Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1304c&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #13.04; Bulletin of the American Astronomical Society, Vol. 26, p.1330
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained a UV spectrum of PKS 1229--021 with the FOS/G160L and an R band image using WFPC II, as part of a program to identify the galaxies responsible for moderate redshift 21 cm absorption in quasar spectra. The wide field camera image clearly shows a luminous galaxy centered within 1" of the QSO. This galaxy has also been detected by Steidel et al. (1994). The spectrum shows a damped Lyalpha \ line at the 21 cm redshift, z=0.395, indicating a column density in neutral hydrogen of approximately 2 times 10(20) \ cm(-2) . Measurement of the damped Lyalpha \ line required a spectral fit incorporating several Lyman limit systems which are confirmed by the detection of Mg II absorption in new optical spectra. In contrast with measurements in higher redshift damped Lyalpha \ systems, comparison with the 21 cm absorption line (Brown and Spencer 1979) suggests a low spin temperature similar to that seen in Galactic clouds. There is considerable uncertainty, however, because PKS 1229--021 is an extended radio source. These observations are part of the GHRS GTO program and are supported by NASA grant NAG 5--1858.
Beaver Edward A.
Cohen Ross D.
Diplas Athanassios
Junkkarinen Vesa T.
Lyons Ron W.
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