Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1022k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, April 1989, p. 1022-1035, 1256-1258. Research supported by the Research Corp.
Astronomy and Astrophysics
Astrophysics
147
Astrophysics, Galactic Nuclei, H Ii Regions, Spectrophotometry, Spiral Galaxies, Balmer Series, Emission Spectra, Radio Astronomy, Starburst Galaxies, Stellar Spectra
Scientific paper
The physical properties of H II regions situated in galactic nuclei, in regions immediately surrounding the nuclei ('hotspots'), and in the disks are compared, using optical spectrophotometry and radio-continuum data. The integrated properties (size, H-alpha luminosity) of the nuclei and hotspots are similar to those of the brightest disk H II regions, but important differences are found in the emission-line spectra, internal structure, and radio properties. Roughly half of the H II region and starburst nuclei show evidence for a secondary ionization component, either an active nucleus or large-scale shocks. This feature is seen both in the line ratios and line profiles. This supports the idea that many spiral nuclei are composite in nature, with a central LINER or Seyfert-like nucleus surrounded by star-forming regions.
Blaha Cynthia A.
Keel William C.
Kennicutt Robert C. Jr.
No associations
LandOfFree
A comparison of the physical conditions in nuclear, hotspot, and disk H II regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A comparison of the physical conditions in nuclear, hotspot, and disk H II regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A comparison of the physical conditions in nuclear, hotspot, and disk H II regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1735127