MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21

Very High Energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z=0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high energy MeV/GeV gamma-ray activ...

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Detalles Bibliográficos
Autores: Paredes i Poy, Josep Maria, Moldón Vara, Francisco Javier, Ribó Gomis, Marc, Zabalza de Torres, Víctor, Cañellas, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/122837
Acceso en línea:https://hdl.handle.net/2445/122837
Access Level:acceso abierto
Palabra clave:Raigs còsmics
Galàxies actives
Quàsars
Cosmic rays
Active galaxies
Quasars
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spelling MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21Paredes i Poy, Josep MariaMoldón Vara, Francisco JavierRibó Gomis, MarcZabalza de Torres, VíctorCañellas, A.Raigs còsmicsGalàxies activesQuàsarsCosmic raysActive galaxiesQuasarsVery High Energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z=0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high energy MeV/GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70 GeV up to at least 400 GeV and can be well described by a power law dN/dE \propto E^-Gamma with a photon index Gamma= 3.75+/-0.27stat +/-0.2syst. The averaged integral flux above 100 GeV is (4.56+/-0.46)x10^(-10) cm^-2 s^-1 (~1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 min exposure implying a flux doubling time of about 10 min. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72+/-0.34 between 3 GeV and 400 GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the gamma-ray emission region outside the Broad Line Region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQ. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the Extragalactic Background Light in the UV-optical to near-infrared range that are compatible with recent models.Institute of Physics (IOP)2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/122837Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1088/2041-8205/730/1/L8Astrophysical Journal Letters, 2011, vol. 730, num. L8https://doi.org/10.1088/2041-8205/730/1/L8(c) American Astronomical Society, 2011info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1228372026-05-27T06:46:51Z
dc.title.none.fl_str_mv MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
spellingShingle MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
Paredes i Poy, Josep Maria
Raigs còsmics
Galàxies actives
Quàsars
Cosmic rays
Active galaxies
Quasars
title_short MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_full MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_fullStr MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_full_unstemmed MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_sort MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
dc.creator.none.fl_str_mv Paredes i Poy, Josep Maria
Moldón Vara, Francisco Javier
Ribó Gomis, Marc
Zabalza de Torres, Víctor
Cañellas, A.
author Paredes i Poy, Josep Maria
author_facet Paredes i Poy, Josep Maria
Moldón Vara, Francisco Javier
Ribó Gomis, Marc
Zabalza de Torres, Víctor
Cañellas, A.
author_role author
author2 Moldón Vara, Francisco Javier
Ribó Gomis, Marc
Zabalza de Torres, Víctor
Cañellas, A.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Raigs còsmics
Galàxies actives
Quàsars
Cosmic rays
Active galaxies
Quasars
topic Raigs còsmics
Galàxies actives
Quàsars
Cosmic rays
Active galaxies
Quasars
description Very High Energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z=0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high energy MeV/GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70 GeV up to at least 400 GeV and can be well described by a power law dN/dE \propto E^-Gamma with a photon index Gamma= 3.75+/-0.27stat +/-0.2syst. The averaged integral flux above 100 GeV is (4.56+/-0.46)x10^(-10) cm^-2 s^-1 (~1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 min exposure implying a flux doubling time of about 10 min. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72+/-0.34 between 3 GeV and 400 GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the gamma-ray emission region outside the Broad Line Region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQ. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the Extragalactic Background Light in the UV-optical to near-infrared range that are compatible with recent models.
publishDate 2011
dc.date.none.fl_str_mv 2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/122837
url https://hdl.handle.net/2445/122837
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1088/2041-8205/730/1/L8
Astrophysical Journal Letters, 2011, vol. 730, num. L8
https://doi.org/10.1088/2041-8205/730/1/L8
dc.rights.none.fl_str_mv (c) American Astronomical Society, 2011
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Astronomical Society, 2011
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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