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 (93) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
CO isotope studies and mass of the Sagittarius B2 molecular cloud
Authors:
Lis, Dariusz C.; Goldsmith, Paul F.
Affiliation:
AA(Five College Radio Astronomy Observatory, Amherst, MA), AB(Five College Radio Astronomy Observatory, Amherst, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 704-711. (ApJ Homepage)
Publication Date:
02/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Carbon Monoxide, H Ii Regions, Molecular Clouds, Abundance, Density Distribution, Mass Distribution, Sagittarius Constellation, Signal To Noise Ratios, Spectral Line Width
DOI:
10.1086/167141
Bibliographic Code:
1989ApJ...337..704L

Abstract

(C-13)O and (C-18)O observations of the central region of Sagittarius B2 are presented. A (C-13)O to (C-18)O abundance ratio of 9.0 + or - 1.9, consistent with the average ratio in the disk and other Galactic center sources, is obtained. Comparison of the (C-13)O column density based on the present data with H2 column density based on 1300 micron continuum data gives an upper limit of 10 to the -6th for the (C-13)O fractional abundance, a factor of two lower than the local value. The (C-12)O/H2 abundance ratio is a factor of six lower than the local value due to the lower (C-12)O to (C-13)O ratio. It is concluded that abundances of many molecular species in addition to the CO isotopes may be lower than in local clouds. The observations suggest a two-component structure for the cloud, with a constant density component and a component with density having a power-law dependence on the distance from cloud center. Values for the outer radius, total mass, and virial mass of the cloud are derived.

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