Abstract
view Abstract Citations (380) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Properties of the X-Ray Emitting Gas in Early-Type Galaxies Canizares, Claude R. ; Fabbiano, Giuseppina ; Trinchieri, Ginevra Abstract The authors have studied a sample of 81 E and S0 galaxies that were observed with the Einstein Observatory. Fifty-five galaxies are detected in X-rays, most of which come from a hot interstellar medium. Discrete sources may make a significant contribution to the X-ray emission for 21 of the detected galaxies with the lowest X-ray luminosity LX for a given optical luminosity LB. The authors examine the LX versus LB distribution and derive approximate values of the central electron density, central cooling time, and total mass in gas for the sample. Typical values are ≡0.1 cm-3, ≡5×106yr, and 5×109M_sun;. The short cooling times suggest the presence of cooling flows, and heating by supernovae and by gravitational processes is considered. The question of the presence of heavy halos is briefly discussed. Publication: The Astrophysical Journal Pub Date: January 1987 DOI: 10.1086/164896 Bibcode: 1987ApJ...312..503C Keywords: Emission Spectra; Galactic Evolution; Galactic Structure; Neutral Gases; X Ray Spectra; Astronomical Spectroscopy; Gas Cooling; Supernovae; Visible Spectrum; Astrophysics; GALAXIES: STRUCTURE; GALAXIES: X-RAYS full text sources ADS | data products NED (84) SIMBAD (83)
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