Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (253) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (19)
· NED Objects (6)
· Also-Read Articles (Reads History)
· Translate This Page
Far-infrared spectroscopy of galaxies - The 158 micron C(+) line and the energy balance of molecular clouds
Crawford, M. K.; Genzel, R.; Townes, C. H.; Watson, D. M.
AA(California, University, Berkeley, CA), AB(California, University, Berkeley, CA), AC(California, University, Berkeley, CA), AD(California Institute of Technology, Pasadena, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 15, 1985, p. 755-771. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Abundance, Galactic Nuclei, Infrared Spectroscopy, Interstellar Matter, Line Spectra, Molecular Clouds, Carbon, Carbon Monoxide, Emission Spectra, Energy Budgets, Far Infrared Radiation, Hydrogen Clouds, Ionized Gases, Radiant Flux Density, Ultraviolet Radiation
Bibliographic Code:


Observations of the 158 microns fine-structure line of C(+) toward the nuclei of six gas-rich galaxies are presented. The observations are compared with observations of the CO J = 1-0 and H I 21 cm lines, observations of far-IR continuum emission, and observations of forbidden C II emission with the Galaxy. The forbidden C II line comes from dense, warm gas in UV-illuminated photodissociation regions at the surfaces of molecular clouds. This line is probably optically thin in all but the brightest of galactic sources. The variation of forbidden C II brightness from source to source and its ratio to the integrated infrared continuum intensity agree well with the theoretical prediction that UV absorption by dust controls the C(+) column density. The forbidden C II line is a tracer of molecular clouds, especially those near intense sources of UV radiation.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints