J/ApJ/907/67 HAWC Gamma-Ray survey, AGNs at TeV photon energies (Albert+, 2021)
A Survey of Active Galaxies at TeV Photon Energies with the HAWC Gamma-Ray
Observatory.
Albert A., Alvarez C., Camacho J.R.A., Arteaga-Velazquez J.C.,
Arunbabu K.P., Rojas D.A., Solares H.A.A., Baghmanyan V., Belmont-Moreno E.,
BenZvi S.Y., Brisbois C., Caballero-Mora K.S., Capistran T., Carraminana A.,
Casanova S., Cotti U., Cotzomi J., de Leon S.C., De la Fuente E.,
Dingus B.L., DuVernois M.A., Durocher M., Diaz-Velez J.C., Engel K.,
Espinoza C., Fan K.L., Alonso M.F., Fleischhack H., Fraija N.,
Galvan-Gamez A., Garcia D., Garcia-Gonzalez J.A., Garfias F., Gonzalez M.M.,
Goodman J.A., Harding J.P., Hernandez S., Hona B., Huang D.,
Hueyotl-Zahuantitla F., Huntemeyer P., Iriarte A., Jardin-Blicq A.,
Joshi V., Kieda D., Kunde G.J., Lara A., Lee W.H., Vargas H.L.,
Linnemann J.T., Longinotti A.L., Luis-Raya G., Lundeen J., Malone K.,
Martinez O., Martinez-Castellanos I., Martinez-Castro J., Matthews J.A.,
Miranda-Romagnoli P., Morales-Soto J.A., Moreno E., Mostafa M.,
Nayerhoda A., Nellen L., Newbold M., Nisa M.U., Noriega-Papaqui R.,
Olivera-Nieto L., Peisker A., Perez-Perez E.G., Rho C.D., Rosa-Gonzalez D.,
Ruiz-Velasco E., Salazar H., Greus F.S., Sandoval A., Schneider M.,
Schoorlemmer H., Smith A.J., Springer R.W., Tollefson K., Torres I.,
Torres-Escobedo R., Urena-Mena F., Villasenor L., Weisgarber T., Willox E.,
Zepeda A., Zhou H., de Leon C., The HAWC collaboration
<Astrophys. J., 907, 67 (2021)>
=2021ApJ...907...67A 2021ApJ...907...67A
ADC_Keywords: Active gal. nuclei; Gamma rays; Surveys
Keywords: Active galactic nuclei ; Blazars ; Gamma rays ; Gamma-ray
sources ; Sky surveys ; Radio galaxies
Abstract:
The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory
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 1523days of HAWC live data acquired over four and a
half years, in a follow-up analysis of 138 nearby (z<0.3) active
galactic nuclei from the Third Catalog of Hard Fermi-LAT sources
culminating within 40° 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 Mkn421 and
Mkn501, the two brightest blazars in the TeV sky, at 65σ and
17σ level, respectively. Marginal evidence, just above the
3σ level, was found for three other known very high-energy
emitters: the radio galaxy M87 and the BL Lac objects VERJ0521+211 and
1ES1215+303, the latter two at z∼0.1. We find a 4.2σ evidence
for collective emission from the set of 30 previously reported very
high-energy sources, with Mkn421 and Mkn501 excluded. 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:
High Altitude Water Cherenkov (HAWC) is a wide field-of-view TeV
γ-ray observatory optimized for surveying cosmic high-energy
sources. It is located inside the Parque Nacional Pico de Orizaba, in
the Mexican state of Puebla. The HAWC array occupies a relatively flat
area of the Volcan Sierra Negra mountain, at an altitude of 4100m,
centered at geographical latitude 18.995N and longitude 97.308W. The
observatory consists of a dense array of 300 large water Cherenkov
detectors (WCDs) covering collectively a physical area larger than
22000m2. Each WCD is a cylindrical tank of 7.3m diameter and 5m
height, filled with 180m3 of water and instrumented with four
upward-facing photomultiplier tubes (PMTs) at its base.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 85 136 HAWC power-law fits and significances for the
revised sample of 136 AGNs from the 3FHL catalog
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See also:
J/ApJS/175/97 : CGRaBS survey of γ-ray blazar candidates (Healey+, 2008)
J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)
J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)
J/A+A/593/A91 : Mrk 421 multi-wavelength variability, 2007-2009 (Ahnen+, 2016)
J/ApJS/232/18 : The third Fermi-LAT >10GeV catalog (3FHL) (Ajello+, 2017)
J/A+A/612/A1 : H.E.S.S. Galactic Plane Survey (HESS+, 2018)
J/ApJS/247/16 : Extreme high-frequency-peaked BL Lac objects (Acciari+, 2020)
J/ApJ/891/170 : 10yr radio-to-gamma-ray obs. of 1ES 1215+30.3 (Valverde+, 2020)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- 3FHL Source name from 3FHL catalog
14- 37 A24 --- Name Other identifier
39- 42 A4 --- Class Identification or association class given in 3FHL (1)
44- 49 F6.4 --- z [0.003/0.3] 3FHL redshift
51- 58 F8.2 --- TS [-5.82/4167] Test statistics and significances
estimated
60- 65 F6.2 --- e_TS [-3/65] Error on TS
67- 72 F6.2 --- K [-99/29.5] Power-law normalization at 1 TeV
(10-12/TeV/cm2/s)
74- 78 F5.2 --- e_K [0.16/71] Error on K
80- 85 F6.2 --- l_K [0.24/107] 2sigma upper limit (in same unit) on K (2)
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Note (1): Class as follows:
BLL = BL Lacertae objects (identification; 6 occurrences)
bll = BL Lacertae objects (association; 109 occurrences)
FSRQ = Flat-spectrum radio quasars (identification; 1 occurrence)
fsrq = Flat-spectrum radio quasars (association; 5 occurrences)
RDG = Radio galaxies (identification; 2 occurrences)
rdg = Radio galaxies (association; 4 occurrences)
bcu = Blazars candidates of uncertain type (association; 8 occurrences)
sbg = Starburst galaxies (association; 1 occurrence)
Note (2): Computed following Feldman & Cousins, 1998PhRvD..57.3873F 1998PhRvD..57.3873F.
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 10-Jun-2022