IGR J22517+2218=MG3 J225155+2217: A New Gamma-Ray Lighthouse in the Distant Universe
IGR J22517+2218=MG3 J225155+2217: A New Gamma-Ray Lighthouse in the Distant Universe
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IGR J22517 2218=MG3 J225155 2217:遥远宇宙中的一座新伽马射线灯塔
DOI:
10.1086/523757
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Bassani L
中科院分区:
文献类型:
--
作者:
Bassani L
We report on the identification of a new soft gamma-ray source, namely, IGR J22517+ 2218, detected with INTEGRAL IBIS. The source, which has an observed 20-100 keV flux of~ 4× 10-11 ergs cm-2 s-1, is spatially coincident with MG3 J225155+ 2217, a quasar at z= 3.668. The Swift XRT 0.5-10 keV continuum is flat (Γ= 1.5) with evidence for a spectral curvature below 1-2 keV either due to intrinsic absorption (N H= 3±2× 10 22 cm-2) or to a change in slope (ΔΓ= 0.5). X-ray observations indicate flux variability over a 6 day period that is further supported by a flux mismatch between Swift and INTEGRAL spectra. IGR J22517+ 2218 is radio-loud and has a flat radio spectrum; optically, it is a broad-line emitting quasar with the atypical property of hosting a narrow-line absorption system. The source spectral energy distribution is unusual compared to blazars of similar type: either it has the synchrotron peak in the X-ray/gamma-ray band (ie, much higher than generally observed) or the Compton peak in the MeV range (ie, lower than typically measured). IGR J22517+ 2218= MG3 J225155+ 2217 is the second most distant blazar detected above 20 keV and a gamma-ray lighthouse shining from the edge of our universe.
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DOI:
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发表时间:
1978
期刊:
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
1997
期刊:
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作者:
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DOI:
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发表时间:
2004
期刊:
arXiv: Optimization and Control
影响因子:
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作者:
A. Moretti;S. Campana;G. Tagliaferri;A. Abbey;R. Ambrosi;L. Angelini;A. Beardmore;H. Brauninger;W. Burkert;D. Burrows;M. Capalbi;G. Chincarini;O. Citterio;G. Cusumano;M. Freyberg;P. Giommi;G. Hartner;J. Hill;K. Mori;D. Morris;K. Mukerjee;J. Nousek;J. Osborne;A. Short;F. Tamburelli;D. Watson;A. Wells
通讯作者:
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DOI:
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发表时间:
2003
期刊:
影响因子:
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作者:
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通讯作者:
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