Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305l..35r&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 305, June 15, 1986, p. L35-L37.
Astronomy and Astrophysics
Astrophysics
23
Absorption Spectra, Galactic Nuclei, H Alpha Line, Spiral Galaxies, Astronomical Spectroscopy, Disk Galaxies, Hydrogen Clouds, Line Of Sight
Scientific paper
Spectra of the inner 1.77 arcsec (radial distance less than 4 pc) of M33 are unique in showing H-alpha in deep sharp absorption and forbidden N II 6548 and 6583 in emission. Just beyond the nucleus, strong disk H-alpha and forbidden N II emission are present. Hence if M33 were located at a distance several times as great, a spectrum through the 1.77 arcsec aperture would show H-alpha and forbidden N II in emission, as the contamination from the disk emission overwhelms the nuclear H-alpha absorption. For galaxies at greater distances, the measured forbidden N II/H-alpha ratio in the central region is a complex function of nuclear and disk light which enters the aperture.
Ford Kent Jr. W.
Rubin Vera Cooper
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