Cool-FIR/radio correlation for late-type galaxies - The case for Supernova progenitors

Details Cool-FIR/radio correlation for late-type galaxies - The case for Supernova progenitors Cool-FIR/radio correlation for late-type galaxies - The case for Supernova progenitors

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285...19x&link_type=abstract

Astronomy and Astrophysics 285, 19-26 (1994)

Astronomy and Astrophysics

Astrophysics

21

Galaxies, Radio Continuum, Far-Infrared, Star Formation, Stars:Supernovae

Scientific paper

We have studied the correlation between the cool ('cirrus') component of the far-infrared (FIR) luminosities and the radio intensities of normal late type galaxies (later than S0/a). Our method is using available Hα data to estimate the warm component. Then the cool component is the difference between the total FIR and the warm component. A very tight correlation has been found between the logarithms of the cool-FIR luminosities and the logarithms of the intensities of the radio continuum at 20cm for a sample of 65 galaxies, with a linear correlation coefficient of 0.94 and a dispersion of only 0.21. The correlation is even stronger than the warm-FIR/radio correlation which has a linear correlation coefficient of 0.89 and a dispersion of 0.32 for the same sample of galaxies. Our interpretation is that the cool-FIR is tightly related to intermediate massive stars, i.e. supernova progenitors. When the radio continuum intensity is also decomposed, into the thermal and nonthermal components, it is found that the cool-FIR emission correlates strongly with the nonthermal radio component. We propose that the FIR/radio correlation can be separated into two relations which are more fundamental, namely the warm-FIR/thermal-radio correlation which is due to massive ionizing stars (> 20Msun_) and the cool-FIR/nonthermal-radio correlation due to intermediate massive stars (5-20Msun_).

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