Properties of H II Regions in the Centers of Nearby Galaxies

Details Properties of H II Regions in the Centers of Nearby Galaxies Properties of H II Regions in the Centers of Nearby Galaxies

1997-04-11

arxiv.org/abs/astro-ph/9704101v1

Astronomy and Astrophysics

Astrophysics

To appear in the Astrophysical Journal. LaTex, 37 pages including 15 postscript figures. AAStex macros included

Scientific paper

10.1086/304642

As part of an optical spectroscopic survey of nearby, bright galaxies, we have identified a sample of over 200 emission-line nuclei having optical spectra resembling those of giant extragalactic H II regions. Such "H II nuclei," powered by young, massive stars, are found in a substantial fraction of nearby galaxies, especially those of late Hubble type. This paper summarizes the observational characteristics of H II nuclei, contrasts the variation of their properties with Hubble type, and compares the nuclear H II regions with those found in galaxy disks. Similarities and differences between H II nuclei and luminous starburst nuclei are additionally noted.

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