Constraining the location of rapid gamma-ray flares in the FSRQ 3C 273
| dc.contributor.author | RANI, B. | |
| hal.structure.identifier | FERMI | |
| dc.contributor.author | LOTT, B. | |
| dc.contributor.author | P. KRICHBAUM, T. | |
| dc.contributor.author | FUHRMANN, L. | |
| dc.contributor.author | A. ZENSUS, J. | |
| dc.date.issued | 2013 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | We present a \gamma-ray photon flux and spectral variability study of the flat-spectrum radio quasar 3C 273 over a rapid flaring activity period between September 2009 to April 2010. Five major flares are observed in the source during this period. The most rapid flare observed in the source has a flux doubling time of 1.1 hr. The rapid \gamma-ray flares allow us to constrain the location and size of the \gamma-ray emission region in the source. The \gamma \gamma-opacity constrains the Doppler factor, δγ≥ 10 for the highest energy (15 GeV) photon observed by the {\it Fermi}-Large Area Telescope (LAT). Causality arguments constrain the size of the emission region to 1.6×1015 cm. The \gamma-ray spectra measured over this period show clear deviations from a simple power law with a break in 1-2 GeV energy range. We discuss possible explanations for the origin of the \gamma-ray spectral breaks. Our study suggests that the \gamma-ray emission region in 3C 273 is located within the broad line region (<1.6 pc). The spectral behavior and temporal characteristics of the individual flares indicate the presence of multiple shock scenarios at the base of the jet. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject | gamma rays: galaxies | |
| dc.subject | galaxies: active | |
| dc.subject | quasars: individual: 3C 273 | |
| dc.title.en | Constraining the location of rapid gamma-ray flares in the FSRQ 3C 273 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201321440 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
| dc.identifier.arxiv | 1307.0854 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A71 | |
| bordeaux.volume | 557 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | in2p3-00915615 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00915615v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2013&rft.volume=557&rft.spage=A71&rft.epage=A71&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=RANI,%20B.&LOTT,%20B.&P.%20KRICHBAUM,%20T.&FUHRMANN,%20L.&A.%20ZENSUS,%20J.&rft.genre=article |
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