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a photoionization model for the optical line emission from cooling flowsThe detailed predictions of a photoionization model previously outlined in Voit and Donahue (1990) to explain the optical line emission associated with cooling flows in X-ray emitting clusters of galaxies are presented. In this model, EUV/soft X-ray radiation from condensing gas photoionizes clouds that have already cooled. The energetics and specific consequences of such a model, as compared to other models put forth in the literature is discussed. Also discussed are the consequences of magnetic fields and cloud-cloud shielding. The results illustrate how varying the individual column densities of the ionized clouds can reproduce the range of line ratios observed and strongly suggest that the emission-line nebulae are self-irradiated condensing regions at the centers of cooling flows.
Document ID
19920030078
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Donahue, Megan
(Colorado Univ. Boulder, CO, United States)
Voit, G. M.
(Colorado, University Boulder, United States)
Date Acquired
August 15, 2013
Publication Date
November 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 381
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-766
CONTRACT_GRANT: NSF AST-87-15983
Distribution Limits
Public
Copyright
Other