Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.0503d&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #05.03; Bulletin of the American Astronomical Society, Vol. 25, p.1297
Other
Scientific paper
We have observed two distant clusters, MS0735+74 and MS0451-03, with the PSPC and HRI instruments on board the ROSAT spacecraft. MS0735+74 is a cooling flow candidate at a z=0.216, selected for the extended Hα emission in its brightest central galaxy. MS0451-03, at a redshift of 0.55, is one of the most luminous clusters known with a luminosity of >10(45) erg/sec. We are able to constrain the column density of material able to absorb soft X-rays, and to place interesting limits on the gas temperatures. The MS0735+74 cluster is significantly cooler than predicted by the L_x - T_x relationship for low-redshift clusters. No excess soft absorption, other than that accounted for by 21 cm measurements of our own Galaxy, was seen in these objects. We estimate the core radius and isophotal extents of both galaxies, and estimate the mass cooling rate for MS0735+74. We also compare the Hα surface brightness of the central galaxy of MS0735+74 with the HRI surface brightness contours. Preliminary analyses of the spectra of both clusters seem to indicate no significant soft-X-ray absorption owing to material intrinsic to the cluster, contrary to analyses done on Einstein spectra of other high redshift clusters by Wang & Stocke. However, MS0735+74 is surprisingly cool for its X-ray luminosity. Cooler temperatures for a given X-ray luminosity at redshifts of order 0.3 are predicted by some models of cluster evolution.
Arnaud A. A. K.
Donahue Megan E.
Gioia Isabella Maria
Morris Simon L.
Stocke John T.
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