NGC 315 - High-velocity H I in an active elliptical galaxy

Details NGC 315 - High-velocity H I in an active elliptical galaxy NGC 315 - High-velocity H I in an active elliptical galaxy

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266l..97d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 266, Mar. 15, 1983, p. L97-L101.

Astronomy and Astrophysics

Astrophysics

13

Absorption Spectra, Active Galaxies, Elliptical Galaxies, H Lines, Hydrogen Clouds, Radial Velocity, Radio Galaxies, Centimeter Waves, Galactic Nuclei, Radio Spectra, Spectral Line Width

Scientific paper

The detection of high-velocity H I in absorption against the nuclear continuum source in the giant elliptical galaxy NGC 315 is reported. The absorption line is found to be highly blueshifted in the reference frame of the galaxy with a projected velocity toward the galaxy of 490 km/s. The absorption line is very strong (244 + or - 4 mJy), consisting of two components with very narrow velocity widths of 2.5 km/s (FWHM) each and peak optical depths of 0.9 and 0.2. The kinetic temperature must be 150 K if the line widths are due entirely to thermal broadening, while the neutral gas column densities implied are 2-5 x 10 to the 20th hydrogen atoms/sq cm. No OH in absorption was detected in these clouds to a limiting peak optical depth of 0.04, although this result is consistent with either a galactic or extragalactic origin of the clouds. It is suggested that these clouds may have condensed out of a large unobserved galactic halo of gas, or they may reside in or have been captured from the intracluster medium.

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