Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jhu..rept.....k&link_type=abstract
Final Technical Report Johns Hopkins Univ., Baltimore, MD. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astrophysics
Brightness Distribution, Cooling Flows (Astrophysics), Density Distribution, Elliptical Galaxies, Emission Spectra, Galactic Clusters, Galaxies, Particle Density (Concentration), Satellite Observation, Spectrum Analysis, Temperature Profiles, X Ray Astronomy, X Rays, Astronomical Models, Cold Gas, Data Reduction, Intergalactic Media, Isothermal Processes, Mass Flow Rate, Proportional Counters, Rosat Mission, Temperature Measurement
Scientific paper
We observed three poor clusters with central dominant galaxies (AWM 4, MKW 4, and MKW 3's) using the Position Sensitive Proportional Counter on the ROSAT X-ray satellite. The images reveal smooth, symmetrical X-ray emission filling the cluster with a sharp peak on each central galaxy. The cluster surface brightness profiles can be decomposed using superposed King models for the central galaxy and the intracluster medium. The King model parameters for the cluster portions are consistent with previous observations of these clusters. The newly measured King model parameters for the central galaxies are typical of the X-ray surface brightness distributions of isolated elliptical galaxies. Spatially resolved temperature measurements in annular rings throughout the clusters show a nearly isothermal profile. Temperatures are consistent with previously measured values, but are much better determined. There is no significant drop in temperature noted in the innermost bins where cooling flows are likely to be present, nor is any excess absorption by cold gas required. All cold gas columns are consistent with galactic foreground absorption. We derive mass profiles for the clusters assuming both isothermal temperature profiles and cooling flow models with constant mass flow rates. Our results are consistent with previous Einstein IPC observations by Kriss, Cioffi, & Canizares, but extend the mass profiles out to 1 Mpc in these poor clusters.
Dillingham Stephen
Kriss Gerard Anthony
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