Detection of CA II absorption in the spectrum of the QSO 0446-208 due to an intervening galaxy

Details Detection of CA II absorption in the spectrum of the QSO 0446-208 due to an intervening galaxy Detection of CA II absorption in the spectrum of the QSO 0446-208 due to an intervening galaxy

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..669b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Feb. 1981, p. 669-678. Research supported by the Australian Resear

Astronomy and Astrophysics

Astronomy

48

Absorption Spectra, Calcium, H Lines, Interstellar Matter, K Lines, Quasars, Stellar Spectra, Doppler Effect, Emission Spectra, Red Shift, Sodium, Spectral Line Width

Scientific paper

The detection of Ca II H and K absorption lines attributed to an intervening galaxy in the spectrum of the quasar 0446-208 is reported. Intermediate dispersion observations were obtained of the region containing the quasar and an intervening disk galaxy situated 13 arcsec from the quasar in the spectral regions 3700-4700 and 3400-4400 A. Lines observed in the quasar spectrum at wavelengths of 4159.6 and 4233.5 A are identified with Ca II K and H absorption lines, respectively, at a redshift of 0.0666, which is similar to that of the nuclear region of the galaxy 13 arcsec away (0.0669). The column density of this absorption is calculated to be 11 (+5 or -3) x 10 to the 12th/sq cm, with a Doppler width of 90 + or - 20 km/sec. Direct imaging and spectra indicate that the galaxy is a probable S0 system. The observations tend to support the disk origin of the galactic absorption, although halo absorption cannot be ruled out, and are consistent with the view that quasar absorption lines may originate in intervening galaxies.

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