Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.6001d&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #60.01; Bulletin of the American Astronomical Society, Vol. 26, p.959
Astronomy and Astrophysics
Astronomy
Scientific paper
We present UV (FOS) and optical (WFPC II) observations of the z = 0.43685 absorption system in 3CR 196 ( zem = 0.8714, V = 17.79). The system is clearly seen in 21 cm. We obtained two sets of HST/FOS data at a resolution of =~ 200, using the low resolution grating G160L, with the large 4.3" aperture, and the 1.0" circular aperture, respectively. The wavelength coverage of the observations is from 1600 Angstroms to 2450 Angstroms . The region of the Lyalpha \ line is seriously confused by a Lyman limit and strong, broad high-ionization lines from the za =~ zem system. We conclude that a damped Lyalpha \ line is present at z = 0.43685 with a best fit column density of N(H I) =~ 2times 10(20) cm(-2) . The minimum column density N(H I) required is 5times 10(19) cm(-2) . We have recently obtained a Post-Costar WFPC II image of 3CR 196. We can clearly see a spiral galaxy located approximately 2" from the QSO, implying an impact parameter of =~ 8 kpc, assuming H_0=75\ and q_0=0.5 This work is part of Goddard High Resolution Spectrograph Guaranteed Time Observations and is supported by NASA grant No. NAG5-1858.
Barlow Thomas A.
Beaver Edward A.
Cohen Ross D.
Diplas Athanassios
Junkkarinen Vesa T.
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