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Empirical Links between XRB and AGN accretion using the complete z<0.4 spectroscopic CSC/SDSS Catalog

Authors :
Trichas, Markos
Green, Paul
Constantin, Anca
Aldcroft, Tom
Sobolewska, Malgosia
Hyde, Ashley K.
Zhou, Hongyan
Kim, Dong-Woo
Haggard, Daryl
Kelly, Brandon
Kalfountzou, Eleni
Publication Year :
2013

Abstract

Striking similarities have been seen between accretion signatures of Galactic X-ray binary (XRB) systems and active galactic nuclei (AGN). XRB spectral states show a V-shaped correlation between X-ray spectral hardness and Eddington ratio as they vary, and some AGN samples reveal a similar trend, implying analogous processes at vastly larger masses and timescales. To further investigate the analogies, we have matched 617 sources from the Chandra Source Catalog to SDSS spectroscopy, and uniformly measured both X-ray and optical spectral characteristics across a broad range of AGN and galaxy types. We provide useful tabulations of X-ray spectral slope for broad and narrow line AGN, star-forming and passive galaxies and composite systems, also updating relationships between optical (Ha and [OIII]) line emission and X-ray luminosity. We further fit broadband spectral energy distributions with a variety of templates to estimate bolometric luminosity. Our results confirm a significant trend in AGN between X-ray spectral hardness and Eddington ratio expressed in X-ray luminosity, albeit with significant dispersion. The trend is not significant when expressed in the full bolometric or template-estimated AGN luminosity. We also confirm a relationship between the X-ray/optical spectral slope aox, and Eddington ratio, but it may not follow the trend predicted by analogy with XRB accretion states.&lt;br /&gt;Comment: 12 pages, 10 figures, submitted to ApJ. Full online table will be provided via ApJ

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1306.0594
Document Type :
Working Paper
Full Text :
https://doi.org/10.1088/0004-637X/778/2/188