Infrared emission from dust in shocked gas
Journal Article
·
· Astrophys. J.; (United States)
The cooling effects of dust in shock-heated gas, and the resulting infrared emission spectra, are computed for a realistic two-component (silicate and carbon) model for interstellar dust with the power-law size distribution proposed by Mathis, Rumpl, and Nordsieck. The infrared and far-infrared opacity of this grain model is discussed, and Planck-averaged emissivities are evaluated for both grain constituents. Thermally averaged accommodation coefficients for electrons and ions are obtained. Grain destruction is included in the calculations. Dust is an important coolant for shock speeds v/sub s/> or approx. =200 km s/sup -1/, radiating up to approx.17% of the shock energy in the infrared. Supernova-driven shock waves in our Galaxy with v/sub s/> or approx. =200 km s/sup -1/ advancing into clouds with preshock density n/sub H/ /sup 0/> or approx. =10/sup 2/ cm/sup -3/ should be detectable with current infrared instrumentation; for n/sub H/ /sup 0/> or approx. =10/sup 3/ cm/sup -3/ the 9.7 ..mu..m and 18 ..mu..m silicate emission features are predicted to be prominent.
- Research Organization:
- Institute for Advanced Study
- OSTI ID:
- 6116691
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 245:3; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
COOLING
COSMIC DUST
COSMIC GASES
COSMIC RADIO SOURCES
DUSTS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
EMISSIVITY
FAR INFRARED RADIATION
FLUIDS
GASES
HEATING
INFRARED RADIATION
INFRARED SPECTRA
INTERSTELLAR GRAINS
NEBULAE
NONMETALS
OPACITY
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
RADIATIONS
RADIATIVE COOLING
SHOCK WAVES
SILICATES
SILICON COMPOUNDS
SPECTRA
SUPERNOVA REMNANTS
SURFACE PROPERTIES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
COOLING
COSMIC DUST
COSMIC GASES
COSMIC RADIO SOURCES
DUSTS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
EMISSIVITY
FAR INFRARED RADIATION
FLUIDS
GASES
HEATING
INFRARED RADIATION
INFRARED SPECTRA
INTERSTELLAR GRAINS
NEBULAE
NONMETALS
OPACITY
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
RADIATIONS
RADIATIVE COOLING
SHOCK WAVES
SILICATES
SILICON COMPOUNDS
SPECTRA
SUPERNOVA REMNANTS
SURFACE PROPERTIES