Detection of broad 21-cm absorption at zabs=0.656 in the complex sight-line towards 3C 336

被引：27

作者：

Curran, S. J. ^{[1
]}

Tzanavaris, P.

Murphy, M. T.

Webb, J. K.

Pihlstroem, Y. M.

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[2] Natl Observ Athens, Inst Astron & Astrophys, Penteli, Greece

[3] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[4] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2007年 / 381卷 / 01期

关键词：

galaxies : individual : 3C 336; galaxies : ISM; quasars : absorption lines; cosmology : observations; early Universe;

D O I：

10.1111/j.1745-3933.2007.00354.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of 21-cm absorption at z(abs) = 0.656 towards 1622 + 238 (3C 336). The line is very broad with a full width to half-maximum of 235 km s(-1), giving a velocity-integrated optical depth of integral tau dv = 2.2 +/- 0.2 kms(-1). The centroid of the line is offset from that of the known damped Lyman a absorption system (DLA) by 50 km s(-1), and if the Lyman alpha 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.

引用

页码：L6 / L10

页数：5

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