Mathematics – Logic
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8309h&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #83.09; Bulletin of the American Astronomical Society, Vol. 27, p.1408
Mathematics
Logic
Scientific paper
A signature in the distribution of hot gas in elliptical galaxies will be created by the inflow of material (the cooling flow) or by galaxy-galaxy interactions, so we have searched for these signatures through a careful morphological study of the X-ray emission. We examined the X-Ray emission from several bright ellipticals that are not in the centers of clusters and whose X-Ray emission is not dominated by AGN activity. These galaxies have been observed with the {ROSAT} HRI, an instrument with a resolution of about 5arcsec , whose sensitivity is much better than its predecessor on the {Einstein} observatory. A crucial part of our data analysis is the use of image simulations to quantify the morphology of these galaxies. If there are no competing effects, the X-ray gas will follow the gravitational potential of the galaxy and will allow for a calculation of the mass of the galaxy if there is corresponding kinematic data. High rotation velocities, as seen in NGC 1395 and NGC 1404, will affect the shape of the X-ray isophotes by flattening them along the axis of rotation, and we find evidence of this. Recent merger events may also disturb the structure of the ISM, but as of yet, no correlation between the morphology of the X-ray and optical isophotes in elliptical shell galaxies has been seen.
Bregman Joel N.
Hanlan Patricia C.
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