Spatial Distribution of Ionized Gas in Bright Barred Spiral Galaxies: H(alpha) Images

Details Spatial Distribution of Ionized Gas in Bright Barred Spiral Galaxies: H(alpha) Images Spatial Distribution of Ionized Gas in Bright Barred Spiral Galaxies: H(alpha) Images

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rmxaa..32...89g&link_type=abstract

UNAM: Mexican Review of Astronomy and Astrophysics, vol. Volume 32, p. 89-130

Astronomy and Astrophysics

Astrophysics

32

Spatial Distribution, Ionized Gases, Barred Galaxies, Spiral Galaxies, Image Analysis, Charge Coupled Devices, Star Formation, Dust, Temperature Ratio, Cosmic Gases, Disk Galaxies

Scientific paper

Charged Coupled Detector (CCD) images of a set of 52 bright barred spiral galaxies in the narrow band filter H(alpha) and in the broadband I filter are presented. The sample was selected from the Shapley Ames Catalog, with IRAS fluxes characteristic of star formation and a dust temperature above Td greater than or equal to 25 K. The study is aimed at identifying the global distribution and the underlying symmetries of the structures of ionized gas in barred galaxies. Thirty-two galaxies present H(alpha) emission from the innermost central regions, but the emission from nuclear rings is observed only in ten galaxies. About half of the observed galaxies show H(alpha) emission from several regions in the disk, and 18 galaxies display emission from along the bar. The H(alpha) emission from inner and outer rings are easily identified in some galaxies. Some other galaxies present more complicated spatial distributions, probably due to tidal or direct encounters with neighboring galaxies.

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