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Title:
HI 21 cm absorption at z ~ 2.347 towards PKS B0438-436
Authors:
Kanekar, N.; Subrahmanyan, R.; Ellison, S. L.; Lane, W. M.; Chengalur, J. N.
Affiliation:
AA(National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA), AB(Australia Telescope National Facility, CSIRO, Locked bag 194, Narrabri, NSW 2390, Australia), AC(Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 1A1, Canada), AD(US Naval Research Laboratory, Code 7213, 4555 Overlook Avenue SW, Washington, DC 20375, USA), AE(Australia Telescope National Facility, CSIRO, Locked bag 194, Narrabri, NSW 2390, Australia; National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune 411 007, India)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 370, Issue 1, pp. L46-L50. (MNRAS Homepage)
Publication Date:
07/2006
Origin:
MNRAS
MNRAS Keywords:
galaxies: high-redshift , galaxies: ISM , radio lines: galaxies
DOI:
10.1111/j.1745-3933.2006.00186.x
Bibliographic Code:
2006MNRAS.370L..46K

Abstract

We report the detection of redshifted HI 21-cm absorption in the z ~ 2.347 damped Lyman α absorber (DLA) towards PKS B0438-436 with the Green Bank Telescope. This is the second-highest redshift at which 21-cm absorption has been detected in a DLA. The absorption extends over ~60 km s-1 and has two distinct components, at z = 2.347477(12) and z = 2.347869(20). A similar velocity structure is seen in optical metal lines, although the peak absorption here is offset by ~11 km s-1 from the peak in the 21-cm line. We obtain a high spin temperature Ts ~ (886 +/- 248) × (f/0.58) K, using a covering factor estimated from 2.3-GHz very long baseline interferometry data. However, the current data cannot rule out a low spin temperature. The non-detection of CO 3-2 absorption places the upper limit NCO < 3.8 × 1015 (Tx/10) cm-2 on the CO column density.

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