Abstract
We 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.
Original language | English (US) |
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Pages (from-to) | 67-73 |
Number of pages | 7 |
Journal | Astrophysical Journal |
Volume | 474 |
Issue number | 1 PART I |
DOIs | |
State | Published - 1997 |
Externally published | Yes |
Keywords
- Cosmic microwave background
- Quasars: absorption lines
- Quasars: individual (QSO 0013-004)
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science