Chandra detection of ultra-low-luminosity AGNs in nearby galaxies
Abstract
We present Chandra observations of the nuclear region of nearby inactive galaxies. The sample is selected based on the absence or weakness of optical emission lines in the nucleus. X-ray nuclei are detected in four out of six galaxies. This result, along with previous observations, suggests that more than half of galaxies, for which no evidence for nuclear activity is known, possess an ultra-low-luminosity `active' nucleus. X-ray emission from hot gas is detected in at least four galaxies. We estimate the Bondi accretion rate from the gas density, temperature, and central black hole mass and suggest that the accretion luminosity is not simply determined by the Bondi rate.
- Publication:
-
The Interplay Among Black Holes, Stars and ISM in Galactic Nuclei
- Pub Date:
- November 2004
- DOI:
- 10.1017/S1743921304001462
- Bibcode:
- 2004IAUS..222...61T