Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..235v&link_type=abstract
Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16
Astronomy and Astrophysics
Astronomy
Galactic Structure, H Ii Regions, Interstellar Extinction, Mapping, Radio Astronomy, Star Formation, Electron Density (Concentration), Emission Spectra, Far Infrared Radiation, H Alpha Line, Thermal Emission
Scientific paper
High resoluton, dual frequency radio observations and calibrated H alpha surface photometry of the spiral galaxy M51 are used to determine the physical properties of the 40 brightest HII region complexes. M51 appears to have a normal HII region population when compared with other nearby Sc galaxies for which good data exist. The radio and H alpha data were used to measure the extinction toward the HII regions. The extinction is very patchy but appears to have a weak trend to become on the average smaller toward large galactocentric radii. This trend is consistent with a possible metallicity gradient in M51. The radio determined extinctions were compared with Balmer decrement extinctions and good agreement was found between the two, contrary to previous studies of M51 and other galaxies.
Kennicutt Robert C. Jr.
van der Hulst J. M.
No associations
LandOfFree
The HII regions in M51: Radio and optical observations 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 The HII regions in M51: Radio and optical observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HII regions in M51: Radio and optical observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-859422