Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312207r&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #122.07; Bulletin of the American Astronomical Society, Vol. 31, p.665
Other
Scientific paper
The radio and FIR properties of galaxies in the seven nearest clusters with prominent X-ray emission are examined to investigate the impact of the cluster environment on the star formation and AGN activity. The candidate clusters are Abell 262, Perseus, Fornax, Hydra, Abell 1367, Virgo, and Coma. The sample extends to z=0.023 and is complete to a limit of S{60μ m} = 80 mJy with 226 likely cluster members. All sources have L{60μ m} < 1011 Lsun contrasted with the field, where 11% of galaxies are brighter in the infrared. Therefore, the most luminous infrared galaxies are under-represented in these clusters. A single Schechter function describes both the radio and FIR luminosity functions reasonably well. For 6 of the 7 clusters, no trend or correlation is found between projected radius and L1.4GHz and L{60μ m}. In Virgo cluster, where a large number of low luminosity galaxies (L{60 μm }=107.7-8.5 Lsun) are detected, clear evidence for the paucity of IR and radio sources in the inner 0.5 Mpc radius is found. Similar avoidance of the central Mpc may also be present in other clusters, but the sensitivity of the IRAS data is not sufficient to detect the faint IR sources in most cases. An analysis of the radio-to-FIR flux ratio, ``q parameter", reveals that the distribution of the q value has many similarities to that of the field sample as determined by Yun, Reddy, & Condon. The fraction of ``radio-excess" objects (defined as having at least five times more radio luminosity than expected from radio-FIR correlation) is 9% above the 60 μ m luminosity completeness limit of 109 Lsun. This is 9 times larger than the field (about 1%), and this explains the average of factor two enhancement in radio emission over the field: cluster=2.09 and
field=2.34). The lower value of qcluster may be attributable to enhanced radio continuum emission by the cluster magnetic field or by elevated AGN activity in the cluster environment or reduced FIR emission by ISM stripping. Of the 226 total sources, 48 are within R=0.5 Mpc of the cluster center (12 early-type and 36 late-type galaxies) and, of the radio-excess objects, 6 of 11 are core galaxies. We conclude that the core cluster galaxies are as likely to be forming stars as the late-type and ring cluster galaxies.
Reddy Naveen A.
Yun Min. S.
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