Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440...48d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 440, no. 1, p. 48-59
Astronomy and Astrophysics
Astronomy
32
Astronomical Models, Dark Matter, Galactic Clusters, Galactic Structure, Interstellar Matter, Visible Spectrum, X Ray Astronomy, X Ray Spectra, Astronomical Maps, Astronomical Spectroscopy, Interstellar Gas, Mathematical Models, Orbits, Proportional Counters, Rosat Mission
Scientific paper
X-ray observations of Abell 548 reveal that the hot gas in this cluster is at least as complex as the galaxy distribution. Our ROSAT Position Sensitive Proportional Counter (PSPC) image is used in conjunction with optical data from the Minnesota plate-scanning project and redshift data in the literature to investigate the degree of substructure in the intracluster medium and the galaxy distribution. A548 has several X-ray components: hot gas associated with clumps of galaxies, individual sources, and a newly discovered diffuse component. This diffuse component may be promordial gas falling into the cluster for the first time. The optical data suggest that this cluster consists of four major components, not three (as indicated when velocity data are ignored). Simple models of the orbital dynamics suggest that the cluster may not yet have reached its turnaround radius.
Bird Christina M.
Davis David S.
Mushotzky Richard F.
Odewahn Stephen C.
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