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 ?-ray energies during the first two years of Fermi operation. A significant increase in activity was observed during 2010 October2011 August. In particular, a strong ?-ray flare was observed in 2011 June reaching an isotropic ?-ray luminosity (0.1300?GeV) of 1.0 X 1048?erg?s-1, comparable to that of the brightest flat spectrum radio quasars, and showing spectral evolution in ? 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 ?-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.
SBS 0846+513: a new gamma-ray-emitting narrow-line Seyfert 1 galaxy / DAmmando F; Orienti M; Finke J; Raiteri CM; Angelakis E; Fuhrmann L; Giroletti M; Hovatta T; Max-Moerbeck W; Perkins JS; Readhead ACS; Richards JL; Stawarz L; Donato D. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - STAMPA. - 426:1(2012), pp. 317-329. [10.1111/j.1365-2966.2012.21707.x]
SBS 0846+513: a new gamma-ray-emitting narrow-line Seyfert 1 galaxy
D'AMMANDO, FILIPPO;
2012
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 ?-ray energies during the first two years of Fermi operation. A significant increase in activity was observed during 2010 October2011 August. In particular, a strong ?-ray flare was observed in 2011 June reaching an isotropic ?-ray luminosity (0.1300?GeV) of 1.0 X 1048?erg?s-1, comparable to that of the brightest flat spectrum radio quasars, and showing spectral evolution in ? 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 ?-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.