Fermi-LAT Observations of the 2014 May–July outburst from 3C 454.3
| dc.contributor.author | BRITTO, Richard J. | |
| dc.contributor.author | BUSON, Sara | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | LOTT, Benoît | |
| dc.contributor.author | RAZZAQUE, Soebur | |
| dc.contributor.author | BOTTACINI, Eugenio | |
| dc.date.issued | 2016 | |
| dc.description.abstractEn | A prominent outburst of the flat spectrum radio quasar 3C 454.3 was observed in 2014 June with the Fermi Large Area Telescope. This outburst was characterized by a three-stage light-curve pattern—plateau, flare, and post-flare—that occurred from 2014 May to July, in a similar pattern as observed during the exceptional outburst in 2010 November. The highest flux of the outburst reported in this paper occurred during 2014 June 7–29, showing a multiple-peak structure in the light-curves. The average flux in these 22 days was found to be $F[E\gt 100\,\mathrm{MeV}]=(7.2\pm 0.2)\times {10}^{-6}$ ph cm(−)(2) s(−)(1), with a spectral index, for a simple power law, of ${\rm{\Gamma }}=2.04\pm 0.01$. That made this outburst the first γ-ray high state of 3C 454.3 ever to be detected by Fermi with such a hard spectrum over several days. The highest flux was recorded on 2014 June 15, in a 3 hr bin, at MJD 56823.5625, at a level of $F[E\gt 100\,\mathrm{MeV}]=(17.6\pm 1.9)\times {10}^{-6}$ ph cm(−)(2) s(−)(1). The rise time of one of the short subflares was found to be ${T}_{r}=1200\pm 700$ s at MJD = 56827, when the flux increased from 4 to 12 × 10(−)(6) ph cm(−)(2) s(−)(1). Several photons above 20 GeV were collected during this outburst, including one at 45 GeV on MJD 56827, constraining the γ-ray emission region to be located close to the outer boundary of the broad-line region, leading to fast flux variability. | |
| dc.language.iso | en | |
| dc.subject.en | galaxies: active | |
| dc.subject.en | gamma rays: galaxies | |
| dc.subject.en | quasars: individual | |
| dc.title.en | Fermi-LAT Observations of the 2014 May–July outburst from 3C 454.3 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.3847/0004-637X/830/2/162 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1511.02280 | |
| bordeaux.journal | Astrophys.J. | |
| bordeaux.page | 162 | |
| bordeaux.volume | 830 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03626539 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03626539v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophys.J.&rft.date=2016&rft.volume=830&rft.issue=2&rft.spage=162&rft.epage=162&rft.au=BRITTO,%20Richard%20J.&BUSON,%20Sara&LOTT,%20Beno%C3%AEt&RAZZAQUE,%20Soebur&BOTTACINI,%20Eugenio&rft.genre=article |
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