Hydrogen and metal absorption lines in PKS 0405-123 from the halos of low redshift galaxies

Details Hydrogen and metal absorption lines in PKS 0405-123 from the halos of low redshift galaxies Hydrogen and metal absorption lines in PKS 0405-123 from the halos of low redshift galaxies

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106....1s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 1-5.

Astronomy and Astrophysics

Astronomy

30

Absorption Spectra, Galactic Halos, Hydrogen, Metals, Red Shift, Resonance Lines, Hubble Space Telescope, Lyman Alpha Radiation, Ultraviolet Spectra, Visible Spectrum

Scientific paper

HST ultraviolet spectra and ground-based optical spectra of the bright quasar PKS 0405-123 are used to identify two absorption-line systems probably produced by the halos of foreground galaxies. The quasar lies in a rich galaxy field. Loose groups of galaxies are present in the field at mean z1 = 0.1669 and mean z2 = 0.3519. Ly-alpha, C IV 1549 A, and probably Mg II 2798 A resonance lines are detected in an absorption system at z = 0.1670. An absorption system consisting of only Ly-alpha is observed at z = 0.3516. We cannot be completely certain which foreground galaxy is responsible for the metal line absorption system at z1. A likely candidate is a large, luminous, early-type spiral 40 arcsec to the east of the quasar. However, the origin of the z1 system could possibly be a small undetected galaxy more precisely aligned along our line of sight to PKS 0405-123, or a very faint galaxy whose redshift has not yet been measured.

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