Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084..204w&link_type=abstract
In NASA, Ames Research Center, The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 204-205 (SEE N91-
Other
Cosmic Gases, Dispersing, Galactic Clusters, Galaxies, Intergalactic Media, Losses, Luminosity, Velocity Distribution, X Rays, Cold Gas, Emission, Halos, Infrared Radiation, Metallicity, Populations, Stellar Mass
Scientific paper
The x ray luminosities of early-type galaxies are correlated with their optical (e.g., blue) luminosities (LX approx. LB exp 1.6), but the x ray luminosities exhibit considerable scatter for a given optical luminosity LB. This dispersion in x ray luminosity is much greater than the dispersion of other properties of early-type galaxies (for a given LB), such as luminosity scale-length, velocity dispersion, color, and metallicity. Here, researchers consider several possible sources for the dispersion in x ray luminosity. Some of the scatter in x ray luminosity may result from stellar population variations between galaxies with similar LB. Since the x ray emitting gas is from accumulated stellar mass loss, the LX dispersion may be due to variations in integrated stellar mass loss rates. Another possible cause of the LX dispersion may be variations in the amount of cool material in the galaxies; cool gas may act as an energy sink for the hot gas. Infrared emission may be used to trace such cool material, so researchers look for a correlation between the infrared emission and the x ray emission of early-type galaxies at fixed LB. Velocity dispersion variations between galaxies of similar LB may also contribute to the LX dispersion. The most likely a priori source of the dispersion in LX is probably the varying amount of ram-pressure stripping in a range of galaxy environments. The hot gaseous halos of early-type galaxies can be stripped in encounters with other galaxies or with ambient cluster gas if the intracluster gas is sufficiently dense. Researchers find that the most likely cause of dispersion in the x ray properties of early type galaxies is probably the ram-pressure stripping of gaseous halos from galaxies. For a sample of 81 early-type galaxies with x ray luminosities or upper limits derived from Einstein Observatory observations (CFT) researchers calculated the cumulative distribution of angular distances between the x ray sample members and bright galaxies from the Revised Shapley - Ames catalog. Collectively, galaxies with low x ray luminosities (for a given LB) tend to be in denser environments than galaxies with higher x ray luminosities.
Sarazin Craig L.
White Raymond Edwin III
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