Outskirts of Galaxies by Johan H. Knapen Janice C. Lee & Armando Gil de Paz

Author:Johan H. Knapen, Janice C. Lee & Armando Gil de Paz
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(6.14)

(6.15)

The dust is optically thin at mm/sub-mm wavelengths, and we used , where κ ν and Σ d are the absorption coefficient and surface density of dust. The dust mass within the beam is M d = Σ d D 2 Ω B. Obviously, the dust continuum luminosity depends on the dust properties (e.g. compositions and size distribution; via κ ν ), amount (M d) and temperature (T d).

Equation (6.15) gives the mass-to-light ratio for dust

(6.16)

We convert M d into gas mass, M gas = δ GDR M d, with the gas-to-dust ratio δ GDR. By redefining the dust absorption coefficient κ ν ′ ≡ κ ν ∕δ GDR (the absorption coefficient per unit total mass of gas), the gas mass-to-dust continuum flux ratio γ ν at the frequency ν becomes

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