Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 399, Issue 1, Pages 349-356Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15277.x
Keywords
accretion, accretion discs; galaxies: active; galaxies: nuclei; X-rays: galaxies
Categories
Funding
- National Science Foundation of China [10633010, 10703009, 10833002, 10773020, 10821302]
- 973 Programme [2009CB824800]
- CAS [KJCX2-YW-T03]
Ask authors/readers for more resources
We find a significant anticorrelation between the hard X-ray photon index Gamma and the Eddington ratio L-bol/L-Edd for a sample of low-ionization nuclear emission-line regions and local Seyfert galaxies, compiled from literature with Chandra or XMM-Newton observations. This result is in contrast with the positive correlation found in luminous active galactic nuclei (AGN), while it is similar to that of X-ray binaries (XRBs) in the low/hard state. Our result is qualitatively consistent with the spectra produced from advection-dominated accretion flows (ADAFs). It implies that the X-ray emission of low-luminosity active galactic nuclei (LLAGN) may originate from the Comptonization process in ADAF, and the accretion process in LLAGN may be similar to that of XRBs in the low/hard state, which is different from that in luminous AGN.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available