The Fir-Radio Correlation in Nearby Clusters:. Implications for the Radio-To Index Redshift Estimator

Details The Fir-Radio Correlation in Nearby Clusters:. Implications for the Radio-To Index Redshift Estimator The Fir-Radio Correlation in Nearby Clusters:. Implications for the Radio-To Index Redshift Estimator

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf..127m&link_type=abstract

DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am

Astronomy and Astrophysics

Astronomy

Scientific paper

The radio-to-submillimeter spectral index as a redshift indicator is a powerful technique for submm sources1,2. As it is predicated upon the far-infrared-to-radio correlation (FIR-radio correlation), a comprehensive evaluation of this correlation in the nearby universe elucidates the potential uncertainties inherent to the technique. Using a comprehensive data set covering 17 nearby Abell clusters, we assess the FIR-radio correlation of galaxies from the cluster cores out well past the Abell radius. For the majority of galaxies, the FIR-radio correlation is confirmed. This includes AGN, though such objects exhibit increased radio emission relative to that expected from normal star forming objects. A slight excess of radio over-luminous spirals in the cores of clusters is also identified, and high resolution radio imaging confirms that the potential AGN contribution to their radio flux is insignificant. The relative numbers of 'normal' galaxies and outliers to the FIR-radio correlation in nearby clusters may be used to assess the redshift errors from applying the radio-submm spectral index technique to higher redshift galaxies. The power of the technique in statistical studies is confirmed.

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