Detection of 21 centimeter absorption at Z = 2.04 in the QSO PKS 0458-02

Details Detection of 21 centimeter absorption at Z = 2.04 in the QSO PKS 0458-02 Detection of 21 centimeter absorption at Z = 2.04 in the QSO PKS 0458-02

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294l..67w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 294, July 15, 1985, p. L67-L72.

Astronomy and Astrophysics

Astronomy

61

Absorption Spectra, Centimeter Waves, Galaxies, Quasars, Radio Sources (Astronomy), Disks (Shapes), Lyman Alpha Radiation, Radio Spectra, Red Shift

Scientific paper

The paper reports the detection of 21 cm absorption at the redshift z = 2.03945 + or - 0.00008 in the radio continuum of the QSO PKS 0458-02. This is the largest redshift yet found at radio wavelengths. It corresponds to an optical redshift inferred from damped Ly-alpha and C II, C II(asterisk), and Si IV absorption. The 21 cm spectrum reveals two narrow and deep components. Comparison with the column density inferred from Ly-alpha reveals that the spin temperature is less than 1000 K. It is shown that each component cannot arise in a single pressure-confined cloud. Rather, it is suggested that the absorption site is a highly redshifted galactic disk, or possibly two isolated, self-gravitating clouds.

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