Radio emission from dusty galaxies observed by AKARI

• Far-infrared–radio correlation confirmed by AKARI All-Sky Survey for local galaxies; 〈q=log(f(90μm)/f(1.4GHz))〉≈2.2.
• Far-infrared–radio correlation for normal star-forming galaxies and AGNs: 〈q〉〈q〉 lower for AGNs than for normal galaxies: systematic but statistically insignificant difference.
• Far-infrared–radio correlation: the most extreme outliers: AGNs.

We probe radio–infrared correlation for two samples of extragalactic sources from the local Universe from the AKARI All-Sky Catalogue. The first, smaller sample (1053 objects) was constructed by the cross-correlation of the AKARI/FIS All-Sky Survey Bright Source Catalogue, the AKARI IRC All-Sky Survey Point Source Catalogue and the NRAO VLA Sky Survey, i.e. it consists of sources detected in the mid- and far-infrared by AKARI, and at the 1.4 GHz radio frequency by NRAO. The second, larger sample (13,324 objects) was constructed by the cross-correlation of only the AKARI/FIS All-Sky Survey Bright Source Catalogue and the NRAO VLA Sky Survey, i.e. it consists of sources detected in the far-infrared and radio, without a condition to be detected in the mid-infrared. Additionally, all objects in both samples were identified as galaxies in the NED and/or SIMBAD databases, and a part of them is known to host active galactic nuclei (AGNs). For the present analysis, we have restricted our samples only to sources with known redshift z  . In this paper, we analyse the far-infrared–radio correlation for both of these samples. We compare the ratio of infrared and radio emission from normal star-forming dusty galaxies and AGNs in both samples. For the smaller sample we obtained 〈qAGN〉=2.14〈qAGN〉=2.14 for AGNs and 〈qn〉=2.27〈qn〉=2.27 for normal galaxies, while for the larger sample 〈qAGN〉=2.15〈qAGN〉=2.15 for AGNs and 〈qn〉=2.22〈qn〉=2.22 for normal galaxies. An average value of the slope in both samples is 〈q〉~2.2〈q〉~2.2, which is consistent with the previous measurements from the literature.