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

Journal Article · Thu Jul 10 04:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/789/2/143· OSTI ID:22365679

Paliya, Vaidehi S.; Stalin, C. S. ^[1]; Sahayanathan, S. ^[2]; Parker, M. L.; Fabian, A. C. ^[3]; Anjum, Ayesha ^[4]

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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)

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 Kα 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.

• OSTI ID: 22365679
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 789; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCRETION DISKS
BLACK HOLES
COMPTON EFFECT
EMISSION
ENERGY SPECTRA
GAMMA RADIATION
REFLECTION
SEYFERT GALAXIES
SPACE
SPIN
TELESCOPES
VISIBLE RADIATION
X RADIATION
X-RAY SPECTRA