| Detection of broad 21-cm absorption at z(abs)=0.656 in the complex sight-line towards 3C 336 (2007) | |||||||||||||
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| 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 | |||||||||||||
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