Fermi-LAT Detection of Gravitational Lens Delayed Gamma-ray Flares from Blazar B0218+357
| dc.contributor.author | C. CHEUNG, C. | |
| dc.contributor.author | D. SCARGLE, J. | |
| dc.contributor.author | D. BLANDFORD, R. | |
| dc.contributor.author | BULMASH, D. | |
| dc.contributor.author | CIPRINI, S. | |
| dc.contributor.author | H. D. CORBET, R. | |
| dc.contributor.author | E. FALCO, E. | |
| dc.contributor.author | J. MARSHALL, P. | |
| dc.contributor.author | AJELLO, Marco | |
| dc.contributor.author | BASTIERI, D. | |
| dc.contributor.author | CHEKHTMAN, A. | |
| dc.contributor.author | D'AMMANDO, F. | |
| dc.contributor.author | GIROLETTI, M. | |
| dc.contributor.author | E. GROVE, J. | |
| hal.structure.identifier | FERMI | |
| dc.contributor.author | LOTT, B. | |
| dc.contributor.author | ORIENTI, M. | |
| dc.contributor.author | S. PERKINS, J. | |
| dc.contributor.author | RAZZANO, M. | |
| dc.contributor.author | J. THOMPSON, D. | |
| dc.contributor.author | S. WOOD, K. | |
| dc.date.issued | 2014 | |
| dc.identifier.issn | 2041-8205 | |
| dc.description.abstractEn | Using data from the Fermi Large Area Telescope (LAT), we report the first clear gamma-ray measurement of a delay between flares from the gravitationally lensed images of a blazar. The delay was detected in B0218+357, a known double-image lensed system, during a period of enhanced gamma-ray activity with peak fluxes consistently observed to reach >20-50 times its previous average flux. An auto-correlation function analysis identified a delay in the gamma-ray data of 11.46 +/- 0.16 days (1 sigma) that is ~1 day greater than previous radio measurements. Considering that it is beyond the capabilities of the LAT to spatially resolve the two images, we nevertheless decomposed individual sequences of superposing gamma-ray flares/delayed emissions. In three such ~8-10 day-long sequences within a ~4-month span, considering confusion due to overlapping flaring emission and flux measurement uncertainties, we found flux ratios consistent with ~1, thus systematically smaller than those from radio observations. During the first, best-defined flare, the delayed emission was detailed with a Fermi pointing, and we observed flux doubling timescales of ~3-6 hrs implying as well extremely compact gamma-ray emitting regions. | |
| dc.language.iso | en | |
| dc.publisher | Bristol : IOP Publishing | |
| dc.subject.en | galaxies: active | |
| dc.subject.en | gamma rays: galaxies | |
| dc.subject.en | gravitational lensing: strong | |
| dc.subject.en | quasars: individual (B0218+357) | |
| dc.title.en | Fermi-LAT Detection of Gravitational Lens Delayed Gamma-ray Flares from Blazar B0218+357 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1088/2041-8205/782/2/L14 | |
| 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 | 1401.0548 | |
| bordeaux.journal | The Astrophysical journal letters | |
| bordeaux.page | L14 | |
| bordeaux.volume | 782 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | in2p3-00977378 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00977378v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20journal%20letters&rft.date=2014&rft.volume=782&rft.spage=L14&rft.epage=L14&rft.eissn=2041-8205&rft.issn=2041-8205&rft.au=C.%20CHEUNG,%20C.&D.%20SCARGLE,%20J.&D.%20BLANDFORD,%20R.&BULMASH,%20D.&CIPRINI,%20S.&rft.genre=article |
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