Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4905b&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #49.05; Bulletin of the American Astronomical Society, Vol. 29, p.1292
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained an optically flux-limited sample of early-type galaxies observed with the ROSAT PSPC and HRI with the goal of testing the present picture of cooling flow ellipticals. We identify a stellar X-ray component that is prominent in the X-ray fainter galaxies, and when this component is removed, a steep relationship is found between the X-ray and optical luminosities due to the gaseous emission; the slope m = 3.0-3.5 in the L_x ~L_B(m) relationship, with a large dispersion about the correlation. We confirm the previously discovered correlation between the X-ray temperature and velocity dispersion temperature, although with a slightly steeper relationship, T_x ~Tsigma (n), where n = 1.43+/-0.21. These results are inconsistent with predictions of the standard cooling flow model for elliptical galaxies and we suggest a modification of the model that places environment in a central role in determining the X-ray emission properties. In our model, galaxies try to drive galactic winds, which are selectively stifled by the ambient medium in moderate richness environments, leading to hotter and more luminous systems, as observed.
Bregman Joel N.
Brown Alex B.
No associations
LandOfFree
The Environmental Role in Observed X-Ray Emission from Early-Type Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Environmental Role in Observed X-Ray Emission from Early-Type Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Environmental Role in Observed X-Ray Emission from Early-Type Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1174314