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Title:
Detection of broad 21-cm absorption at zabs = 0.656 in the complex sight-line towards 3C336
Authors:
Curran, S. J.; Tzanavaris, P.; Murphy, M. T.; Webb, J. K.; Pihlström, Y. M.
Affiliation:
AA(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia), AB(Institute of Astronomy and Astrophysics, National Observatory of Athens, I. Metaxa & V. Paulou, 152 36 Penteli, Greece), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AD(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia), AE(Department of Physics and Astronomy, The University of New Mexico, Albuquerque, NM 87131, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 381, Issue 1, pp. L6-L10. (MNRAS Homepage)
Publication Date:
10/2007
Origin:
MNRAS
MNRAS Keywords:
galaxies: individual: 3C336 , galaxies: ISM , quasars: absorption lines , cosmology: observations , early Universe
DOI:
10.1111/j.1745-3933.2007.00354.x
Bibliographic Code:
2007MNRAS.381L...6C

Abstract

We report the detection of 21-cm absorption at zabs = 0.656 towards 1622 + 238 (3C336). The line is very broad with a full width to half-maximum of 235 km s-1, giving a velocity-integrated optical depth of . The centroid of the line is offset from that of the known damped Lyman α absorption system (DLA) by 50 km s-1, and if the Lyman α and 21-cm absorption are due to the same gas, we derive a spin temperature of Ts <= 60 K, which would be the lowest yet in a DLA. The wide profile, which is over four times wider than that of any other DLA, supports the hypothesis that the hydrogen absorption is occurring either in the disc of a large underluminous spiral or in a group of dim unidentified galaxies, associated with the single object which has been optically identified at this redshift.
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