NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T08:21:51 PDT
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For refcode 2000ApJ...543..153T:
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Copyright by American Astronomical Society. Reproduced by permission
2000ApJ...543..153T ISO Long Wavelength Spectrograph Observations of Cold Dust in Galaxies Matthew Trewhella IPAC (Caltech/JPL), 770 S. Wilson Avenue, Pasadena, CA 91125 Jonathon I. Davies, Paul B. Alton, and Simone Bianchi Department of Physics and Astronomy, University of Wales Cardiff, The Parade, Cardiff CF2 3YB, UK and Barry F. Madore NASA/IPAC Extragalactic Database (NED), 770 S. Wilson Avenue, Pasadena, CA 911252 Received 1999 December 9; accepted 2000 April 5 ABSTRACT We describe observations of five nearby galaxies obtained using the Long Wavelength Spectrograph (LWS) on the Infrared Space Observatory (ISO). We observed five galaxies, using spectrograph apertures positioned at the galactic center and in the outskirts of the disk, to compare the spectral energy distribution of the emitting dust at different positions. The central spectra are typical of those inferred previously from IRAS data; peaking at about 100 microns with estimated dust temperatures of T_d_ = 30- 35 K. However, there is a rapid change in the spectral energy distribution with increasing galactocentric distance. In the outer regions the spectra are flat, or still rising, out to 197microns, indicating a predominantly cold dust component with T_d_ < 20 K. In the central regions, the inferred cold dust component is 2-10 times more massive than the warm dust, and it increasingly dominates the mass and spectral energy distribution in the outer regions. We discuss reasons for believing that emission beyond ~150 [μ]m in disk galaxies is associated with a separate component of dust with an extended distribution that may be associated with a possible molecular halo. Subject headings: dust, extinction-galaxies: halos-galaxies: ISM-infrared: galaxies
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