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