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A damped Ly$\alpha$ system along two lines of sight at $z=0.93$

Published online by Cambridge University Press:  06 October 2005

S. Lopez ,
Dieter Reimers ,
Michael D. Gregg ,
Lutz Wisotzki ,
Olaf Wucknitz  and
Andres Guzman
S. Lopez
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile. email: slopez@das.uchile.cl
Dieter Reimers
Affiliation:
Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
Michael D. Gregg
Affiliation:
Physics Department, University of California, Davis, CA 95616 Institute of Geophysics & Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550
Lutz Wisotzki
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Olaf Wucknitz
Affiliation:
Institut für Physik, Universität Potsdam, Am Neuen Palais, D-14469 Potsdam, Germany
Andres Guzman
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile. email: slopez@das.uchile.cl
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Abstract

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HE0512–3329 is a gravitationally-lensed double QSO with damped Ly$\alpha$ systems observed at $z=0.931$ in front of both QSO images (DLA A and B). We have obtained spatially resolved HST STIS and optical VLT UVES spectra of both QSOs in order to study differences in the metal abundances across the lines of sight. We detect substantial differences, of roughly 0.5 dex, in both [Mn/H] and [Fe/H], on a transverse scale of 5 $h^{-1}$ kpc. Differential dust depletion appears as the most plausible explanation.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 445 - 447
Copyright
© 2005 International Astronomical Union