The ionized gas in the center and in the bar of the spiral galaxy NGC 6946

Details The ionized gas in the center and in the bar of the spiral galaxy NGC 6946 The ionized gas in the center and in the bar of the spiral galaxy NGC 6946

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406...60r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 60-66.

Astronomy and Astrophysics

Astrophysics

13

H Ii Regions, Ionized Gases, Spiral Galaxies, Star Formation, Gas Dynamics, H Beta Line, Oxygen Spectra

Scientific paper

Spectrophotometric data based on narrow-band images at H-alpha, H-beta, forbidden O III 5007 A and forbidden N II 6584 A for 189 H II regions in the spiral galaxy NGC 6946 are presented, with emphasis on the inner regions. The properties of the ionized gas are compared with those of the CO molecular bar. The possible influence of the bar on the ionized interstellar gas and star formation is discussed. The relatively high number of H II regions in the center is consistent with an enhancement of massive star formation as revealed by infrared and molecular observations; the molecular gas bar in NGC 6946 is a favorable environment for massive star formation. The excitation and abundance indicators forbidden O III (5007 + 4959 A)/H-beta and forbidden N II (6584 + 6548 A)/forbidden O III (5007 + 4959 A) show an unusual behavior as a function of galactocentric distances, and their radial trend is consistent with a flattening of the global O/H gradient in the inner regions of NGC 6946. This may be evidence of dilution by low-metallicity gas from outer regions due to strong radial flow along the molecular bar.

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