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The X-ray surface brightness distribution and spectral properties of six early-type galaxiesDetailed analysis is presented of the Einstein X-ray observations of six early-type galaxies. The results show that effective cooling is probably present in these systems, at least in the innermost regions. Interaction with the surrounding medium has a major effect on the X-ray surface brightness distribution at large radii, at least for galaxies in clusters. The data do not warrant the general assumptions of isothermality and gravitational hydrostatic equilibrium at large radii. Comparison of the X-ray surface brightness profiles with model predictions indicate that 1/r-squared halos with masses of the order of 10 times the stellar masses are required to match the data. The physical model of White and Chevalier (1984) for steady cooling flows in a King law potential with no heavy halo gives a surface brightness distribution that resembles the data if supernovae heating is present.
Document ID
19870036589
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Trinchieri, G.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Arcetri, Osservatorio Astrofisico Florence, Italy)
Fabbiano, G.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Canizares, C. R.
(MIT Cambridge, MA, United States)
Date Acquired
August 13, 2013
Publication Date
November 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 310
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A23863
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
CONTRACT_GRANT: NAG8-494
Distribution Limits
Public
Copyright
Other

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