A deep ROSAT survey - VIII. X-ray detection of the evolved galaxy cluster 0055-279

Details A deep ROSAT survey - VIII. X-ray detection of the evolved galaxy cluster 0055-279 A deep ROSAT survey - VIII. X-ray detection of the evolved galaxy cluster 0055-279

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276..706r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 3, pp. 706-714.

Astronomy and Astrophysics

Astronomy

6

Surveys, Galaxies: Clusters: Individual: 0055-279, Cooling Flows, Galaxies: Evolution, X-Rays: Galaxies

Scientific paper

On a deep (49-ks) ROSAT pointing near the South Galactic Pole, we detect an extended X-ray source, with hard X-ray colours, at a position corresponding to the 0055-279 galaxy cluster. Previous optical investigations indicated that this cluster is at a high redshift of z=0.561 and possesses a much higher fraction of blue spiral galaxies than do local rich clusters. The observed X-ray luminosity of L_X(0.5-2.0 keV)~=10^44 erg s^-1 is only slightly lower than the L_X(0.5-2.0 keV)~=1.5x10^44 erg s^-1 luminosity expected for a local cluster of the same richness. Our results therefore support recent findings that Butcher-Oemler clusters, observed at earlier stages of evolution when they still contain blue spiral galaxies, produce high X-ray luminosities similar to those of present-day rich clusters. We also find that the spectral energy distribution of the 0055-279 cluster shows evidence of stronger absorption at soft energies than would be expected from Galactic hydrogen, suggesting that there is significant (N_H<~10^20 cm^-2) neutral hydrogen absorption within the cluster itself. This may indicate the presence of a cooling flow. The detection of a high-redshift cluster with the observed flux of 0055-279 in our survey area and the numbers of z<~0.5 clusters detected on ROSAT images by Castander et al. are consistent with no evolution of the cluster X-ray luminosity function to z~0.6.

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