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A survey for DLA galaxies with integral field spectroscopy

Published online by Cambridge University Press:  06 October 2005

Lise Christensen ,
Sebastián. F. Sánchez ,
Knud Jahnke ,
Martin M. Roth  and
Lutz Wisotzki
Lise Christensen
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected]
Sebastián. F. Sánchez
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected] Centro Astronomico Hispano Aleman de Calar Alto, Spain
Knud Jahnke
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected]
Martin M. Roth
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected]
Lutz Wisotzki
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected] University of Potsdam, Am neuen Palais 10, 14469 Potsdam, Germany
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Abstract

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Using integral field spectroscopy (IFS) we have observed QSOs which were previously known to have intervening DLAs, to search for emission lines in the field surrounding the QSOs. The sample consists of 13 DLAs plus 7 sub-DLAs at $z>2$, from which we find emission line candidates at the expected wavelengths for 8 systems, implying a detection frequency of 40%. Emission lines detected at the DLA redshifts are interpreted as being due to Ly$\alpha$ lines from galaxies associated with the DLA clouds. Candidates are detected at $3-4\sigma$ levels in both narrow-band images and spectra created from the data cubes. We find no preference for candidate detection associated with either high or low metallicity DLAs. In comparison with the properties of previously known DLA galaxies, the candidates show similar distributions of line fluxes and line widths, but their impact parameters are slightly different, suggesting H I cross sections larger than 10 kpc.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 74 - 79
Copyright
© 2005 International Astronomical Union