Journal Article

SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy

F. D'Ammando, M. Orienti, J. Finke, C. M. Raiteri, E. Angelakis, L. Fuhrmann, M. Giroletti, T. Hovatta, W. Max-Moerbeck, J. S. Perkins, A. C. S. Readhead, J. L. Richards, Ł. Stawarz and D. Donato

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 1, pages 317-329
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21707.x
SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy

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Abstract

We report Fermi Large Area Telescope (LAT) observations of the radio-loud active galactic nucleus SBS 0846+513 (z = 0.5835), optically classified as a narrow-line Seyfert 1 galaxy, together with new and archival radio-to-X-ray data. The source was not active at γ-ray energies during the first two years of Fermi operation. A significant increase in activity was observed during 2010 October–2011 August. In particular, a strong γ-ray flare was observed in 2011 June reaching an isotropic γ-ray luminosity (0.1–300 GeV) of 1.0 × 1048 erg s−1, comparable to that of the brightest flat spectrum radio quasars, and showing spectral evolution in γ rays. An apparent superluminal velocity of (8.2 ± 1.5)c in the jet was inferred from 2011 to 2012 Very Long Baseline Array (VLBA) images, suggesting the presence of a highly relativistic jet.

Both the power released by this object during the flaring activity and the apparent superluminal velocity are strong indications of the presence of a relativistic jet as powerful as those of blazars. In addition, variability and spectral properties in radio and γ-ray bands indicate blazar-like behaviour, suggesting that, except for some distinct optical characteristics, SBS 0846+513 could be considered as a young blazar at the low end of the blazar's black hole mass distribution.

Keywords: galaxies: active; galaxies: individual: SBS 0846+513; galaxies: nuclei; galaxies: Seyfert; gamma-rays: general

Journal Article.  9614 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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