Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..239c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 239-246. Research supported by CONICET.
Astronomy and Astrophysics
Astronomy
16
H Alpha Line, Milky Way Galaxy, Sky Surveys (Astronomy), Southern Sky, Abundance, Brightness Temperature, Emission Spectra, Gas Density, Ionized Gases, Velocity Distribution
Scientific paper
A survey of low density ionized hydrogen has been completed along the southern part of the galactic plane. The longitude and radial distribution of the ionized material differs slightly from that seen in northern surveys. Ionized hydrogen in the south is relatively more abundant for galactocentric radii 6kpc, than in the north. That is, the mass of ionized hydrogen is slightly larger in the fourth than in the first quadrant of the galaxy. By comparing the terminal velocities of H166 alpha and the H I line emission, it is found that ionized low density gas is located at the subcentral points only at longitudes greater than 30 deg. In both quadrants the amount of ionized gas decreases toward the inner region at 4 kpc from the galactic center. The H166 alpha originates in relatively hot, fully-ionized gas, rather than in partially ionized, cooler gas.
Azcarate I. N.
Cersosimo Juan Carlos
Colomb Fernando R.
Hart L.
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