Cold dust in galaxies.

Computer Science

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Spiral Galaxies: Dust, Markarian Galaxies: Dust, Active Galaxies: Dust

Scientific paper

The activity of galaxies reaches from the enhanced star-formation rate to the outburst of quasars. These different aspects of converting cold gas into luminosity can be well described by the ratio of infrared luminosity versus gas mass. The process of star formation is characterised by LIR/Mgas values of 5 [Lsun/Msun] in normal spirals and 100 in active Mkn galaxies while quasars attain values above 500 due to additional non-thermal processes. Moreover, the coldest dust component in extragalactic objects also seems to be correlated with the stage of activity. New ISOPHOT data between 60 and 200 μm and SEST data at 1300 μm corroborate these results for active galaxies but indicate the presence of very cold dust (≍10 K) in normal spirals. The implications on the total gas content of galaxies are discussed.

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