Kavli Affiliate: Claudio Ricci
| First 5 Authors: Kriti Kamal Gupta, Kriti Kamal Gupta, , ,
| Summary:
Active galactic nuclei (AGN) emit radiation via accretion across the entire
energy spectrum. While the standard disk and corona model can somewhat describe
this emission, it fails to predict specific features such as the soft X-ray
excess, the short-term optical/UV variability, and the observed UV/X-ray
correlation in AGN. In this context, the fraction of AGN emission in different
bands (i.e., bolometric corrections) can be useful to better understand the
accretion physics of AGN. Past studies have shown that the X-ray bolometric
corrections are strongly dependent on the physical properties of AGN, such as
their luminosities and Eddington ratios. However, since these two parameters
depend on each other, it has been unclear which is the main driver of the X-ray
bolometric corrections. We present here results from a large study of hard
X-ray-selected (14-195 keV) nearby ($z<0.1$) AGN. Based on our systematic
analysis of the simultaneous optical-to-X-ray spectral energy distributions of
236 unobscured AGN, we found that the primary parameter controlling the X-ray
bolometric corrections is the Eddington ratio. Our results show that while the
X-ray bolometric correction increases with the bolometric luminosity for
sources with intermediate Eddington ratios ($0.01-1$), this dependence vanishes
for sources with lower Eddington ratios ($<0.01$). This could be used as
evidence for a change in the accretion physics of AGN at low Eddington ratios.
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