The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en D'Ammando, F. Orienti, M. Finke, J. Hovatta, T. Giroletti, M. Max-Moerbeck, W. Pearson, T. J. Readhead, A. C. S. Reeves, R. A. Richards, J. L. 2017-03-28T12:12:46Z 2017-03-28T12:12:46Z 2016-12
dc.identifier.citation D'Ammando , F , Orienti , M , Finke , J , Hovatta , T , Giroletti , M , Max-Moerbeck , W , Pearson , T J , Readhead , A C S , Reeves , R A & Richards , J L 2016 , ' The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036 ' Monthly Notices of the Royal Astronomical Society , vol 463 , no. 4 , pp. 4469-4480 . DOI: 10.1093/mnras/stw2325 en
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966
dc.identifier.other PURE UUID: 7ebbe64c-8a7a-4fb0-b277-d4d39b07cf10
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description.abstract After a long low-activity period, a γ-ray flare from the narrow-line Seyfert 1 PKS 1502+036 (z = 0.4089) was detected by the Large Area Telescope (LAT) on board Fermi in 2015. On 2015 December 20, the source reached a daily peak flux, in the 0.1-300 GeV band, of (93 ± 19) × 10-8 ph cm-2 s-1, attaining a flux of (237 ± 71) × 10-8 ph cm-2 s-1 on 3-h time-scales, which corresponds to an isotropic luminosity of (7.3 ± 2.1) × 1047 erg s-1. The γ-ray flare was not accompanied by significant spectral changes. We report on multiwavelength radio-to-γ-ray observations of PKS 1502+036 during 2008 August-2016 March by Fermi-LAT, Swift, XMM-Newton, Catalina Real-Time Transient Survey and the Owens Valley Radio Observatory (OVRO). An increase in activity was observed on 2015 December 22 by Swift in optical, UV and X-rays. The OVRO 15 GHz light curve reached the highest flux density observed from this source on 2016 January 12, indicating a delay of about three weeks between the γ-ray and 15 GHz emission peaks. This suggests that the γ-ray-emitting region is located beyond the broad-line region. We compared the spectral energy distribution (SED) of an average activity state with that of the flaring state. The two SED, with the high-energy bump modelled as an external Compton component with seed photons from a dust torus, could be fitted by changing the electron distribution parameters as well as the magnetic field. The fit of the disc emission during the average state constrains the black hole mass to values lower than 108 M⊙. The SED, high-energy emission mechanisms and γ-ray properties of the source resemble those of a flat spectrum radio quasar. en
dc.format.extent 12
dc.format.extent 4469-4480
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Monthly Notices of the Royal Astronomical Society en
dc.relation.ispartofseries Volume 463, issue 4 en
dc.rights openAccess en
dc.subject.other 115 Astronomy and space science en
dc.title The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036 en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Università degli Studi di Bologna
dc.contributor.department INAF Istituto di Radioastronomia
dc.contributor.department US Naval Research Laboratory
dc.contributor.department Metsähovi Radio Observatory
dc.contributor.department Max-Planck-Institut für Radioastronomie
dc.contributor.department California Institute of Technology
dc.contributor.department Universidad de Concepcion
dc.contributor.department Purdue University
dc.subject.keyword galaxies: individual: PKS 1502+036
dc.subject.keyword galaxies: jets
dc.subject.keyword galaxies: nuclei
dc.subject.keyword galaxies: Seyfert
dc.subject.keyword gamma-rays: general
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201703283249
dc.identifier.doi 10.1093/mnras/stw2325
dc.type.version publishedVersion

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