The plane W(Na I) X W(Mg I) - Effects of interstellar Na I in a sample of southern galaxies

Details The plane W(Na I) X W(Mg I) - Effects of interstellar Na I in a sample of southern galaxies The plane W(Na I) X W(Mg I) - Effects of interstellar Na I in a sample of southern galaxies

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1702b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1702-1714. Research supported by CNPq of Brazil.

Astronomy and Astrophysics

Astronomy

20

Galactic Radiation, Interstellar Matter, Line Spectra, Metallicity, Sodium, Southern Sky, Galactic Bulge, Interstellar Gas, Red Shift, Sky Surveys (Astronomy), Spiral Galaxies

Scientific paper

Galaxy spectra from a subsample of the Southern Sky Redshift Survey data bank were used to study the equivalent width plane for the lines Na I lambda 5893 A vs Mg I lambda 5175 A. An estimate of how important the contribution of the interstellar gas for the sodium line is compared to that of the stellar population. The sample is made up of galaxies with morphological types from E to Sc and are distributed up to radial velocities of 25,000 km/s, most of them smaller than 15,000 km/s. Most early type galaxies with dust lanes, particularly nearly edge-on So's, present an enhancement of the Na I line. Inclined spiral galaxies tend to present enhanced Na I with respect to face-on spirals. This tendency, previously found in a smaller sample of galaxies limited to V equal to or less than 6000 km/s, is now confirmed for more distant ones. In the large velocity sample it shows the global bulge rather than the very nucleus; the persistence of the effect suggests that the scale height of the gas layer in the central disk can reach a considerable fraction of the bulge radius.

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