Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..192k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 192-206.
Astronomy and Astrophysics
Astronomy
17
Galactic Structure, H Ii Regions, H Lines, Quasars, Radio Sources (Astronomy), Absorption Spectra, Brightness Distribution, Emission Spectra, H I Regions, Milky Way Galaxy
Scientific paper
21 cm atomic hydrogen emission-absorption experiments have been conducted toward 19 Galactic H II regions lying within 1 deg of the Galactic plane. With the exception of one source, absorption has been detected at the hydrogen recombination line velocity of each H II region. 141 absorption features at positive LSR velocities have been identified. If the observed absorption is solely due to cold gas attenuating thermal continuum, these data can provide kinematic distance estimates for the H II regions. Approximately 40 percent of the absorption features are correlated with (C-13)O emission. Nearly 17 percent of the (C-13)O lines appear not to be associated with H I absorption. The derived spin temperatures for these features range from 25 to about 350 K. The measured optical depths are strongly correlated with the spin temperatures.
Bania Thomas M.
Kuchar Thomas A.
No associations
LandOfFree
H I emission-absorption experiments toward Galactic 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 H I emission-absorption experiments toward Galactic H II regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H I emission-absorption experiments toward Galactic H II regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1886200