Automated Galaxy Counts Toward X-ray-Selected Abell Clusters

Details Automated Galaxy Counts Toward X-ray-Selected Abell Clusters Automated Galaxy Counts Toward X-ray-Selected Abell Clusters

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.1007w&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #10.07; Bulletin of the American Astronomical Society, Vol. 31, p.1389

Astronomy and Astrophysics

Astronomy

Scientific paper

We have measured the surface density of galaxies on R-band Digital Sky Survey images toward 18, redshift z<0.1, X-ray-selected Abell clusters. Our automated galaxy counts within 3 Mpc apertures agree well with Abell's counts for richness class 0--2 clusters. However, we find a smaller scatter in the X-ray luminosity--cluster richness relation using galaxy counts within smaller, 1.0--1.5 Mpc apertures compared to counts within the 3 Mpc Abell radius. We find that galaxy counts for distant clusters are likewise most accurate within ≈< 1.5 Mpc apertures, where the ratio of cluster galaxies to background/foreground galaxies is maximal. An expanded sample of nearby clusters selected and analyzed similarly will provide a basis for comparing nearby and distant (i.e. z>0.5) X-ray clusters to study evolution.

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