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Title: The peculiar radio-loud narrow line seyfert 1 galaxy 1H 0323+342
Authors: Paliya, Vaidehi S
Sahayanathan, S
Parker, M. L
Fabian, A. C
Stalin, C. S
Anjum, A
Pandey, S. B
Keywords: Galaxies;Active - Galaxies;Individual (1H 0323+342) — Galaxies;Jets - Galaxies;Peculiar — Galaxies;Seyfert
Issue Date: 10-Jul-2014
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 789, No. 2, 143
Abstract: We present a multi-wavelength study of the radio-loud narrow line Seyfert 1 galaxy (NLSy1), 1H 0323+342, detected by Fermi Gamma Ray Space Telescope. Multi-band light curves show many orphan X-ray and optical flares having no corresponding {\gamma}-ray counterparts. Such anomalous variability behavior can be due to different locations of the emission region from the central source. During a large flare, {\gamma}-ray flux doubling time scale as small as ∼ 3 hours is noticed. We built spectral energy distribution (SED) during different activity states and modeled them using an one-zone leptonic model. The shape of the optical/UV component of the SEDs is dominated by accretion disk emission in all the activity states. In the X-ray band, significant thermal emission from the hot corona is inferred during quiescent and first flaring states, however, during subsequent flares, non-thermal jet component dominates. The {\gamma}-ray emission in all the states can be well explained by inverse-Compton scattering of accretion disk photons reprocessed by the broad line region. The source showed violent intra-night optical variability, coinciding with one of the high {\gamma}-ray activity states. An analysis of the overall X-ray spectrum fitted with an absorbed power-law plus relativistic reflection component hints for the presence of Fe K-{\alpha} line and returns a high black hole spin value of a=0.96 ± 0.14. We argue that 1H 0323+342 possesses dual characteristics, akin to flat spectrum radio quasars (FSRQs) as well as radio-quiet NLSy1s, though at a low jet power regime compared to powerful FSRQs.
Description: Open Access
ISSN: 0004-637X
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