Cold dust emission from spiral arms of M 51.

Details Cold dust emission from spiral arms of M 51. Cold dust emission from spiral arms of M 51.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298l..29g&link_type=abstract

Astronomy and Astrophysics, v.298, p.L29

Astronomy and Astrophysics

Astrophysics

47

Galaxies: M 51, Interstellar: Dust, Molecules

Scientific paper

Using the IRAM 30m telescope equipped with the MPIfR 7-channel bolometer array, we have mapped the λ 1.2mm continuum emission of the inner part of M 51. This emission traces the central molecular disk and the inner spiral arms and correlates remarkably well with the ^12^CO (2-1) line emission. The λ 1.2mm continuum to CO line intensity ratio, averaged over the 70 GHz-wide bolometer band, is 7; a similar value was derived for NGC 891. The λ 1.2mm emission arises mostly from cold dust (T_d_<20K) associated with molecular clouds. Using the local Galactic value of the dust absorption cross section, corrected for the larger metallicity observed near M 51's center, we derive the gas distribution from this emission. The derived molecular masses are ~4 times smaller than those obtained from the CO luminosity, using Strong et al.'s Galactic CO to H2 conversion factor, but close to the masses estimated from ^13^CO and from visual extinction.

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