Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195...38v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 38-52.
Astronomy and Astrophysics
Astronomy
125
Balmer Series, H Alpha Line, H Ii Regions, Radio Astronomy, Spiral Galaxies, H I Regions, Very Large Array (Vla)
Scientific paper
This paper uses new 6 and 20 cm radio images at 8arcsec resolution, Hα surface photometry and 9arcsec-aperture optical spectrophotometry of M51 to study the properties of the H II regions, the luminosity function of the H II regions, and the extinctions toward the H II regions. The physical properties of the H II regions studied are in the range of those of the so-called giant extragalactic H II regions with densities and sizes of a few cm-3 and a few hundred parsecs, respectively. Extinctions range from 1 to 4 mag. Detailed comparisons of Balmer-decrement extinctions with the radio - Hα extinctions for 11 H II regions show that the Balmer-decrement extinctions are smaller by less than 0.6 mag, relieving the requirements for large amounts of uniform, internal dust in the H II regions. The observed differences can be explained by the presence of small scale structure in the dust surrounding the H II or opaque clumps in the H II regions, or both.
Crane Patrick C.
Kennicutt Robert C.
Rots Arnold H.
van der Hulst J. M.
No associations
LandOfFree
Radio properties and extinction of the H II regions in M51 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 Radio properties and extinction of the H II regions in M51, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio properties and extinction of the H II regions in M51 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-847412