A survey of active galaxies at TeV photon energies with the HAWC gamma-ray observatory
Creators: name: Albert, A.
name: Alvarez, C.
name: Camacho, J. R. Angeles
name: Arteaga-Velázquez, J. C.
name: Arunbabu, K. P.
name: Rojas, D. Avila
name: Solares, H. A. Ayala
name: Baghmanyan, V.
name: Belmont-Moreno, E.
name: BenZvi, S. Y.
name: Brisbois, C.
name: Caballero-Mora, K. S.
name: Capistrán, T.
name: Carramiñana, A.
name: Casanova, S.
name: Cotti, U.
name: Cotzomi, J.
name: de León, S. Coutiño
name: De la Fuente, E.
name: Dingus, B. L.
name: DuVernois, M. A.
name: Durocher, M.
name: Díaz-Vélez, J. C.
name: Engel, K.
name: Espinoza, C.
name: Fan, K. L.
name: Alonso, M. Fernández
name: Fleischhack, H.
name: Fraija, N.
name: Galván-Gámez, A.
name: García, D.
name: García-González, J. A.
name: Garfias, F.
name: González, M. M.
name: Goodman, J. A.
name: Harding, J. P.
name: Hernández, S.
name: Hona, B.
name: Huang, D.
name: Hueyotl-Zahuantitla, F.
name: Hüntemeyer, P.
name: Iriarte, A.
name: Jardin-Blicq, A.
name: Joshi, V.
name: Kieda, D.
name: Lara, A.
name: Lee, W. H.
name: Vargas, H. León
name: Linnemann, J. T.
name: Longinotti, A. L.
name: Luis-Raya, G.
name: Lundeen, J.
name: Malone, K.
name: Martínez, O.
name: Martinez-Castellanos, I.
name: Martínez-Castro, J.
name: Matthews, J. A.
name: Miranda-Romagnoli, P.
name: Morales-Soto, J. A.
name: Moreno, E.
name: Mostafá, M.
name: Nayerhoda, A.
name: Nellen, L.
name: Newbold, M.
name: Nisa, M. U.
name: Noriega-Papaqui, R.
name: Olivera-Nieto, L.
name: Peisker, A.
name: Pérez-Pérez, E. G.
name: Rho, C. D.
name: Rosa-González, D.
name: Ruiz-Velasco, E.
name: Salazar, H.
name: Greus, F. Salesa
name: Sandoval, A.
name: Schneider, M.
name: Schoorlemmer, H.
name: Smith, A. J.
name: Springer, R. W.
name: Tollefson, K.
name: Torres, I.
name: Torres-Escobedo, R.
name: Ureña-Mena, F.
name: Villaseñor, L.
name: Weisgarber, T.
name: Willox, E.
name: Zepeda, A.
name: Zhou, H.
name: de León, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The High Altitude Water Cherenkov Gamma-Ray Observatory (HAWC) continuously detects TeV photons and particles within its large field-of-view, accumulating every day a deeper exposure of two thirds of the sky. We analyzed 1523~days of HAWC live data acquired over four and a half years, in a follow-up analysis of {138} nearby ($z&lt;0.3$) active galactic nuclei from the {\em Fermi} 3FHL catalog culminating within $40^\circ$ of the zenith at Sierra Negra, the HAWC site. This search for persistent TeV emission used a maximum-likelihood analysis assuming intrinsic power-law spectra attenuated by pair production of gamma-ray photons with the extragalactic background light. HAWC clearly detects persistent emission from Mkn~421 and Mkn~501, the two brightest blazars in the TeV sky, at 65$σ$ and 17$σ$ level, respectively. {Weaker evidence for long-term emission is found for three other known very-high energy emitters:} the radiogalaxy M87 and the BL Lac objects VER~J0521+211 and 1ES~1215+303, the later two at $z\sim 0.1$. We find evidence for collective emission from the set of 30 previously reported very high-energy sources that excludes Mkn~421 and Mkn~501 with a random probability $\sim 10^{-5}$. Upper limits are presented for the sample under the power-law assumption and in the predefined (0.5-2.0), (2.0-8.0) and (8.0-32.0) TeV energy intervals.
description: The HAWC survey of Fermi 3FHL AGNs: 30 pages, 13 figures. Submitted to the Astrophysical Journal