Interstellar absorption lines in the directions of extragalactic objects. I

Details Interstellar absorption lines in the directions of extragalactic objects. I Interstellar absorption lines in the directions of extragalactic objects. I

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..317b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, July 1983, p. 317-329.

Astronomy and Astrophysics

Astronomy

34

Interstellar Gas, Interstellar Radiation, Milky Way Galaxy, Absorption Spectra, Calcium, Data Reduction, Iue, Magellanic Clouds, Radial Velocity, Sodium, Visible Spectrum

Scientific paper

Observations are presented of Na I and Ca II interstellar lines with resolutions as fine as 24 and 17 km/s respectively, obtained in the directions of the extragalactic sources NGC 985, 1068, 3C 273, 1916-588, and Mkn 509. It is found that they will show a component with radial velocities less than or equal to 10 km/s, which is attributed mainly to gas in the galactic disk with redshifts less than or equal to 1 kpc based on comparisons with high-latitude stars. Higher velocity components of both Na I and Ca II were found in 3C 273 at -22 and +28 km/s and in Mkn 509 at 61 km/s. It is shown that the negative velocity in 3C 273 and the wing in SN 1980n are inconsistent with halo gas corotating with the disk or even with the circular velocity decreasing with increasing distance from the plane. The data also indicate that the Magellanic Clouds and Stream are not on typical sight lines through the halo. The ratio of Ca II to Na I column densities is found to be high compared with typical stars shining through H I clouds in the galactic plane, which suggests that both the low and high-velocity clouds in this survey are more typical of intercloud gas where calcium is much less depleted.

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