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Post Info TOPIC: SBS 0846+513
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RE: SBS 0846+513
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Title: To be or not to be a blazar. The case of the Narrow-Line Seyfert 1 SBS 0846+513
Authors: F. D'Ammando (Dip. di Fisica, Università degli Studi di Perugia and INFN), M. Orienti (Dip. di Astronomia, Università di Bologna and INAF-IRA), J. Finke (U.S. Naval Research Laboratory) on behalf of the Fermi-LAT Collaboration

The presence of a relativistic jet in some radio-loud Narrow-Line Seyfert 1s (NLSy1) galaxies, first suggested by their variable radio emission and the flat radio spectra, is now confirmed by the Fermi-LAT detection of five NLSy1s in gamma rays. In particular, a strong gamma-ray flare from SBS 0846+513 was observed in 2011 June by Fermi-LAT reaching a gamma-ray luminosity (0.1-300 GeV) of about 10^48 erg/s, comparable to that of bright flat spectrum radio quasars. Apparent superluminal velocity in the jet was inferred from 2011-2012 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 indicators of the presence of a relativistic jet as powerful as those in blazars. In addition, variability and spectral properties in radio and gamma-ray bands indicate a 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.

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Blobrana


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Posts: 131433
Date:
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Title: SBS 0846+513: a new gamma-ray emitting Narrow-Line Seyfert 1 galaxy
Authors: F. D'Ammando (Dip. di Fisica, Univ. Perugia, INAF-IRA, CIFS), M. Orienti (Dip. di Astronomia, Univ. Bologna, INAF-IRA), J. Finke (U. S. Naval Research Laboratory), C. M. Raiteri (INAF-OATo), E. Angelakis (MPIfR), L. Fuhrmann (MPIfR), M. Giroletti (INAF-IRA), T. Hovatta (Cahill Center for Astronomy and Astrophysics), W. Max-Moerbeck (Cahill Center for Astronomy and Astrophysics), J. S. Perkins (Univ. of Maryland, CRESST), A. C. S. Readhead (Cahill Center for Astronomy and Astrophysics), J. L. Richards (Dep. of Physics, Purdue University), L. Stawarz (JAXA, Astronomical Observatory, Jagiellonian University), D. Donato (Univ. of Maryland, CRESST)

We report Fermi-LAT observations of the radio-loud AGN 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 gamma-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 gamma-ray flare was observed in 2011 June reaching an isotropic gamma-ray luminosity (0.1-300 GeV) of 1.0x10^48 erg/s, comparable to that of the brightest flat spectrum radio quasars, and showing spectral evolution in gamma rays. An apparent superluminal velocity of (8.2±1.5)c in the jet was inferred from 2011-2012 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 gamma-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.

Read more (308kb, PDF)



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