SIMBAD references

2011ApJ...731...31S - Astrophys. J., 731, 31 (2011/April-2)

Evidence for rapid redshift evolution of strong cluster cooling flows.


Abstract (from CDS):

We present equivalent widths of the [O II]λ3727 and Hα nebular emission lines for 77 brightest cluster galaxies (BCGs) selected from the 160 Square Degree ROSAT X-ray survey. We find no [O II]λ3727 or Hα emission stronger than -15 Å or -5 Å, respectively, in any BCG. The corresponding emission-line luminosities lie below L ∼ 6x1040 erg/s, which is a factor of 30 below that of NGC 1275 in the Perseus Cluster. A comparison to the detection frequency of nebular emission in BCGs at z ≲ 0.35 drawn from the Brightest Cluster Survey indicates that we should have detected roughly one dozen emission-line galaxies, assuming that the two surveys are selecting similar clusters in the X-ray luminosity range 1042 erg/s to 5x1044 erg/s. The absence of luminous nebular emission (i.e., Perseus-like systems) in our sample is consistent with an increase in the number density of strong cooling flow (cooling core) clusters between z = 0.5 and today. The decline in their numbers at higher redshift could be due to cluster mergers and heating by active galactic nuclei.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: clusters: intracluster medium - galaxies: jets - X-rays: galaxies: clusters

Simbad objects: 85

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2011ApJ...731...31S and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact