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The first GeV outburst of the radio-loud narrow-line Seyfert 1 galaxy PKS 1502+036

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dc.contributor.author Paliya, Vaidehi S
dc.contributor.author Stalin, C. S
dc.date.accessioned 2020-11-19T13:43:26Z
dc.date.available 2020-11-19T13:43:26Z
dc.date.issued 2016-03
dc.identifier.citation The Astrophysical Journal, Vol. 820, No. 1, 52 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7252
dc.description Restricted Access © The American Astronomical Society http://dx.doi.org/10.3847/0004-637X/820/1/52 en_US
dc.description.abstract The γ-ray-loud narrow-line Seyfert 1 (γ-NLSy1) galaxy PKS 1502+036 (z = 0.409) exhibited its first γ-ray outburst on 2015 December 20. In the energy range of 0.1–300 GeV, the highest flux measured by the Fermi-Large Area Telescope is (3.90 ± 1.52)×10−6 ph cm s - - 2 1, which is the highest γ-ray flux ever detected from this object. The associated spectral shape is soft (Γ0.1–300 GeV=2.57±0.17) and this corresponds to an isotropic γ-ray luminosity of (1.2 ± 0.6)×1048 erg s−1. We generate the broadband spectral energy distribution (SED) during the GeV flare and reproduce it using a one-zone leptonic emission model. The optical-UV spectrum can be explained by a combination of synchrotron and accretion disk emission, whereas the X-ray-to-γ-ray SED can be satisfactorily reproduced by inverse-Compton scattering of thermal photons that originated from the torus. The derived SED parameters hint that the increase in the bulk Lorentz factor is a major cause of the flare and the location of the emission region is estimated as being outside the broad-line region but still inside the torus. A comparison of the GeV-flaring SED of PKS 1502+036 with that of two other γ-NLSy1 galaxies, namely, 1H 0323+342 (z = 0.061) and PMN J0948+0022 (z = 0.585), and also with flat spectrum radio quasar (FSRQ) 3C 279 (z = 0.536), has led to the conclusion that the GeV-flaring SEDs of γ-NLSy1 galaxies resemble FSRQs and a major fraction of their bolometric luminosities are emitted at γ-ray energies. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Galaxies: active en_US
dc.subject Galaxies: jets en_US
dc.subject Gamma rays: galaxies en_US
dc.subject Quasars: individual (PKS 1502+036) en_US
dc.title The first GeV outburst of the radio-loud narrow-line Seyfert 1 galaxy PKS 1502+036 en_US
dc.type Article en_US


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