In this paper, 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. Finally, 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.
D'Ammando, F., et al. "SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy." Monthly Notices of the Royal Astronomical Society, vol. 426, no. 1, Oct. 2012. https://doi.org/10.1111/j.1365-2966.2012.21707.x
D'Ammando, F., Orienti, M., Finke, J., Raiteri, C. M., Angelakis, E., Fuhrmann, L., Giroletti, M., Hovatta, T., Max-Moerbeck, W., Perkins, J. S., Readhead, A. C. S., Richards, J. L., Stawarz, Ł., & Donato, D. (2012). SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy. Monthly Notices of the Royal Astronomical Society, 426(1). https://doi.org/10.1111/j.1365-2966.2012.21707.x
D'Ammando, F., Orienti, M., Finke, J., et al., "SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy," Monthly Notices of the Royal Astronomical Society 426, no. 1 (2012), https://doi.org/10.1111/j.1365-2966.2012.21707.x
@article{osti_1356667,
author = {D'Ammando, F. and Orienti, M. and Finke, J. and Raiteri, C. M. and Angelakis, E. and Fuhrmann, L. and Giroletti, M. and Hovatta, T. and Max-Moerbeck, W. and Perkins, J. S. and others},
title = {SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy},
annote = {In this paper, 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. Finally, 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.},
doi = {10.1111/j.1365-2966.2012.21707.x},
url = {https://www.osti.gov/biblio/1356667},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {1},
volume = {426},
place = {United States},
publisher = {Royal Astronomical Society},
year = {2012},
month = {10}}
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA) (United States); National Inst. for Astrophysics (INAF) (Italy); National Science Foundation (NSF) (United States); USDOE
Contributing Organization:
Fermi LAT Collaboration
OSTI ID:
1356667
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 426; ISSN 0035-8711
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 358, Issue 1767https://doi.org/10.1098/rsta.2000.0560