On the [S II] and [O I] Line Intensities in Gaseous Nebulae and Nuclei of Galaxies

Details On the [S II] and [O I] Line Intensities in Gaseous Nebulae and Nuclei of Galaxies On the [S II] and [O I] Line Intensities in Gaseous Nebulae and Nuclei of Galaxies

Dec 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971bott....6...97p&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 6, pp. 97-100 (1971) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

13

Galaxies: Nuclei, Galaxies: Individual (M51, M81, Ngc 4151), Hii Regions: Individual (Orion), Planetary Nebulae: Individual (Ngc 7009)

Scientific paper

We present new photoelectric observations of the [S II] line intensities in the nuclei of M51 and M81. It is shown that the [S II]/[O I] line intensity ratios are very similar in objects where the [O I]/[O III] line intensity ratios differ by as much as three orders of magnitude; these objects comprise normal H II regions, nuclei of galaxies and a supernova remnant. This result strongly suggests that the [O I] and [S II] lines originate in the same regions. It is shown that in the regions where the [O I] and [S II] lines originate a considerable fraction of the oxygen is ionized.

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