Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.199..199p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 199, no. 2, p. 199-213.
Astronomy and Astrophysics
Astronomy
Markarian Galaxies, Star Formation, Cosmic Dust, Emission Spectra, Galactic Nuclei, Infrared Astronomy Satellite, Spectral Bands, Star Formation Rate
Scientific paper
The IR emission of 640 Markarian galaxies (MrkG), included in the IRAS Survey, is considered as an evidence for enhanced star formation rate (SFR) in these objects. About 73 percent of the MrkG have high far-infrared luminosities in l-500 mcm IR spectral band. The distribution of log(f60/f100), peaked at about 45 K, shows that IRAS MrkGs have a tendency to extend the relation f60/f100 vs L(ir)/L(bi) for 'normal' S galaxies. They emit up to 100 times more IR energy in 40-120 mcm band than in optics. The mean ratio log (L(ir)/L(b)) for 621 IRAS MrkG with known redshifts is 2.2. It is suggested that there are two IR-emitting components in the IRAS MrkG: a warm one connected with the UV-fluxes of the newborn massive stars, reradiated by dust, and a cool one, originated from the dust in galactic disks and heated by the general interstellar radiation field. The mean warm IR fraction for all Mrk IRAS detected galaxies with well-defined IR fluxes is 0.83. The dust mass responsible for the IR flux at 60 mcm is derived to be about 10E + 5 solar masses. There is a relation between L(ir) and L(bl) which points out that the most IRAS MrkG have rather enhanced SFR.
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