A 21 Centimeter Absorber Identified with a Spiral Galaxy: Hubble Space Telescope Faint Object Spectrograph and Wide-Field Camera Observations of 3CR 196

Details A 21 Centimeter Absorber Identified with a Spiral Galaxy: Hubble Space Telescope Faint Object Spectrograph and Wide-Field Camera Observations of 3CR 196 A 21 Centimeter Absorber Identified with a Spiral Galaxy: Hubble Space Telescope Faint Object Spectrograph and Wide-Field Camera Observations of 3CR 196

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456..132c&link_type=abstract

Astrophysical Journal v.456, p.132

Astronomy and Astrophysics

Astronomy

13

Galaxies: Ism, Galaxies: Quasars: Individual Alphanumeric: 3Cr 196, Galaxies: Quasars: Absorption Lines, Radio Lines: Galaxies

Scientific paper

We present imaging and spectroscopy of the quasar 3CR 196 (ze = 0.871), which has 21 cm and optical absorption at za = 0.437.
We observed the region of Lyα absorption in 3CR 196 at za = 0.437 with the Faint Object Spectrograph on the Hubble Space Telescope. This region of the spectrum is complicated because of the presence of a Lyman limit and strong lines from a za ≍ ze system. We conclude that there is Lyα absorption with an H I column density greater than 2.7 × 1019 cm-2 and most probably 1.5 × 1020 cm-2. Based on the existence of the high H I column density along both the optical and radio lines of sight, separated by more than 15 kpc, we conclude that the Lyα absorption must arise in a system comparable in size to the gaseous disks of spiral galaxies.
A barred spiral galaxy, previously reported as a diffuse object in the recent work of Boissé & Boulade, can be seen near the quasar in an image taken at 0" 1 resolution with the Wide Field Planetary Camera 2 on the HST. If this galaxy is at the absorption redshift, the luminosity is approximately L*, and any H I disk should extend in front of the optical quasar and radio lobes of 3CR 196, giving rise to both the Lyα and 21 cm absorption.
In the za ≍ ze system we detect Lyman lines and the Lyman limit, as well as high ion absorption lines of C III, N V, S VI, and O VI. This absorption probably only partially covers the emission-line region. The ionization parameter is approximately 0.1. Conditions in this region may be similar to those in broad absorption line QSOs.

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