Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54..273l&link_type=abstract
Astronomicheskii Zhurnal, vol. 54, Mar.-Apr. 1977, p. 273-284. In Russian.
Astronomy and Astrophysics
Astronomy
1
Brightness Temperature, Centimeter Waves, Galactic Radio Waves, Isophotes, Radio Astronomy, Radio Galaxies, Galactic Structure, H Ii Regions, Hot Stars, Interstellar Matter, Radio Telescopes, Tables (Data)
Scientific paper
Results are presented for 7700-MHz radio observations of the Galactic disk between longitudes of zero and 45 deg. Isophotes of the disk radio-brightness distribution are plotted which show that the emission originates from a narrow layer extending along the Galactic equator, with the maximum emission arising in the region less than 7 kpc from the Galactic center. A small-scale cloud structure is observed whose longitudinal distribution is similar to that of ionized gas in the disk but significantly different from that of bright H II regions. Discrete large-scale cloud complexes are also detected, and their centimeter emission is found to be thermal in nature. It is shown that the large-scale complexes at three longitudes are greatly extended in the direction perpendicular to the Galactic plane and are correlated with the molecular-gas abundance as well as with the distribution of hot OB stars. It is suggested that the large-scale complexes may be ionized by runaway OB stars.
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