The ultraviolet absorption spectrum of the quasar H1821+643 (z = 0.297)

Details The ultraviolet absorption spectrum of the quasar H1821+643 (z = 0.297) The ultraviolet absorption spectrum of the quasar H1821+643 (z = 0.297)

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397...68b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 68-80.

Astronomy and Astrophysics

Astrophysics

47

Absorption Spectra, Galactic Evolution, Hubble Space Telescope, Quasars, Ultraviolet Absorption, Ultraviolet Spectra, Emission Spectra, Faint Objects, Galactic Clusters, High Resolution, Lyman Alpha Radiation, Red Shift

Scientific paper

High resolution UV observations of the nearby luminous quasar H1821+643 are reported. A complete sample of 38 absorption lines has been constructed. There are five strong extragalactic Ly-alpha absorption lines in the spectrum, all with observed equivalent widths greater than 0.45 A. The local number density of Ly-alpha systems with rest equivalent widths larger than 0.32 A is estimated to be 13 +/- 5 Ly-alpha lines per unit redshift. Some of the Ly-alpha systems with redshifts significantly different from the quasar appear to be associated with galaxies or with clusters of galaxies. Two of the Ly-alpha lines have the same redshift within 400 km/s as that of an emission-line galaxy located at a projected separation from the quasar of about 90 kpc. One of the Ly-alpha systems in H1821+643 occurs at an a absorption redshift approximately equal to the emission-line redshift of the quasar and is accompanied by absorption from the C IV and of VI doublets; this is an example of associated absorption for large-redshift quasars.

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