X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions

Details X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions

1997-02-06

arxiv.org/abs/astro-ph/9702069v1

Astronomy and Astrophysics

Astrophysics

Submitted to ApJL, 9 pages including 2 figures

Scientific paper

Based on ROSAT PSPC pointed observations, we have determined the aggregate X-ray shapes of 10 distant (z = 0.17-0.54) rich clusters: A2397, A222, A520, A1689, A223B, A1758, A2218, A2111, A2125, and CL0016+16. Four of the clusters have global X-ray ellipticities greater than 0.2, as measured on a scale of diameter 3 h_{50}^{-1} Mpc. These strongly elongated clusters tend to show substantial amounts of substructure, indicating that they are dynamically young systems. Most interestingly, the global X-ray ellipticities of the clusters correlate well with their blue galaxy fractions; the correlation coefficient is 0.75 with a 90% confidence range of 0.44-0.92. This correlation suggests that blue cluster galaxies originate in the process of cluster formation, and that the blue galaxy proportion of a cluster decreases as the intracluster medium relaxes onto equipotential surfaces.

Affiliated with

Also associated with

No associations

Rating

X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-618540