Evidence for Rapid Redshift Evolution of Strong Cluster Cooling Flows

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Accepted for publication in ApJ

Scientific paper

We present equivalent widths of the [OII] and Ha nebular emission lines for 77 brightest cluster galaxies (BCGs) selected from the 160 Square Degree $ROSAT$ X-ray survey. We find no [OII] or Ha emission stronger than -15 angstroms or -5 angstroms, respectively, in any BCG. The corresponding emission line luminosities lie below 6E40 erg/s, which is a factor of 30 below that of NGC1275 in the Perseus cluster. A comparison to the detection frequency of nebular emission in BCGs lying at redshifts above z = 0.35 drawn from the Brightest Cluster Survey (Crawford et al. 1999) indicates that we should have detected roughly one dozen emission-line galaxies, assuming the two surveys are selecting similar clusters in the X-ray luminosity range 10E42 erg/s to 10E45 erg/s. The absence of luminous nebular emission (ie., Perseus-like systems) in our sample is consistent with an increase in the number density of {\it strong} cooling flow (cooling core) clusters between $\rm z=0.5$ and today. The decline in their numbers at higher redshift could be due to cluster mergers and AGN heating.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Evidence for Rapid Redshift Evolution of Strong Cluster Cooling Flows 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 Evidence for Rapid Redshift Evolution of Strong Cluster Cooling Flows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for Rapid Redshift Evolution of Strong Cluster Cooling Flows will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-418395

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.