EDP Sciences
Free Access
Issue
A&A
Volume 417, Number 2, April II 2004
Page(s) 487 - 498
Section Extragalactic astronomy
DOI https://doi.org/10.1051/0004-6361:20034371
Published online 19 March 2004


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 )

Abstract
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

SIMBAD Objects



© ESO 2004

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.