Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...301..853g&link_type=abstract
Astronomy and Astrophysics, v.301, p.853
Astronomy and Astrophysics
Astrophysics
34
Interstellar Medium: Clouds, General, Radio Continuum, Ism, Infrared: Ism, Continuum
Scientific paper
This article discusses thermal emission from interstellar dust as a quantitative probe of gas in star-forming regions, with particular emphasis on the interpretation of observations made at millimeter and submillimeter wavelengths. Expressions relating dust opacity to the column density of hydrogen are derived. Examination of the uncertainties associated with the observations and with intepretation shows that beam-averaged hydrogen column densities in these regions can be determined within factors of 5-20. The largest source of uncertainty lies in the conversion of derived dust opacities into gas column densities. Within the wavelength range 100<λ<3000μm, we suggest the relationship N(H)/τ_dust_=~1.1x10^20lambda^2.0^cm^-2^ for dense dust clouds until the nature of the dust grains within these clouds becomes better known.
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