High energy X-ray observations of NGC 5506

We have a continuing programme of spectral and temporal studies of a variety of galactic and extragalactic sources in the 20–200 keV band using a large area scintillation counter telescope. The observations of NGC 5506, a Seyfert type 2 galaxy, taken on three occasions during the 1998–2000 period su...

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Bibliographic Details
Published in:Advances in space research 2006, Vol.38 (7), p.1387-1392
Main Author: Manchanda, R.K.
Format: Article
Language:English
Subjects:
Binary black hole
NGC 5506
Seyfert galaxies
X-rays
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Summary:We have a continuing programme of spectral and temporal studies of a variety of galactic and extragalactic sources in the 20–200 keV band using a large area scintillation counter telescope. The observations of NGC 5506, a Seyfert type 2 galaxy, taken on three occasions during the 1998–2000 period suggest that not only source luminosity varies by a factor of ∼10, but also there is a marked change in the spectral index. The data is consistent with a systematic long-term periodic variation. Our analysis of the all sky monitor light curve suggests a 41.12-day period in the source intensity. This paper presents the spectral parameters in the hard X-ray region and proposes that the observed behaviour of the source can be explained on the basis of a binary black hole model for the core activity of the source.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2005.08.044