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Chandra detection of ultra-low-luminosity AGNs in nearby galaxies

Published online by Cambridge University Press:  24 November 2004

Y. Terashima ,
L. C. Ho  and
J. S. Ulvestad
Y. Terashima
Affiliation:
Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan email: [email protected]
L. C. Ho
Affiliation:
The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101-1292, USA
J. S. Ulvestad
Affiliation:
National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA
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Abstract

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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.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
ORAL CONTRIBUTIONS
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS222 , March 2004 , pp. 61 - 64
Copyright
© 2004 International Astronomical Union