Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..637t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 637-659.
Astronomy and Astrophysics
Astrophysics
172
Astronomical Spectroscopy, Brightness Distribution, Galactic Structure, X Ray Astronomy, Cooling Flows (Astrophysics), Density Distribution, Heao 2, Interstellar Gas, Mass Distribution, Spectrum Analysis
Scientific paper
Detailed 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.
Canizares Calude R.
Fabbiano Giuseppina
Trinchieri Ginevra
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