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 (8) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Probable detection of interstellar methylamine-D /CH3NHD/
Fourikis, N.; Takagi, K.; Saito, S.
AA(Commonwealth Scientific and Industrial Research Organization, Div. of Radiophysics, Sydney, Australia), AB(Toyama University, Toyama, Japan), AC(Institute of Molecular Science, Okazaki, Japan)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 212, Feb. 15, 1977, p. L33-L37. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Amines, Deuterium Compounds, Interstellar Matter, Line Spectra, Methyl Compounds, Molecular Spectra, Absorption Spectra, Abundance, Electron Transitions, Galactic Nuclei, Identifying, Molecular Excitation, Radial Velocity
Bibliographic Code:


The letter reports the detection in three sources, including the galactic center, of strong lines tentatively attributed to the 2(02)(+) - 1(10)(-) A-state transition of CH3NHD on the basis of frequency coincidence. Laboratory measurements of the spectra of CH3NH2 and CH3NHD are discussed, and it is noted that the detected molecular lines were observed in absorption toward Sgr A and Sgr B2 but in emission toward Ori A. Velocity widths are derived for the profiles of each source, unsuccessful searches and a marginal detection toward W51 are briefly reviewed, and the excitation of CH3NHD in each source is analyzed. The CH3NHD/CH3NH2 concentration ratio is determined to be between 1 and 30 in the direction of Sgr B2. Two different mean ranges of the D/H concentration ratio in the same direction, including one that lies between the terrestrial and primordial ratios, are obtained by assuming that the very large enrichment of CH3NHD results from a gas-phase chemical reaction or a reaction taking place on interstellar grains.

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