Neutral hydrogen absorption within the radio galaxy 3C 178

Details Neutral hydrogen absorption within the radio galaxy 3C 178 Neutral hydrogen absorption within the radio galaxy 3C 178

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..343h&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 343-345. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

13

Absorption Spectra, Hydrogen Clouds, Neutral Gases, Radio Galaxies, Gas Temperature, Hydrogen Atoms, Line Spectra, Microwave Emission, Optical Thickness, Radial Velocity, Red Shift, Spin Temperature

Scientific paper

The detection of neutral hydrogen absorption at 21 cm wavelength arising from within the radio galaxy 3C 178 is reported. The radial velocity of the most prominent absorption feature, 2460 km/s, lies close to the median velocity of the neutral hydrogen emission profile. An estimate of the optical depth (0.06) for this feature leads to a column density for the absorbing material. Three weak features appear at -34, +12, and +40 km/s with respect to the central feature. The effect of the continuum radio source on the spin temperature is discussed.

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