Dust around deeply embedded infrared sources

Details Dust around deeply embedded infrared sources Dust around deeply embedded infrared sources

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..213r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 213-215.

Astronomy and Astrophysics

Astrophysics

22

Infrared Radiation, Interstellar Extinction, Interstellar Matter, Stellar Envelopes, Cosmic Dust, Millimeter Waves, Molecular Clouds, Plancks Constant, Submillimeter Waves

Scientific paper

Using existing data in literature, an attempt is made to relate τ9.7, the silicate absorption optical depth to τ400 and τ1000 the 400 μm and 1 millimetre emission optical depths of deeply embedded infrared sources. It is found that the mean values of τ9.7/τ400 and τ9.7/τ1000 are 110 and 380 respectively. These ratios are in good agreement with expectations based on the laboratory measurements for amorphous silicate grains with icy mantles. The relationship between the hydrogen column density and τ400 implied by the derived ratio is N(H) = 6.8×1024τ400 atoms cm-2 with an uncertainty of about ±60%.

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