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The most powerful flaring activity from the NLSyl PMN J0948+0022

  • We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma-rays, PMN J0948+0022 (z = 0.5846). A y -ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 31) x 10 8 ph cm(-2) S-1 on 2013 January 1, corresponding to an apparent isotropic luminosity of similar to 1.5 x 1048 erg s(-1). The y -ray flaring period triggered Swift and Very Energetic Radiation Imaging Telescope Array System (VERITAS) observations in addition to radio and optical monitoring by Owens Valley Radio Observatory, Monitoring Of Jets in Active galactic nuclei with VLBA Experiments, and Catalina Real-time Transient Survey. A strong flare was observed in optical, UV, and X-rays on 2012 December 30, quasi-simultaneously to the y -ray flare, reaching a record flux for this source from optical to y gamma-rays. VERITAS observations at very high energy (E > 100 GeV) during 2013We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma-rays, PMN J0948+0022 (z = 0.5846). A y -ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 31) x 10 8 ph cm(-2) S-1 on 2013 January 1, corresponding to an apparent isotropic luminosity of similar to 1.5 x 1048 erg s(-1). The y -ray flaring period triggered Swift and Very Energetic Radiation Imaging Telescope Array System (VERITAS) observations in addition to radio and optical monitoring by Owens Valley Radio Observatory, Monitoring Of Jets in Active galactic nuclei with VLBA Experiments, and Catalina Real-time Transient Survey. A strong flare was observed in optical, UV, and X-rays on 2012 December 30, quasi-simultaneously to the y -ray flare, reaching a record flux for this source from optical to y gamma-rays. VERITAS observations at very high energy (E > 100 GeV) during 2013 January 6-17 resulted in an upper limit of F>0.2 Trev < 4.0 x 10(-12) ph cm(-2) s(-1). We compared the spectral energy distribution (SED) of the flaring state in 2013 January with that of an intermediate state observed in 2011. The two SEDs, modelled as synchrotron emission and an external Compton scattering of seed photons from a dust torus, can be modelled by changing both the electron distribution parameters and the magnetic field.show moreshow less

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Author:M. Orienti, J. Finke, C. M. Raiteri, T. Hovatta, J. Larsson, W. Max-Moerbeck, J. Perkins, A. C. S. Readhead, J. L. Richards, M. Beilicke, W. Benbow, K. Berger, R. Bird, V. Bugaev, J. V. Cardenzana, M. Cerruti, Xuhui Chen, L. Ciupik, H. J. Dickinson, J. D. Eisch, M. Errando, A. Falcone, J. P. Finley, H. Fleischhack, P. Fortin, L. Fortson, A. Furniss, L. Gerard, G. H. Gillanders, S. T. Griffiths, J. Grube, G. Gyuk, Nils Hakansson, J. Holder, T. B. Humensky, P. Kar, M. Kertzman, Y. Khassen, D. Kieda, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, D. Nieto, R. A. Ong, A. N. Otte, Manuela Pohl, A. Popkow, H. Prokoph, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, J. Rousselle, M. Santander, G. H. Sembroski, A. W. Smith, D. Staszak, Igor Telezhinsky, J. V. Tucci, J. Tyler, A. Varlotta, V. V. Vassiliev, S. P. Wakely, A. Weinstein, R. Welsing, D. A. Williams, B. Zitzer
DOI:https://doi.org/10.1093/mnras/stu2251
ISSN:0035-8711 (print)
ISSN:1365-2966 (online)
Parent Title (English):Monthly notices of the Royal Astronomical Society
Publisher:Oxford Univ. Press
Place of publication:Oxford
Document Type:Article
Language:English
Year of first Publication:2015
Year of Completion:2015
Creating Corporation:VERITAS Collaboration
Release Date:2017/03/27
Tag:galaxies: Seyfert; galaxies: active-galaxies: individual: PMN J0948+0022; galaxies: nuclei; gamma-rays: general
Volume:446
Issue:3
Pagenumber:12
First Page:2456
Last Page:2467
Funder:US Department of Energy Office of Science; Smithsonian Institution; NSERC in Canada; Science Foundation Ireland [SFI 10/RFP/AST2748]; Science and Technology Facilities Council in the UK; NASA [NNX08AW31G, NNX11A043G]; NSF [AST-0808050, AST-1109911]; US National Science Foundation [AST-0909182]; Fermi Guest Investigator grants [NNX08AW56G, NNX09AU10G, NNX12AO93G]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert