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Matches with IRAS sources

Radio Sources in the 2dF Galaxy Redshift Survey. I. Radio source populations1

Elaine M. Sadler , V.J. McIntyre , C.A. Jackson , R.D. Cannon, PASA, 16 (3), 247.

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Matches with IRAS sources

We expect many of the SF radio sources to be IRAS detections, based on the well-known correlation between radio continuum and far-infrared (FIR) luminosities (e.g. Wunderlich et al. 1987, Condon et al. 1991). For spiral galaxies,

$S_{60\mu{\rm m}} \sim 100\, S_{\rm 1.4\,GHz}$ (e.g. Condon & Broderick 1988, Rowan-Robinson et al. 1993), so NVSS should detect most galaxies in the IRAS Faint Source Catalog (which has a flux density limit of 0.28Jy at $60\mu{\rm m}$).

Of the 36 galaxies classified as SF in Tableб 2, two (TGN222Z132 and XGN221Z023) lie in the 3% of the sky which has no IRAS coverage (Beichman et al. 1985). Of the remaining 34 galaxies, 27 (i.e. 79%) are detected at 60$\mu $m in the IRAS Point Source Catalog or Faint Source Catalog (FSC). Figureб 7 compares the radio continuum (1.4GHz) and IRAS ($60\mu{\rm m}$) flux densities for these galaxies (for galaxies undetected by IRAS we show an upper limit of 0.28Jy, corresponding to the completeness level of the FSC). If we exclude one galaxy with anomalously strong 60$\mu $m emission as discussed below, the mean FIR-radio ratio Q60 = S$_{60\mu m}$/S1.4 GHz for the IRAS-detected galaxies is 112$\pm$8, i.e. close to that derived from other studies.

One galaxy (TMS206Z015) has an unusually high value of Q60=380, with much stronger FIR emission than would be expected from the radio continuum flux density. The most likely explanation is confusion in the IRAS beam, since this galaxy lies in a group and appears to be interacting with a companion.


Next Section: Conclusions
Title/Abstract Page: Radio Sources in the
Previous Section: Two kinds of radio
Contents Page: Volume 16, Number 3

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