Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379..226s&link_type=abstract
Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,
Physics
Scientific paper
We exploit the gravitational potential of a massive, rich cluster as a natural magnifying glass to study the internal properties of the highly magnified galaxy at z=4.88. Using high resolution HST imaging we construct a detailed mass model and, together with optical (VIMOS) and near-infrared (SINFONI) Integral Field Spectroscopy, we have mapped the source-frame morphology of the lensed galaxy behind galaxy cluster RCS0224-002 on 200pc scales to find an ˜L^{*} Lyman-break galaxy with a dynamical mass of 1.0×10^{10} M_{&sun;} within 2 kpc and infer an integrated star-formation rate of just 12±2 M_{&sun;} yr^{-1}. By combing the spatially resolved velocities from the [O II] and Lyα emission and UV ISM absorption lines we suggest that this galaxy is surrounded by a galactic-scale bi-polar outflow which has recently burst out of the system and is escaping at a speed of ˜500 km s^{-1}. The geometry and velocity of the outflow suggests that the ejected material is travelling far faster than escape velocity and we estimate that it will travel at least 1 Mpc (comoving) before eventually stalling. The enriched, outflowing material is therefore efficient at expelling baryons which are likely to subsequently play no further part in the star-formation history of this galaxy, but rather will pollute the IGM in a volume of at least 3Mpc^{3}.
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