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arXiv:astro-ph/0008459 (astro-ph)
[Submitted on 29 Aug 2000]

Title:Low-luminosity AGN and Normal Galaxies

Authors:A. Ptak
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Abstract: Low-luminosity AGN (with X-ray luminosity < 1e42 ergs/s) far outnumber ordinary AGN, and are therefore perhaps more relevant to our understanding of AGN phenomena and the relationship between AGN and host galaxies. Many normal galaxies harbor LINER and starburst nuclei, which, together with LLAGN, are a class of ``low-activity'' galaxies that have a number of surprisingly similar X-ray characteristics, despite their heterogenous optical classification. This strongly supports the hypothesis of an AGN-starburst connection. Further, X-ray observations of normal galaxies without starburst or AGN-like activity in their nuclei offer opportunities to study populations of X-ray binaries, HII regions, and warm or hot ISM under different conditions than is often the case in the Milky Way. The results of recent X-ray observations of these types of galaxies are reviewed, and what we hope to learn about both nearby and high redshift galaxies of each type from observations with forthcoming and planned satellites is discussed.
Comments: 10 pages, 7 figures. Invited review at Bologna X-ray Astronomy 1999. To appear in Astrophysical Letters and Communications
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0008459
  (or arXiv:astro-ph/0008459v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0008459
Related DOI: https://doi.org/10.1063/1.1434645

Submission history

From: Andrew Ptak [view email]
[v1] Tue, 29 Aug 2000 16:47:02 UTC (314 KB)
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