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dc.contributor.authorMoriarty, P.
dc.contributor.authorGillanders, Gary
dc.contributor.authorLang, Mark
dc.identifier.citationD'Ammando, F,Orienti, M,Finke, J,Raiteri, CM,Hovatta, T,Larsson, J,Max-Moerbeck, W,Perkins, J,Readhead, ACS,Richards, JL,Beilicke, M,Benbow, W,Berger, K,Bird, R,Bugaev, V,Cardenzana, JV,Cerruti, M,Chen, X,Ciupik, L,Dickinson, HJ,Eisch, JD,Errando, M,Falcone, A,Finley, JP,Fleischhack, H,Fortin, P,Fortson, L,Furniss, A,Gerard, L,Gillanders, GH,Griffiths, ST,Grube, J,Gyuk, G,Hakansson, N,Holder, J,Humensky, TB,Kar, P,Kertzman, M,Khassen, Y,Kieda, D,Krennrich, F,Kumar, S,Lang, MJ,Maier, G,McCann, A,Meagher, K,Moriarty, P,Mukherjee, R,Nieto, D,de Bhroithe, AO,Ong, RA,Otte, AN,Pohl, M,Popkow, A,Prokoph, H,Pueschel, E,Quinn, J,Ragan, K,Reynolds, PT,Richards, GT,Roache, E,Rousselle, J,Santander, M,Sembroski, GH,Smith, AW,Staszak, D,Telezhinsky, I,Tucci, JV,Tyler, J,Varlotta, A,Vassiliev, VV,Wakel (2015) 'The most powerful flaring activity from the NLSyl PMN J0948+0022'. Monthly Notices Of The Royal Astronomical Society, 446 :2456-2467.en_IE
dc.description.abstractWe 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 Treven_IE
dc.description.sponsorshipThe work of the VERITAS Collaboration is supported by grants from the U.S. Department of Energy Office of Science, the U.S. National Science Foundation and the Smithsonian Institution, by NSERC in Canada, by Science Foundation Ireland (SFI 10/RFP/AST2748) and by the Science and Technology Facilities Council in the U.K.en_IE
dc.publisherOxford University Pressen_IE
dc.relation.ispartofMonthly Notices Of The Royal Astronomical Societyen
dc.subjectQUASAR PKS 1510-089en_IE
dc.subjectGalaxies: active-galaxies: individual: PMN J0948+0022en_IE
dc.subjectGalaxies: nucleien_IE
dc.subjectGalaxies: Seyferten_IE
dc.subjectGamma-rays: generalen_IE
dc.subjectLine Seyfert 1en_IE
dc.subjectGamma ray emissionen_IE
dc.subjectLarge area telescopeen_IE
dc.subjectExtragalactic background lighten_IE
dc.subjectSpectrum radio quasarsen_IE
dc.subjectGalactic nucleien_IE
dc.subjectX rayen_IE
dc.subjectMulti wavelength observationen_IE
dc.subjectRelativistic jectsen_IE
dc.titleThe most powerful flaring activity from the NLSyl PMN J0948+0022en_IE
dc.local.contactMark Lang, School Of Physics, Room 147, Arts/Science Building, Nui Galway. 3241 Email:

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