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- Conway, John,1963Chalmers tekniska högskola,Chalmers University of Technology (author)
Continuum and Spectral Line Radiation from a Random Clumpy Medium
- Article/chapterEnglish2018
Publisher, publication year, extent ...
- 2018-09-24
- American Astronomical Society,2018
Numbers
- LIBRIS-ID:oai:research.chalmers.se:84602d85-3dfc-466a-9cf2-97233cd36d47
- https://research.chalmers.se/publication/505407URI
- https://research.chalmers.se/publication/506272URI
- https://doi.org/10.3847/1538-4357/aadcf9DOI
- https://research.chalmers.se/publication/505363URI
- https://research.chalmers.se/publication/505553URI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- The American Astronomical Society. All rights reserved. We present a formalism for continuum and line emission from random clumpy media together with its application to problems of current interest, including CO spectral lines from ensembles of clouds and radio emission from H ii regions, supernovae, and star-forming regions. For line emission, we find that the effects of clump opacity on observed line ratios can be indistinguishable from variations of intrinsic line strengths, adding to the difficulties in determining abundances from line observations. Our formalism is applicable to arbitrary distributions of cloud properties, provided the cloud volume filling factor is small; numerical simulations show it to hold up to filling factors of ∼10%. We show that irrespective of the complexity of the cloud ensemble, the radiative effect of clumpiness can be parameterized at each frequency by a single multiplicative correction to the overall optical depth; this multiplier is derived from appropriate averaging over individual cloud properties. Our main finding is that cloud shapes have only a negligible effect on radiation propagation in clumpy media; the results of calculations employing point-like clouds are practically indistinguishable from those for finite-sized clouds with arbitrary geometrical shapes.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- NATURVETENSKAP Fysik Annan fysik hsv//swe
- NATURAL SCIENCES Physical Sciences Other Physics Topics hsv//eng
- H II regions
- ISM: abundances
- radiative transfer
- line: formation
- supernovae: general
- line: profiles
Added entries (persons, corporate bodies, meetings, titles ...)
- Elitzur, MosheUniversity of Kentucky,University of California (author)
- Parra Barraza, Rodrigo,1974European Southern Observatory Santiago(Swepub:cth)rodpar (author)
- Chalmers tekniska högskolaUniversity of Kentucky (creator_code:org_t)
Related titles
- In:Astrophysical Journal: American Astronomical Society865:11538-43570004-637X
Internet link
- https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1608&context=physastron_facpub
- https://research.chalmers.se/publication/505407
- https://research.chalmers.se/publication/506272
- https://doi.org/10.3847/1538-4357/aadcf9
- https://research.chalmers.se/publication/505363
- https://research.chalmers.se/publication/505553
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