The broad absorber at z = 3.02 toward CTQ 325

S. A. Levshakov; S. D'Odorico; I. I. Agafonova; M. Dessauges-Zavadsky

doi:10.1051/0004-6361:20031559

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Volume 413 / No 3 (January III 2004)

A&A, 413 3 (2004) 827-831

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Issue		A&A Volume 413, Number 3, January III 2004


Page(s)		827 - 831
Section		Cosmology (including clusters of galaxies)
DOI		https://doi.org/10.1051/0004-6361:20031559
Published online		07 January 2004

A&A 413, 827-831 (2004)

The broad $\ion{O}{vi}$ absorber at z = 3.02 toward CTQ 325 ^*

S. A. Levshakov¹, S. D'Odorico², I. I. Agafonova¹ and M. Dessauges-Zavadsky³

¹ Department of Theoretical Astrophysics, Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
² European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
³ Observatoire de Genève, 1290 Sauverny, Switzerland

Corresponding author: S. A. Levshakov, lev@astro.ioffe.rssi.ru

Received: 19 August 2003
Accepted: 29 September 2003

Abstract

We report on the multiphase absorption-line system detected at a redshift $z_{\rm abs}=3.021$ in the spectrum of the quasi-stellar object CTQ 325 ( $z_{\rm em}= 3.212$ ). The system is displaced by $\simeq$ $14\,000$ km s^-1 to the blue of the systemic velocity defined by the center of the symmetric $\ion{O}{i}$ quasar emission line. It consists of shallow and broad (~700 km s^-1 FWHM) absorption lines of $\ion{H}{i}$ $\lambda1215$ , $\ion{C}{iv}$ $\lambda\lambda1548, 1550$ , and $\ion{O}{vi}$ $\lambda\lambda1032, 1038$ , produced by collisionally ionized gas and of narrow absorption lines ( ${\it FWHM} < 20$ km s^-1) of Ly $_{\alpha, \beta, \ldots, 6}$ , $\ion{Si}{iii}$ $\lambda1206$ , and $\ion{C}{iii}$ $\lambda977$ produced by photoionized gas. Possible origins of this system are discussed.

Key words: cosmology: observations / line: formation / line: profiles / galaxies: abundances / quasars: absorption lines / quasars: individual: CTQ 325

^*

Based on observations obtained at the VLT Kueyen telescope (ESO, Paranal, Chile), the ESO programme 69.A-0123.

© ESO, 2004

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The broad absorber at z = 3.02 toward CTQ 325 *

The broad $\ion{O}{vi}$ absorber at z = 3.02 toward CTQ 325 ^*