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Discovery of very high energy gamma-rays from 1ES 1011+496 at z=0.212

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dc.contributor.authorAntoranz Canales, Pedro
dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorContreras González, José Luis
dc.contributor.authorFonseca González, María Victoria
dc.contributor.authorLópez Moya, Marcos
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorNieto Castaño, Daniel
dc.date.accessioned2023-06-20T10:39:10Z
dc.date.available2023-06-20T10:39:10Z
dc.date.issued2007-09-20
dc.description© The American Astronomical Society. We thank the IAC for the excellent working conditions at the ORM. The support of the German BMBF and MPG, the Italian INFN, the Spanish CICYT, the ETH Research Grant TH 34/04 3, and the Polish MNiI Grant 1P03D01028 is gratefully acknowledged. We thank A. Berdyugin for performing the optical observations and A. Lähteenmäki (Metsähovi) for the radio observations.
dc.description.abstractWe report on the discovery of very high energy (VHE) gamma-ray emission from the BL Lacertae object 1ES 1011+496. The observation was triggered by an optical outburst in 2007 March and the source was observed with the MAGIC telescope from 2007 March to May. Observing for 18.7 hr, we find an excess of 6.2 sigma with an integrated flux above 200 GeV of ( 1.58 +/- 0.32) x 10(-11) photons cm(-2) s(-1). The VHE gamma-ray flux is > 40% higher than in 2006 March-April ( reported elsewhere), indicating that the VHE emission state may be related to the optical emission state. We have also determined the redshift of 1ES 1011+496 based on an optical spectrum that reveals the absorption lines of the host galaxy. The redshift of z = 0.212 makes 1ES 1011+496 the most distant source observed to emit VHE gamma-rays to date.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipGerman MPG
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipSpanish CICYT
dc.description.sponsorshipETH
dc.description.sponsorshipPolish MNiI
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/23769
dc.identifier.doi10.1086/521982
dc.identifier.issn0004-637X
dc.identifier.officialurlhttp://dx.doi.org/10.1086/521982
dc.identifier.relatedurlhttp://iopscience.iop.org
dc.identifier.relatedurlhttp://arxiv.org/abs/0706.4435
dc.identifier.urihttps://hdl.handle.net/20.500.14352/50903
dc.issue.number1 (Par
dc.journal.titleAstrophysical journal
dc.language.isoeng
dc.page.finalL24
dc.page.initialL21
dc.publisherIOP Publishing
dc.relation.projectIDTH 34/04
dc.relation.projectID1P03D0102
dc.rights.accessRightsopen access
dc.subject.cdu537
dc.subject.cdu539.1
dc.subject.keywordExtragalactic Background Light
dc.subject.keywordBL-Lacertae Objects
dc.subject.keywordTEV Blazars
dc.subject.keywordLAC Objects
dc.subject.keywordEmission
dc.subject.keywordPG-1553+113
dc.subject.keywordAbsorption
dc.subject.keywordTelescope
dc.subject.keywordEvolution
dc.subject.keywordRadiation.
dc.subject.ucmElectrónica (Física)
dc.subject.ucmElectricidad
dc.subject.ucmFísica nuclear
dc.subject.unesco2202.03 Electricidad
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titleDiscovery of very high energy gamma-rays from 1ES 1011+496 at z=0.212
dc.typejournal article
dc.volume.number667
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