HD molecular lines in an absorption system at redshift z=2.3377 |
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| Authors: | D. A. Varshalovich A. V. Ivanchik P. Petitjean R. Srianand C. Ledoux |
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| Affiliation: | (1) Ioffe Physicotechnical Institute, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia;(2) Institut d’Astrophysique, Paris, France;(3) IUCAA, Pune, India;(4) ESO, München, Germany |
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| 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 this system, N(HD) = (1?4) × 1014cm?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 high redshift. |
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| Keywords: | quasar spectra observational cosmology |
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