Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24846
Campo DC | Valore | Lingua |
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dc.contributor.author | Ackermann, M. | en_US |
dc.contributor.author | Anantua, R. | en_US |
dc.contributor.author | Asano, K. | en_US |
dc.contributor.author | Baldini, L. | en_US |
dc.contributor.author | Barbiellini, G. | en_US |
dc.contributor.author | Bastieri, D. | en_US |
dc.contributor.author | Becerra Gonzalez, J. | en_US |
dc.contributor.author | Bellazzini, R. | en_US |
dc.contributor.author | Bissaldi, E. | en_US |
dc.contributor.author | Blandford, R. D. | en_US |
dc.contributor.author | Bloom, E. D. | en_US |
dc.contributor.author | Orlando, E. | en_US |
dc.contributor.author | Paneque, D. | en_US |
dc.contributor.author | Perkins, J. S. | en_US |
dc.contributor.author | Pesce-Rollins, M. | en_US |
dc.contributor.author | Piron, F. | en_US |
dc.contributor.author | Pivato, G. | en_US |
dc.contributor.author | Porter, T. A. | en_US |
dc.contributor.author | Principe, G. | en_US |
dc.contributor.author | Rando, R. | en_US |
dc.contributor.author | Razzano, M. | en_US |
dc.contributor.author | Razzaque, S. | en_US |
dc.contributor.author | Reimer, A. | en_US |
dc.contributor.author | Scargle, J. D. | en_US |
dc.contributor.author | Sgrò, C. | en_US |
dc.contributor.author | Sikora, M. | en_US |
dc.contributor.author | Simone, D. | en_US |
dc.contributor.author | Siskind, E. J. | en_US |
dc.contributor.author | Spada, F. | en_US |
dc.contributor.author | Spinelli, P. | en_US |
dc.contributor.author | Stawarz, L. | en_US |
dc.contributor.author | Thayer, J. B. | en_US |
dc.contributor.author | Thompson, D. J. | en_US |
dc.contributor.author | Torres, D. F. | en_US |
dc.contributor.author | Troja, E. | en_US |
dc.contributor.author | Uchiyama, Y. | en_US |
dc.contributor.author | Yuan, Y. | en_US |
dc.contributor.author | Zimmer, S. | en_US |
dc.contributor.author | Bonino, R. | en_US |
dc.contributor.author | Bottacini, E. | en_US |
dc.contributor.author | Bruel, P. | en_US |
dc.contributor.author | Buehler, R. | en_US |
dc.contributor.author | Caliandro, G. A. | en_US |
dc.contributor.author | Cameron, R. A. | en_US |
dc.contributor.author | Caragiulo, M. | en_US |
dc.contributor.author | CARAVEO, PATRIZIA | en_US |
dc.contributor.author | Cavazzuti, E. | en_US |
dc.contributor.author | Cecchi, C. | en_US |
dc.contributor.author | Cheung, C. C. | en_US |
dc.contributor.author | Chiang, J. | en_US |
dc.contributor.author | Chiaro, G. | en_US |
dc.contributor.author | Ciprini, S. | en_US |
dc.contributor.author | Cohen-Tanugi, J. | en_US |
dc.contributor.author | Costanza, F. | en_US |
dc.contributor.author | Cutini, S. | en_US |
dc.contributor.author | D'AMMANDO, FILIPPO | en_US |
dc.contributor.author | de Palma, F. | en_US |
dc.contributor.author | Desiante, R. | en_US |
dc.contributor.author | Digel, S. W. | en_US |
dc.contributor.author | Di Lalla, N. | en_US |
dc.contributor.author | Di Mauro, M. | en_US |
dc.contributor.author | Di Venere, L. | en_US |
dc.contributor.author | Drell, P. S. | en_US |
dc.contributor.author | Favuzzi, C. | en_US |
dc.contributor.author | Fegan, S. J. | en_US |
dc.contributor.author | Ferrara, E. C. | en_US |
dc.contributor.author | Fukazawa, Y. | en_US |
dc.contributor.author | Funk, S. | en_US |
dc.contributor.author | Fusco, P. | en_US |
dc.contributor.author | Gargano, F. | en_US |
dc.contributor.author | Gasparrini, D. | en_US |
dc.contributor.author | Giglietto, N. | en_US |
dc.contributor.author | Giordano, F. | en_US |
dc.contributor.author | GIROLETTI, MARCELLO | en_US |
dc.contributor.author | Grenier, I. A. | en_US |
dc.contributor.author | Guillemot, L. | en_US |
dc.contributor.author | Guiriec, S. | en_US |
dc.contributor.author | Hayashida, M. | en_US |
dc.contributor.author | Hays, E. | en_US |
dc.contributor.author | Horan, D. | en_US |
dc.contributor.author | Jóhannesson, G. | en_US |
dc.contributor.author | Kensei, S. | en_US |
dc.contributor.author | Kocevski, D. | en_US |
dc.contributor.author | Kuss, M. | en_US |
dc.contributor.author | La Mura, G. | en_US |
