NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T05:40:29 PDT
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For refcode 1995A&A...295..317C:
Retrieve 32 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&A...295..317C Dust in spiral galaxies. II. R. Chini, E. Krugel, R. Lemke, and D. Ward-Thompson Max-Planck-Institut fur Radioastronomie, Auf dem HUge1 69, D-53121 Bonn, Germany Royal Observatory Edinburgh, Blackford Hill, Edinburgh. EH9 3HJ, Scotland Received 21 March 19941 Accepted 3 September 1994 Abstract. We have mapped 32 non-active spirals at 1300 microns and measured 7 of them at 450 and 800 microns. We determine gas masses, dust temperatures and IR luminosities. From a detailed analysis we find: i) The spatial extent of the cold dust is comparable to the optical size of the galaxies. About 70% of the mass is contained within half the optical radius; there the gas surface density decreases inversely proportional to the galactocentric radius. ii) The new submm data set limits on the decomposition of the FIR spectra into dust components of different temperatures. The flux ratios of 450 to 1300 microns suggest two kinds of non-active spirals: those with S_450 microns_/S_1300 microns_~ 40, like the Milky Way, where the coldest dust is ~20K and accounts for most of the emission between 100 and 1300 microns; on the other hand, there are galaxies with S_450 microns_/S_1300 microns_ ~ 20 which implies that most of the interstellar dust is extremely cold (~10K). iii) The ratio of infrared luminosity to gas mass, L_IR_/M_gas_ equals 512 in solar units. For active galaxies from the Markarian catalog this ratio is 20 times larger. Therefore L_IR_/M_gas_ gives a clear signature for the activity stage. Key words: galaxies: ISM - galaxies: spiral - dust - radio continuum: galaxies
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