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The study of ionized gas kinematics in high- z active galaxies plays a key part in our understanding of galactic evolution, in an age where nuclear activity was widespread and star formation close to its peak. We present a study of TXS 0952−217, a radio galaxy at z = 2.95, using VLT/MUSE integral field optical spectroscopy as part of a project aimed studying of the properties of ionized gas in high redshift radio galaxies (HzRGs). The Ly α line profile of this object presents various emission and absorption components. By utilizing Voronoi binning, we obtained a comprehensive map of the kinematic properties of these components. These observations revealed the presence of a redshifted, high velocity ( v ∼ 500 km s −1 ) bipolar structure of Ly α emission, most likely corresponding to an outflow of ionized gas. The outflow extends beyond the compact radio source on both sides, with a total size of ∼21 kpc. Its kinetic power (10 42.1 erg s −1 ) is about five orders of magnitude smaller than its radio power. Additional ionized lines, including HeII λ 1640, CIV λ 1550 and CIII] λ 1908 were detected and their line flux ratios determined. The presence of HeII allowed for a precise redshift measurement ( z = 2.945 ± 0.002). Along with the recent discovery of a similar structure in TN J1049−1258, another HzRG, it displays the feasibility of using Ly α as a tracer of outflowing gas in high redshift sources, and particularly so when supported by non-resonant ionized lines such as HeII, which allow for accurate redshift and velocity measurements.
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