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The interaction between hot and cold gas in early-type galaxiesSO and Sa galaxies have approximately equal masses of H I and X-ray emitting gas and are ideal sites for studying the interaction between hot and cold gas. An X-ray observation of the Sa galaxy NGC 1291 with the ROSAT position sensitive proportional counter (PSPC) shows a striking spatial anticorrelation between hot and cold gas where X-ray emitting material fills the large central black hole in the H I disk. This supports a previous suggestion that hot gas is a bulge phenomenon and neutral hydrogen is a disk phenomenon. The X-ray luminosity (1.5 x 10(exp 40) ergs/s) and radial surface brightness distribution (beta = 0.51) is the same as for elliptical galaxies with optical luminosities and velocity dispersions like that of the bulge of NGC 1291. Modeling of the X-ray spectrum requires a component with a temperature of 0.15 keV, similar to that expected from the velocity dispersion of the stars, and with a hotter component where kT = 1.07 keV. This hotter component is not due to emission from stars and its origin remains unclear. PSPC observations are reported for the SO NGC 4203, where a nuclear point source dominates the emission, preventing a study of the radial distribution of the hot gas relative to the H I.
Document ID
19950049056
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bregman, Joel N.
(Univ. of Michigan, Ann Arbor, MI United States)
Hogg, David E.
(NRAO, Charlottesville, VA United States)
Roberts, Morton S.
(NRAO, Charlottesville, VA United States)
Date Acquired
August 16, 2013
Publication Date
March 10, 1995
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 441
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A80655
Funding Number(s)
CONTRACT_GRANT: NAGW-2135
CONTRACT_GRANT: NAG5-1955
Distribution Limits
Public
Copyright
Other

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