dc.contributor.author | Larsson, S. | en_US |
dc.contributor.author | Latronico, L. | en_US |
dc.contributor.author | Li, J. | en_US |
dc.contributor.author | Longo, F. | en_US |
dc.contributor.author | Loparco, F. | en_US |
dc.contributor.author | Lott, B. | en_US |
dc.contributor.author | Lovellette, M. N. | en_US |
dc.contributor.author | Lubrano, P. | en_US |
dc.contributor.author | Madejski, G. M. | en_US |
dc.contributor.author | Magill, J. D. | en_US |
dc.contributor.author | Maldera, S. | en_US |
dc.contributor.author | Manfreda, A. | en_US |
dc.contributor.author | Mayer, M. | en_US |
dc.contributor.author | Mazziotta, M. N. | en_US |
dc.contributor.author | Michelson, P. F. | en_US |
dc.contributor.author | Mirabal, N. | en_US |
dc.contributor.author | Mizuno, T. | en_US |
dc.contributor.author | Monzani, M. E. | en_US |
dc.contributor.author | Morselli, A. | en_US |
dc.contributor.author | Moskalenko, I. V. | en_US |
dc.contributor.author | Nalewajko, K. | en_US |
dc.contributor.author | Negro, M. | en_US |
dc.contributor.author | Nuss, E. | en_US |
dc.contributor.author | Ohsugi, T. | en_US |
dc.date.accessioned | 2020-05-14T16:55:23Z | - |
dc.date.available | 2020-05-14T16:55:23Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24846 | - |
dc.description.abstract | On 2015 June 16, Fermi-LAT observed a giant outburst from the flat spectrum radio quasar 3C 279 with a peak >100 MeV flux of ∼3.6 × 10<SUP>-5</SUP> photons cm<SUP>-2</SUP> s<SUP>-1</SUP>, averaged over orbital period intervals. It is historically the highest γ-ray flux observed from the source, including past EGRET observations, with the γ-ray isotropic luminosity reaching ∼10<SUP>49</SUP> erg s<SUP>-1</SUP>. During the outburst, the Fermi spacecraft, which has an orbital period of 95.4 minutes, was operated in a special pointing mode to optimize the exposure for 3C 279. For the first time, significant flux variability at sub-orbital timescales was found in blazar observations by Fermi-LAT. The source flux variability was resolved down to 2-minute binned timescales, with flux doubling times of less than 5 minutes. The observed minute-scale variability suggests a very compact emission region at hundreds of Schwarzschild radii from the central engine in conical jet models. A minimum bulk jet Lorentz factor (Γ) of 35 is necessary to avoid both internal γ-ray absorption and super-Eddington jet power. In the standard external radiation Comptonization scenario, Γ should be at least 50 to avoid overproducing the synchrotron self-Compton component. However, this predicts extremely low magnetization (∼5 × 10<SUP>-4</SUP>). Equipartition requires Γ as high as 120, unless the emitting region is a small fraction of the dissipation region. Alternatively, we consider γ rays originating as synchrotron radiation of γ <SUB>e</SUB> ∼ 1.6 × 10<SUP>6</SUP> electrons, in a magnetic field B ∼ 1.3 kG, accelerated by strong electric fields E ∼ B in the process of magnetoluminescence. At such short distance scales, one cannot immediately exclude the production of γ-rays in hadronic processes. | en_US |
dc.language.iso | eng | en_US |
dc.title | Minute-timescale >100 MeV γ-Ray Variability during the Giant Outburst of Quasar 3C 279 Observed by Fermi-LAT in 2015 June | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/2041-8205/824/2/L20 | en_US |
dc.identifier.scopus | 2-s2.0-84976367258 | en_US |
dc.identifier.isi | 000378168200004 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/2041-8205/824/2/L20 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 824 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | L20 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...824L..20A | en_US |
dc.relation.ercsector | Scienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0003-2478-8018 | - |
crisitem.author.orcid | 0000-0001-7618-7527 | - |
crisitem.author.orcid | 0000-0002-8657-8852 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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Ackermann_2016_ApJL_824_L20.pdf | PDF editoriale | 677.54 kB | Adobe PDF | Visualizza/apri |
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