NGC 3344 - Unusual abundances for an SBC galaxy

Details NGC 3344 - Unusual abundances for an SBC galaxy NGC 3344 - Unusual abundances for an SBC galaxy

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..273m&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, June-July 1981, p. 273-278.

Mathematics

Logic

4

Abundance, Emission Spectra, Interstellar Gas, Line Spectra, Spiral Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Cosmic Dust, H Beta Line, H Ii Regions, Ionized Gases, Oxygen, Spectral Line Width

Scientific paper

Spectrophotometry of H II regions in the Sbc galaxy NGC 3344 reveals that it has a strong radial excitation gradient, with the ratio of the log of forbidden O III to H-beta rising to +0.7 in the outermost arms. Such behavior has heretofore been observed only in Scd galaxies, and it contrasts with observations of a number of galaxies of type Sc or earlier. (The colors and gas fraction of NGC 3344 are typical for its morphological type.) If this galaxy follows the relationship between abundance and excitation that is observed in other galaxies, then it has a strong abundance gradient in which the O/H abundance ratio falls to -0.7 in the outermost arms. Alternatively, the H II regions in NGC 3344 may have normal abundances together with unusually hot ionizing stars or a low dust/gas ratio.

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