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arXiv:astro-ph/0011470 (astro-ph)
[Submitted on 25 Nov 2000]

Title:Molecular hydrogen abundance in the dust-free damped Ly-alpha galaxy at z = 3.4

Authors:S. A. Levshakov (1), P. Molaro (2), M. Centurion (2), S. D'Odorico (3), P. Bonifacio (2), G. Vladilo (2) ((1)Ioffe Institute, St.Petersburg, Russia; (2)Osservatorio Astronomico di Trieste, Italy; (3)ESO, Garching, Germany)
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Abstract: New results from the search for H2 absorption in the damped Ly-alpha galaxy at redshift z = 3.4 toward QSO 0000-2620 (z_em = 4.1) are reported. The high-resolution (lambda/Delta lambda = 48,000) spectra of Q0000-2620 were obtained using the Ultraviolet - Visual Echelle Spectrograph (UVES) on the 8.2m ESO Kueyen telescope. The ortho-H2 column density is found to be N(J=1) = (5.55 +/- 1.35) 10^{13} cm^{-2} (2sigma C.L.). The combination of N(J=1) with the limits available for other low rotational levels restricts the excitation temperature T_ex in the range (290-540) K. This gives the total H2 column density of N(H2) = (8.75 +/- 1.25) 10^{13} cm^{-2} and the corresponding fraction of hydrogen atoms bound in molecules of f(H2) = (6.8 +/- 2.0) 10^{-8}.
Comments: 4 pages, 1 eps figure, to appear in Proceed. ESO/ST-ECF/STScI Workshop on Deep Fields, held in Garching, 9-12 October 2000
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011470
  (or arXiv:astro-ph/0011470v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011470
Related DOI: https://doi.org/10.1007/10854354_95

Submission history

From: Sergei Levshakov [view email]
[v1] Sat, 25 Nov 2000 13:29:46 UTC (60 KB)
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