Kanekar, N. ; Chengalur, J. N. ; Subrahmanyan, R. ; Petitjean, P. (2001) ATCA search for 21 cm emission from a candidate damped Ly-α absorber at z = 0.101 Astronomy & Astrophysics, 367 (1). pp. 46-50. ISSN 0004-6361
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Official URL: http://doi.org/10.1051/0004-6361:20000420
Related URL: http://dx.doi.org/10.1051/0004-6361:20000420
Abstract
We report a deep search for 21 cm emission/absorption from the z ∼ 0.101 candidate damped Lyman-α system towards PKS 0439−433, using the Australia Telescope Compact Array (ATCA). The spectrum shows a weak absorption feature – at the 3.3σ level – which yields a lower limit of 730 K on the spin temperature of the system. No H i emission was detected: the 3σ upper limit on the H i mass of the absorber is 2.25 10-1 M⊙, for a velocity spread of ∼70 km s-1. The low H i mass and the high spin temperature seem to rule out the possibility that the absorber is a large gas-rich spiral galaxy.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The European Southern Observatory. |
| Keywords: | Cosmology: Observations; Galaxies: Individual: PKS 0439–433; Radio Lines: General. |
| ID Code: | 118138 |
| Deposited On: | 14 May 2021 10:22 |
| Last Modified: | 14 May 2021 10:22 |
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