Spectrophotometry of H II regions and the nucleus of NGC 1566

Details Spectrophotometry of H II regions and the nucleus of NGC 1566 Spectrophotometry of H II regions and the nucleus of NGC 1566

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..783h&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 783-785, 787-792.

Astronomy and Astrophysics

Astrophysics

40

Galactic Nuclei, Galactic Structure, H Ii Regions, H Lines, Seyfert Galaxies, Spiral Galaxies, Abundance, Emission Spectra, Luminosity, Spectrophotometers

Scientific paper

The paper presents spectrophotometric observations of the nucleus and nine H II regions in the spiral arms of the Sbc galaxy NGC 1566. The emission line spectra of the H II regions are characterized by a low grade of ionization, and most of the line intensities do not show radial gradients; the N II/O II forbidden line ratio appears to increase toward the nucleus, and the forbidden O III/H-beta ratio may decrease in the same direction. This is explained by the increase of the oxygen abundance and decrease of the electron temperature toward the nucleus; the spectra confirm the presence of the weak, broad emission wings at H-alpha, and the nuclear spectrum of NGC 1566 resembles that of a giant H II region rather than that of a Seyfert galaxy.

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