Interstellar absorption lines in the directions of extragalactic objects. II - Analysis of 25 sight lines

Details Interstellar absorption lines in the directions of extragalactic objects. II - Analysis of 25 sight lines Interstellar absorption lines in the directions of extragalactic objects. II - Analysis of 25 sight lines

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..927m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 15, 1986, p. 927-948.

Astronomy and Astrophysics

Astronomy

46

Absorption Spectra, Globular Clusters, Interstellar Matter, Line Spectra, Supernovae, Visible Spectrum, Calcium, Sodium, Spectral Resolution, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

Observations of galactic Ca II, and in some cases Na I, interstellar absorption with resolutions as fine as 17km s-1 FWHM are reported for the sources Fairall 9, Akn 120, NGC4593, IC4329A, 2155-304, 2251-178, 2302-089, the 1981 supernovae in NGC 1316 and 4536 and the star K996 in the globular cluster NGC 7078. The analysis has been augmented with five sources from Blades & Morton (Paper I) and 10 published elsewhere. All objects have a Ca II K line with ∣ >VLSR ∣ <17km s-1 and an equivalent width in the range 80-400 mÅ, which may be attributed to local disc gas. In addition six objects have K components at intermediate velocities 20< ∣ VLSR <90 km s-1, which are thought to originate at greater distances, though three of the lines are incompatible with halo gas corotating with the disc, implying large peculiar motions. Eight objects with resolution < 25 km s-1 FWHM have no components in this intermediate velocity range to a limiting column density of about logN < 12.0 cm-2. Comparison of the sight lines to the extragalactic objects with stars at various distances and galactic latitudes shows that the Ca II is concentrated in a thick disc with a scale height of about 1(+1, -0.5) kpc.

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