Abstract
We present new spectroscopic observations of two high redshift radio
galaxies, TXS 0211-122 (z=2.34) and TXS 0828+193 (z=2.57), known to be
associated with large Ly$\alpha$ halos. The observations were taken with the
slits placed perpendicularly to the radio axis. With access to pre-existing
Keck II observations taken with the slit placed along the radio axis we are
able to compare the properties of the gas in different regions of the galaxies.
In both objects we detect spatially extended Ly$\alpha$ emission
perpendicularly to the radio axis. In TXS 0211-122, the flux and velocity
profiles of Ly$\alpha$ are strongly affected by HI absorption/scattering. In
line with previous studies, we find evidence for outflowing gas along the radio
axis which may be the result of jet-gas interactions. In the slit oriented
perpendicularly to the radio axis we find less perturbed gas kinematics,
suggesting outflows of ionized gas in this object are focused along the radio
jet axis. Additionally, we find evidence for a giant, UV-emitting arc or
shell-like structure surrounding the radio galaxy Ly$\alpha$ halo, possibly
resulting from feedback activity.
In TXS 0828+193 a large Ly$\alpha$ halo ($\sim$56 kpc) is detected
perpendicularly to the radio axis. Along both slit position angles we find
evidence for outflowing gas, which we argue is part of an approximately
spherical, expanding shell or bubble of gas powered by feedback activity in the
central regions of the galaxy. Our results suggest a diversity in the spatial
distribution of ionized outflows in powerful radio galaxies at z$\sim$2.5.
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