EDP Sciences
Free Access
Volume 417, Number 2, April II 2004
Page(s) 487 - 498
Section Extragalactic astronomy
DOI https://doi.org/10.1051/0004-6361:20034371

A&A 417, 487-498 (2004)
DOI: 10.1051/0004-6361:20034371

Integral field spectroscopy of extended Ly $\mathsf{\alpha}$ emission from the DLA galaxy in Q2233+131

L. Christensen1, S. F. Sánchez1, K. Jahnke1, T. Becker1, L. Wisotzki1, 2, A. Kelz1, L. C. Popovic1, 3 and M. M. Roth1

1  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2  Potsdam University, Am Neuen Palais 10, 14469 Potsdam, Germany
3  Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Serbia

(Received 22 September 2003 / Accepted 15 December 2003 )

This paper presents observations of an extended Lyman- $\alpha$ emission nebula surrounding the galaxy responsible for the Damped Lyman- $\alpha$ Absorption (DLA) line in the spectrum of the quasar Q2233+131 . With the Potsdam Multi Aperture Spectrophotometer (PMAS) we measure the properties of the extended Ly $\alpha$ emission in an area of $3\arcsec$  $\times$ $5\arcsec$ having a total line flux of ( 2.8  $\pm$ 0.3)  $\times$ 10-16 erg cm -2 s -1, which at redshift z=3.15 corresponds to a luminosity of ( $2.4_{-0.2}^{+0.3})\times10^{43}$ erg s -1 and a size of 23  $\times$ 38 kpc. The location of the emission is spatially coincident with the previously detected DLA galaxy, but extends significantly beyond its limb. We argue that the Ly $\alpha$ emission is likely to be caused by an outflow from the DLA galaxy, presumably powered by star formation. In the case of negligible dust extinction, the Ly $\alpha$ luminosity indicates a star-formation rate of 19  $\pm$ $10~M_{\odot}$ yr -1 consistent with that derived from the UV continuum flux from the parent galaxy. The wind velocity indicated by the integral field spectra is of the order of several hundred km s -1. We find no indication of emission originating in a rotating disk.

Key words: galaxies: high redshift -- galaxies: quasars: absorption lines -- galaxies: kinematics and dynamics -- galaxies: quasars: individual: Q2233+131

Offprint request: L. Christensen, lchristensen@aip.de

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