HD molecular lines in an absorption system at redshift z=2.3377

Authors
Varshalovich, DA Ivanchik, AV Petitjean, P Srianand, R Ledoux, C
Citation
Da. Varshalovich et al., HD molecular lines in an absorption system at redshift z=2.3377, ASTRON LETT, 27(11), 2001, pp. 683-685
Citations number
10
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
ISSN journal
10637737 → ACNP
Volume
27
Issue
11
Year of publication
2001
Pages
683 - 685
Database
ISI
SICI code
1063-7737(200111)27:11<683:HMLIAA>2.0.ZU;2-G
Abstract
Having analyzed the spectrum of the quasar PKS 1232+0.82 taken by Petitjean et al. (2000), we identified HD molecular lines in an absorption system at redshift z = 2.3377. We estimated the column density of HD molecules in th is system, N(HD) = (1-4) x 10(14) cm(-2). The excitation temperature of the first rotational level J=1 relative to the ground state J=0 is T-ex = 70 /-7 K. As far as we know, this is the first detection of HD molecules at hi gh redshift. (C) 2001 MAIK "Nauka/Interperiodica".