Nuclei and H2 regions in spiral galaxies: Preliminary results for M 101

Details Nuclei and H2 regions in spiral galaxies: Preliminary results for M 101 Nuclei and H2 regions in spiral galaxies: Preliminary results for M 101

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974hrgc.conf..145b&link_type=abstract

H II regions and the galactic centre : proceedings of the Eighth ESLAB Symposium, 4-7 June 1974, Frascati, Italy, p. 145-150 (SE

Physics

Emission Spectra, Galactic Nuclei, Hydrogen Clouds, Spiral Galaxies, Brightness, Galactic Structure

Scientific paper

The relative intensities of the emission lines H alpha, lambda 6584 of (NII), lambda-lambda 6717,6731 of (S2) for the nucleus, and 10 H2 regions of M101 are given. From the (S2) lines ratio, it was found that Ne=3000/cu cm in the nucleus, while Ne is less than 1000/cu cm in the H2 regions. The presence of a peculiar structure in the nucleus is revealed. Physical conditions and N/S abundance ratio in the H2 regions are very close to those obtained for M33. An upper limit for the surface brightness of the interarm area of M101 was established.

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