AN INTERSTELLAR CONTRIBUTION OF Na i D FROM THE ARM OF M 51 TOWARD THE NUCLEUS OF NGC 5195

We report on evidence for interstellar absorption due to the foreground spiral arm of NGC 5194 (M 51) in the spectrum of the nucleus of NGC 5195. The presence of such absorption was hinted at by Spinrad (1973) but not confirmed. The Na i D lines in the spectrum are anomalously strong and might be ac...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1987-06, Vol.99 (616), p.467-470
Main Author: VAN DYK, SCHUYLER D.
Format: Article
Language:English
Subjects:
D lines
Emission spectra
Galaxies
Line spectra
Milky Way Galaxy
Observational research
Radial velocity
Stellar populations
Stellar spectra
Stellar spectral lines
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Summary:We report on evidence for interstellar absorption due to the foreground spiral arm of NGC 5194 (M 51) in the spectrum of the nucleus of NGC 5195. The presence of such absorption was hinted at by Spinrad (1973) but not confirmed. The Na i D lines in the spectrum are anomalously strong and might be accounted for by interstellar dust in the arm projected against the nucleus of NGC 5195.
ISSN:0004-6280
1538-3873
DOI:10.1086/132006