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

Abstract

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 × 10 48 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 amore » young blazar at the low end of the blazar's black hole mass distribution.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Sponsoring Org.:
USDOE; National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); National Inst. for Astrophysics (INAF) (Italy)
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1356667
Grant/Contract Number:  
NNX08AW31G; NNX11A043G; AST-0808050; AST-1109911; ASI-INAF I/009/10/0
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 426; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; active galaxies; galaxies; nuclei; Seyfert galaxies; gamma-rays

Citation Formats

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., and Donato, D. SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy. United States: N. p., 2012. Web. doi: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. SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy. United States. doi: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., and Donato, D. Thu . "SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy". United States. doi:10.1111/j.1365-2966.2012.21707.x. https://www.osti.gov/servlets/purl/1356667.
@article{osti_1356667,
title = {SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy},
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 Readhead, A. C. S. and Richards, J. L. and Stawarz, Ł. and Donato, D.},
abstractNote = {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},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 426,
place = {United States},
year = {2012},
month = {10}
}

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