Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..223b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. 223-233.
Astronomy and Astrophysics
Astrophysics
8
Galactic Evolution, Galactic Structure, Interstellar Gas, Spectrum Analysis, Star Formation, Absorption Spectra, Continuous Spectra, Forbidden Transitions, H Alpha Line, Nitrogen
Scientific paper
A spectral analysis in the visible of 55 early type galaxies also observed in the 21 cm line allows the investigation of the possible relationship between star formation and the H I content. No significant correlation is found between the H I content and various parameters like the stellar population, the presence of an H-beta absorption component, the H-alpha and N II forbidden line emission line intensity, the absolut e luminosity, the IRAS infrared flux, the X-ray emission, or the radio continuum flux. However, the relationship between the luminosity and the (forbidden N II)/(H-alpha) line intensity ratio is not confirmed. The absence of clear correlations reflects the complexity of the situation. It may suggest also that lenticular galaxies do not form an homogeneous class of objects.
Alloin Danielle
Balkowski Ch.
Le Denmat Gerard
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