ORT observations of the damped Lyman α system towards PKS 0201+ 113

Kanekar, Nissim ; Chengalur, Jayaram N. (1997) ORT observations of the damped Lyman α system towards PKS 0201+ 113 Monthly Notices of the Royal Astronomical Society, 292 . pp. 831-834. ISSN 0035-8711

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We report a deep radio search with the Ooty Radio Telescope (ORT) for the redshifted 21-cm absorption line from the damped Lyman-α system seen at redshift 3.388 against the quasar PKS 0201 + 113. This is currently the most distant system for which a detection of the 21-cm absorption line has been claimed. The present observations have a sensitivity comparable to the earlier ones and detect no statistically significant absorption. We use the nondetection to place an upper limit of ~ 0.011 on the optical depth of the damped Lyman-α absorber. This corresponds to a lower limit of ~ 5600 K to the spin temperature of the system. This is considerably higher than the previous upper limit of ~ 1380 K.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Quasars: Absorption Lines; Quasars: Individual; PKS 0201 + 113; Cosmology: Observations
ID Code:63544
Deposited On:29 Sep 2011 04:02
Last Modified:29 Sep 2011 04:02

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