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Chengalur (4) ((1) NRAO, Nissim Kanekar (1), USA; (2) ESO","submitted_at":"2009-09-14T01:47:20Z","abstract_excerpt":"We report evidence for an anti-correlation between spin temperature $T_s$ and metallicity [Z/H], detected at $3.6 \\sigma$ significance in a sample of 26 damped Lyman-$\\alpha$ absorbers (DLAs) at redshifts $0.09 < z < 3.45$. The anti-correlation is detected at $3 \\sigma$ significance in a sub-sample of 20 DLAs with measured covering factors, implying that it does not stem from low covering factors. We obtain $T_s = (-0.68 \\pm 0.17) \\times {\\rm [Z/H]} + (2.13 \\pm 0.21)$ from a linear regression analysis. 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