Jian Ge et al. 1997 ApJ 474 67 doi:10.1086/303426
Jian Ge1, Jill Bechtold1 and John H. Black1
Show affiliationsWe present detections of absorption from the ground state and excited states of C I in the z = 1.9731 damped Lyα system of the QSO 0013-004. The excitation temperature between the J = 0 and J = 1 fine-structure levels of C I is 11.6 ± 1.0 K. We estimate other contributions to the excitation of the C I fine-structure levels, and use the population ratio of the excited state to the ground state to derive an estimate for the cosmic microwave background radiation (CMBR) temperature of T = 7.9 ± 1.0 K at 0.61 mm and z = 1.9731, which is consistent with the predicted value of T = 8.105 ± 0.030 K from the standard cosmology.
cosmic microwave background; quasars: absorption lines; quasars: individual (QSO 0013–004)
Issue 1 (1997 January 1)
Received 1995 June 13, accepted for publication 1996 July 18
Jian Ge et al. 1997 ApJ 474 67
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