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Abstract: Damped Lyman-alpha systems DLAs seen in the spectra of high-z QSOs allow usto probe the physical conditions in protogalaxies. Our understanding ofphysical conditions in DLAs at high-z is primarily based on the absorptionlines of H 2 molecules and fine-structure transitions. Another important way ofprobing the thermal state of interstellar medium in these systems is bystudying the 21-cm absorption in the spectra of background quasars. Here wereport the main results of our GMRT survey to search for 21-cm absorption in arepresentative and unbiased sample of 35 DLA candidates at 1.10


Author: N. Gupta ATNF, R. Srianand IUCAA, P. Petitjean IAP, P. Noterdaeme IUCAA, D. J. Saikia TIFR

Source: https://arxiv.org/







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