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<ri:Resource created="2022-06-27T07:43:52Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>HAWC Gamma-Ray survey, AGNs at TeV photon energies</title><shortName>J/ApJ/907/67</shortName><identifier>ivo://CDS.VizieR/J/ApJ/907/67</identifier><altIdentifier>doi:10.26093/cds/vizier.19070067</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Albert A.</name></creator><creator><name>Alvarez C.</name></creator><creator><name>Camacho J.R.A.</name></creator><creator><name>Arteaga-Velazquez J.C.,Arunbabu K.P.</name></creator><creator><name>Rojas D.A.</name></creator><creator><name>Solares H.A.A.</name></creator><creator><name>Baghmanyan V.</name></creator><creator><name>Belmont-Moreno E.,BenZvi S.Y.</name></creator><creator><name>Brisbois C.</name></creator><creator><name>Caballero-Mora K.S.</name></creator><creator><name>Capistran T.</name></creator><creator><name>Carraminana A.,Casanova S.</name></creator><creator><name>Cotti U.</name></creator><creator><name>Cotzomi J.</name></creator><creator><name>de Leon S.C.</name></creator><creator><name>De la Fuente E.,Dingus B.L.</name></creator><creator><name>DuVernois M.A.</name></creator><creator><name>Durocher M.</name></creator><creator><name>Diaz-Velez J.C.</name></creator><creator><name>Engel K.,Espinoza C.</name></creator><creator><name>Fan K.L.</name></creator><creator><name>Alonso M.F.</name></creator><creator><name>Fleischhack H.</name></creator><creator><name>Fraija N.,Galvan-Gamez A.</name></creator><creator><name>Garcia D.</name></creator><creator><name>Garcia-Gonzalez J.A.</name></creator><creator><name>Garfias F.</name></creator><creator><name>Gonzalez M.M.,Goodman J.A.</name></creator><creator><name>Harding J.P.</name></creator><creator><name>Hernandez S.</name></creator><creator><name>Hona B.</name></creator><creator><name>Huang D.,Hueyotl-Zahuantitla F.</name></creator><creator><name>Huntemeyer P.</name></creator><creator><name>Iriarte A.</name></creator><creator><name>Jardin-Blicq A.,Joshi V.</name></creator><creator><name>Kieda D.</name></creator><creator><name>Kunde G.J.</name></creator><creator><name>Lara A.</name></creator><creator><name>Lee W.H.</name></creator><creator><name>Vargas H.L.,Linnemann J.T.</name></creator><creator><name>Longinotti A.L.</name></creator><creator><name>Luis-Raya G.</name></creator><creator><name>Lundeen J.</name></creator><creator><name>Malone K.,Martinez O.</name></creator><creator><name>Martinez-Castellanos I.</name></creator><creator><name>Martinez-Castro J.</name></creator><creator><name>Matthews J.A.,Miranda-Romagnoli P.</name></creator><creator><name>Morales-Soto J.A.</name></creator><creator><name>Moreno E.</name></creator><creator><name>Mostafa M.,Nayerhoda A.</name></creator><creator><name>Nellen L.</name></creator><creator><name>Newbold M.</name></creator><creator><name>Nisa M.U.</name></creator><creator><name>Noriega-Papaqui R.,Olivera-Nieto L.</name></creator><creator><name>Peisker A.</name></creator><creator><name>Perez-Perez E.G.</name></creator><creator><name>Rho C.D.</name></creator><creator><name>Rosa-Gonzalez D.,Ruiz-Velasco E.</name></creator><creator><name>Salazar H.</name></creator><creator><name>Greus F.S.</name></creator><creator><name>Sandoval A.</name></creator><creator><name>Schneider M.,Schoorlemmer H.</name></creator><creator><name>Smith A.J.</name></creator><creator><name>Springer R.W.</name></creator><creator><name>Tollefson K.</name></creator><creator><name>Torres I.,Torres-Escobedo R.</name></creator><creator><name>Urena-Mena F.</name></creator><creator><name>Villasenor L.</name></creator><creator><name>Weisgarber T.</name></creator><creator><name>Willox E.,Zepeda A.</name></creator><creator><name>Zhou H.</name></creator><creator><name>de Leon C.</name></creator><creator><name>The HAWC collaboration</name></creator><date role="Updated">2022-08-26T06:42:35Z</date><date role="Created">2022-06-27T07:43:52Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>active-galactic-nuclei</subject><subject>gamma-ray-astronomy</subject><subject>surveys</subject><description>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&lt;0.3) active galactic nuclei from the Third Catalog of Hard Fermi-LAT sources culminating within 40{deg} 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 65{sigma} and 17{sigma} level, respectively. Marginal evidence, just above the 3{sigma} 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 4.2{sigma} 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><source format="bibcode">2021ApJ...907...67A</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/907/67</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/175/97">J/ApJS/175/97 : CGRaBS survey of {gamma}-ray blazar candidates (Healey+, 2008)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/764/135">J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/218/23">J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/593/A91">J/A+A/593/A91 : Mrk 421 multi-wavelength variability, 2007-2009 (Ahnen+, 2016)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/232/18">J/ApJS/232/18 : The third Fermi-LAT &gt;10GeV catalog (3FHL) (Ajello+, 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/612/A1">J/A+A/612/A1 : H.E.S.S. 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