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The CGM at Cosmic Noon with KCWI: Outflows from a Star-forming Galaxy at z=2.071 by Nielsen, Nikole M.; Kacprzak, Glenn G.; Pointon, Stephanie K.; Murphy, Michael T.; Churchill, Christopher W.; Davé, Romeel is a scholarly article available to read on EtoBox.

What is The CGM at Cosmic Noon with KCWI: Outflows from a Star-forming Galaxy at z=2.071 about?

We present the first results from our CGM at Cosmic Noon with KCWI program to study gas flows in the circumgalactic medium (CGM) at $z=2-3$. Combining the power of a high-resolution VLT/UVES quasar spectrum, an HST/ACS image, and integral field spectroscopy with Keck/KCWI, we detected Lya emission from a $1.7L_{\ast}$ galaxy at $z_{\rm gal}=2.0711$ associated with a Lyman limit system with weak MgII ($W_r(2796)=0.24$ Ang) in quasar field J143040$+$014939. The galaxy is star-forming (${\rm SFR}_{\rm FUV}=37.8$ M$_{\odot}$ yr$^{-1}$) and clumpy: either an edge-on disk ($i=85^{\circ}$) or, less likely, a major merger. The background quasar probes the galaxy at an impact parameter of $D=66$ kpc along the projected galaxy minor axis ($\Phi=89^{\circ}$). From photoionization modeling of the absorption system, we infer a total line-of-sight CGM metallicity of ${\rm [Si/H]}=-1.5^{+0.4}_{-0.3}$. The absorption system is roughly kinematically symmetric about $z_{\rm gal}$, with a full MgII velocity spread of $\sim210$ km s$^{-1}$. Given the galaxy-quasar orientation, CGM metallicity, and gas kinematics, we interpret this gas as an outflow that has likely swept-up additional material. By mode

Author

Nielsen, Nikole M.; Kacprzak, Glenn G.; Pointon, Stephanie K.; Murphy, Michael T.; Churchill, Christopher W.; Davé, Romeel

Published

2020

Language

EN