Long-slit spectroscopy of near-ultraviolet NH absorption in the nuclei of M31

Details Long-slit spectroscopy of near-ultraviolet NH absorption in the nuclei of M31 Long-slit spectroscopy of near-ultraviolet NH absorption in the nuclei of M31

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1143d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1143-1150.

Astronomy and Astrophysics

Astronomy

16

Absorption Spectra, Andromeda Galaxy, Dwarf Stars, Elliptical Galaxies, Galactic Nuclei, Local Group (Astronomy), Abundance, Data Reduction, Diatomic Molecules, Metallicity, Near Ultraviolet Radiation

Scientific paper

Using the Canada-France-Hawaii Telescope long-slit near-ultraviolet spectra of the central regions of M31 and M32 have been obtained. The Delta v = 0 NH absorption bands near 3360 A are detected out to distances of about 32 arcsec in M31 and about 15 arcsec in M32, and the spatial behavior of these features in each galaxy has been studied. NH absorption in M31 appears to vary in a complicated manner with respect to radial distance from the galaxy center, and there is no evidence for a systematic gradient. Moreover, the variations in NH strength appear to be more or less symmetric on a north/south axis about the central nucleus of M31. As for M32, NH absoption becomes progressively stronger with increasing distance from the center of this galaxy. Various explanations for the radial behavior of NH absorption in each galaxy are considered; these results may reflect changes in the relative contributions of early-type stars to the near-ultraviolet light output, or a radial variation in N/Fe.

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