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- W4313265354 abstract "We present Keck Cosmic Web Imager (KCWI) integral field spectroscopy (IFS) observations of rest-frame UV emission lines $rm Lyalpha$, C IV $lambda lambda$ 1548 AA, 1550AA and He II 1640 AA observed in the circumgalactic medium (CGM) of two $z=2$ radio-loud quasar host galaxies. We detect extended emission on 80-90 kpc scale in $rm Lyalpha$ in both systems with C IV, and He II emission also detected out to 30-50 kpc. All emission lines show kinematics with a blue and redshifted gradient pattern consistent with velocities seen in massive dark matter halos and similar to kinematic patterns of inflowing gas seen in hydrodynamical simulations. Using the kinematics of both resolved $rm Lyalpha$ emission and absorption, we can confirm that both kinematic structures are associated with accretion. Combining the KCWI data with molecular gas observations with Atacama Large Millimeter/submillimeter Array (ALMA) and high spatial resolution of ionized gas with Keck OSIRIS, we find that both quasar host galaxies reside in proto-group environments at $z=2$. We estimate $1-6times10^{10}$M$_odot$ of warm-ionized gas within 30-50 kpc from the quasar that is likely accreting onto the galaxy group. We estimate inflow rates of 60-200 M$_odot$yr$^{-1}$, within an order of magnitude of the outflow rates in these systems. In the 4C 09.17 system, we detect narrow gas streams associated with satellite galaxies, potentially reminiscent of ram-pressure stripping seen in local galaxy groups and clusters. We find that the quasar host galaxies reside in dynamically complex environments, with ongoing mergers, gas accretion, ISM stripping, and outflows likely playing an important role in shaping the assembly and evolution of massive galaxies at cosmic noon." @default.
- W4313265354 created "2023-01-06" @default.
- W4313265354 creator A5023846497 @default.
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- W4313265354 creator A5062742011 @default.
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- W4313265354 date "2022-12-16" @default.
- W4313265354 modified "2023-10-16" @default.
- W4313265354 title "Cold mode gas accretion on two galaxy groups at z ∼ 2" @default.
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- W4313265354 doi "https://doi.org/10.1093/mnras/stac3537" @default.
- W4313265354 hasPublicationYear "2022" @default.