Imaging spectroscopy of a spiral arm of the galaxy NGC 1566

Details Imaging spectroscopy of a spiral arm of the galaxy NGC 1566 Imaging spectroscopy of a spiral arm of the galaxy NGC 1566

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223...39r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Nov. 1, 1986, p. 39-56.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Hydrogen Clouds, Imaging Spectrometers, Metallicity, Spiral Galaxies, Astronomical Photography, Barred Galaxies, Interstellar Extinction, Line Spectra

Scientific paper

Spectra for the northwestern arm of the spiral galaxy NGC 1566 are presented. Extinction and line-ratio maps which were calculated from the spectra are analyzed. The behavior of various line ratios along the length of the spiral arm, and the relationship between N II/O II, and S II/O II forbidden line ratios and the metal-abundance index forbidden O II + O III/H-beta are studied. It is observed that the extinction map does not show any systematic behavior and reddening is about 2.0 + or - 0.3 mag. The data reveal that there are spatial variations of about 100 pc in the metal-abundance index forbidden O II + O III/H-beta and the variations are due to such factors as varying the effective temperature of the exciting stars and changing the ionization parameters.

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