Resolved 200mu M images of nearby galaxies - evidence for an extended distribution of cold dust

Details Resolved 200mu M images of nearby galaxies - evidence for an extended distribution of cold dust Resolved 200mu M images of nearby galaxies - evidence for an extended distribution of cold dust

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..807a&link_type=abstract

Astronomy and Astrophysics, v.335, p.807-822 (1998)

Astronomy and Astrophysics

Astrophysics

103

Ism: Dust, Extinction, Galaxies: Ism, Infrared: Galaxies

Scientific paper

We present resolved 200mu m images for 8 nearby galaxies observed with the Infrared Space Observatory (ISO). By comparing the 200mu m observations with IRAS 60mu m and 100mu m data, we find that cold dust becomes more dominant at larger radii. We infer a grain temperature of 18-21 K for this cold component i.e. about 10 K lower than the warm dust detected by IRAS in external spirals. This value is close to theoretical predictions in the literature based on heating by the general interstellar radiation field. A comparison of the 200mu m images with complementary B-band data also shows that the cold dust is radially more extensive than the stars. The gas-to-dust ratio of external spirals, derived using IRAS fluxes, has been claimed to be about an order of magnitude higher than the value infered for the Galaxy. By analysing the 200mu m data for our sample, we derive a mean gas-to-dust ratio of ~ 225 which is close to the value in the solar neighborhood (150-300). It is likely that IRAS may have `overlooked' the vast majority of grains residing in spiral disks. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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