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 (59) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (17)
· Also-Read Articles (Reads History)
· Translate This Page
A survey of N2H(+) in dense clouds - Implications for interstellar nitrogen and ion-molecule chemistry
Womack, M.; Ziurys, L. M.; Wyckoff, S.
AA(Arizona State University, Tempe, AZ), AB(Arizona State University, Tempe, AZ), AC(Arizona State University, Tempe, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 417-429. Research supported by Arizona State University. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Azo Compounds, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Dark Matter, Electron Transitions, Emission Spectra, Formyl Ions, Molecular Rotation, Spectral Line Width
Bibliographic Code:


Attention is given to spectra of the N2(H(+) J = 1 - 0, J = 3 - 2 and (N-15)NH(+) and N(N-15)H(+) J = 1 - 0 rotational transitions obtained toward a sample of star-forming and cold dark clouds in the Galaxy. Toward the star-forming regions, line profiles are relatively narrow (typically 1-5 km/s) and show no evidence of line wings, in contrast to the spectra of HCO(+). It is inferred from the apparent absence of N2H(+) in hot, shocked gas that this ion may be a selective tracer of extended, quiescent material. Column densities of N2H(+) were found to be about 5 x 10 exp 12/sq cm toward cold clouds and about 10 exp 14/sq cm toward warm clouds. These values correspond to fractional abundances, relative to H2, of about 4 x 10 exp -10 toward both the warm and cold clouds. It is concluded that the abundance and distribution of N2H(+) is well explained by the ion-molecule chemistry, provided it has reached the steady state, as is found for interstellar NH3. The N2H(+) results are advanced as further evidence that interstellar nitrogen chemistry is anomalous.

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