Detection of H II regions and ionized interarm gas in the Sombrero Galaxy /NGC 4594/

Details Detection of H II regions and ionized interarm gas in the Sombrero Galaxy /NGC 4594/ Detection of H II regions and ionized interarm gas in the Sombrero Galaxy /NGC 4594/

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220...98s&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 98-106.

Astronomy and Astrophysics

Astrophysics

41

Galactic Structure, H Ii Regions, H Lines, Interstellar Gas, Ionized Gases, Spiral Galaxies, Early Stars, Nebulae, Radial Velocity, Spectroscopy, Stellar Evolution

Scientific paper

Spectroscopic observations of NGC 4594 unambiguously show the presence of H II regions and ionized interarm gas in that galaxy. The brightest H II regions appear to be excited by early O-type stars, giving evidence for the formation of high-mass stars. Ionized gas of low density pervades the visible disk of the galaxy and apparently corotates with the stars. The unusually high rotational velocities reveal a very massive galaxy. When combined with available photometric data, these velocities also indicate a large radial increase of the mass-to-light ratio similar to that observed in M31.

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