Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232...54s&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 54-59.
Astronomy and Astrophysics
Astrophysics
16
Absorption Spectra, Astronomical Spectroscopy, Line Spectra, Quasars, Abundance, Interstellar Matter, Red Shift, Spectral Line Width, Spin Temperature
Scientific paper
Five (and possibly eight) weak absorption lines have been detected in the average of 14 IDS spectra of the quasar 3C 286. These optical lines have a redshift identical to the 21-cm absorption line found by Brown and Roberts (1973) at z = 0.692. The observed lines are identified with transitions in Mg I, Mg II, and Fe II. The measured equivalent widths are comparable to those along the lines of sight to several stars in the Galaxy as measured by Copernicus, and they are slightly weaker than those found in the z = 0.85 system of AO 0235 + 164. Adopting a typical interstellar spin temperature of 80 K results in relative ion abundances (Mg I/H, Mg II/H, and Fe II/H) comparable to galactic interstellar values. Although no evidence is found for the 2200-A feature associated with galactic dust, these observations are consistent with absorption in an intervening galaxy.
McKee Christopher F.
Spinrad Hyron
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