A. Bernal and J. Braun and C. Brisbois and K. S. Caballero-Mora and T. Capistran and A. Carraminana and S. Casanova and M. Castillo and U. Cotti and J. Cotzomi and S. Coutino de Leon and C. De Leon and E. De la Fuente and S. Dichiara and B. L. Dingus and M. A. DuVernois and J. C. Diaz-Velez and K. Engel and O. Enriquez-Rivera and D. W. Fiorino and H. Fleischhack and N. Fraija and J. A. Garcia-Gonzalez and F. Garfias and A. Gonzalez Munoz and M. M. Gonzalez and J. A. Goodman and Z. Hampel-Arias and J. P. Harding and S. Hernandez and A. Hernandez-Almada and B. Hona and F. Hueyotl-Zahuantitla and C. M. Hui and P. Huntemeyer and A. Iriarte and A. Jardin-Blicq and V. Joshi and S. Kaufmann and A. Lara and R. J. Lauer and W. H. Lee and D. Lennarz and H. Leon Vargas and J. T. Linnemann and A. L. Longinotti and G. Luis-Raya and R. Luna-Garcia and R. Lopez-Coto and K. Malone and S. S. Marinelli and O. Martinez and I. Martinez-Castellanos and J. Martinez-Castro and H. Martinez-Huerta and J. A. Matthews and P. Miranda-Romagnoli and E. Moreno and M. Mostafa and A. Nayerhoda and L. Nellen and M. Newbold and M. U. Nisa and R. Noriega-Papaqui and R. Pelayo and J. Pretz and E. G. Perez-Perez and Z. Ren and C. D. Rho and C. Riviere and D. Rosa-Gonzalez and M. Rosenberg and E. Ruiz-Velasco and H. Salazar and F. Salesa Greus and A. Sandoval and M. Schneider and M. Seglar Arroyo and G. Sinnis and A. J. Smith and R. W. Springer and P. Surajbali and I. Taboada and O. Tibolla and K. Tollefson and I. Torres and T. N. Ukwatta and L. Villasenor and T. Weisgarber and S. Westerhoff and I. G. Wisher and J. Wood and T. Yapici and G. Yodh and A. Zepeda and H. Zhou},
journal= {arXiv preprint arXiv:1808.10423},
year = {2018}
}
Comments
Accepted for publication in the ApJ, Corresponding author: Nahee Park (VERITAS Collaboration), John W. Hewitt (Fermi-LAT Collaboration), Ignacio Taboada (HAWC Collaboration), 30 pages, 12 figures