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Title: The peculiar radio-loud narrow line Seyfert 1 galaxy 1H 0323+342

We present a multiwavelength study of the radio-loud narrow-line Seyfert 1 galaxy (NLSy1) 1H 0323+342, detected by the Fermi Gamma-Ray Space Telescope. Multiband light curves show many orphan X-ray and optical flares having no corresponding γ-ray counterparts. Such anomalous variability behavior can be due to different locations of the emission region from the central source. During a large flare, a γ-ray flux doubling timescale as small as ∼3 hr is noticed. We built spectral energy distributions (SEDs) during different activity states and modeled them using a 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, the nonthermal jet component dominates. The γ-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 γ-ray activity states. An analysis of the overall X-ray spectrum fitted with an absorbed power-law plus relativistic reflection component hints at the presence of an Fe Kαmore » 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 both flat-spectrum radio quasars (FSRQs) and radio-quiet NLSy1 galaxies, though at a low jet power regime compared to powerful FSRQs.« less
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5]
  1. Indian Institute of Astrophysics, Block-II, Koramangala, Bangalore-560034 (India)
  2. Astrophysical Science Division, Bhabha Atomic Research Center, Mumbai-400085 (India)
  3. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA (United Kingdom)
  4. Department of Physics, Christ University, Bangalore-560029 (India)
  5. Aryabhatta Research Institute of Observational Sciences, Manora peak, Nainital-263129 (India)
Publication Date:
OSTI Identifier:
22365679
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 789; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; BLACK HOLES; COMPTON EFFECT; EMISSION; ENERGY SPECTRA; GAMMA RADIATION; REFLECTION; SEYFERT GALAXIES; SPACE; SPIN; TELESCOPES; VISIBLE RADIATION; X RADIATION; X-RAY SPECTRA