SIMBAD references

2006ApJ...642..746B - Astrophys. J., 642, 746-751 (2006/May-2)

O VI observations of galaxy clusters: evidence for modest cooling flows.


Abstract (from CDS):

A prediction of the galaxy-cluster cooling flow model is that as gas cools from the ambient cluster temperature, emission lines are produced in gas at subsequently decreasing temperatures. Gas passing through 105.5 K emits in the lines of O VI λλ1032, 1035, and here we report a FUSE study of these lines in three cooling flow clusters, Abell 426, Abell 1795, and AWM 7. No emission was detected from AWM 7, but O VI is detected from the centers of Abell 426 and Abell 1795, and possibly to the south of the center in Abell 1795, where X-ray and optical emission line filaments lie. In Abell 426 these line luminosities imply a cooling rate of 32±6 M/yr within the central r=6.2 kpc region, while for Abell 1795 the central cooling rate is 26±7 M/yr (within r=22 kpc), and about 42±9 M/yr including the southern pointing. Including other studies, three of six clusters have O VI emission, and they also have star formation as well as emission lines from 104 K gas. These observations are generally consistent with the cooling flow model, but at a rate closer to 30 M/yr than to the originally suggested values of 102-10^ 3^ M/yr.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - Galaxies: Clusters: Individual: Name: Abell 426 - Galaxies: Clusters: Individual: Name: Abell 1795 - Galaxies: Clusters: Individual: Alphanumeric: AWM 7 - Ultraviolet: Galaxies

Status at CDS:  

Simbad objects: 9

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