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HI Ly$\alpha$ Emission from a Metal-Poor Cool Stream Fueling an Early Dusty Starburst by Hall, Kevin; Fu, Hai is a scholarly article available to read on EtoBox.

What is HI Ly$\alpha$ Emission from a Metal-Poor Cool Stream Fueling an Early Dusty Starburst about?

The GAMA J0913$-$0107 system is a rare conjunction of a submillimeter galaxy (SMG) at $z \approx 2.7$ and two background QSOs with projected separations $<$200 kpc. Previous high-resolution QSO absorption-line spectroscopy has revealed high H $\tiny{\rm I}$ column density, extremely metal-poor ($\sim 1\%$ solar) gas streams in the circumgalactic medium of the SMG. Here we present deep optical integral-field spectroscopy of the system with the Keck Cosmic Web Imager (KCWI). Reaching a $2\sigma$ surface brightness (SB) limit $\approx 10^{-19}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$ with $\sim$2 hours of integration time, we detect a filamentary Ly$\alpha$ nebula stretching $\sim$180 kpc from the SMG intercepting both QSO sightlines. This Ly$\alpha$ filament may correspond to the same cool gas stream penetrating through the hot halo seen in the absorption. In contrast to Ly$\alpha$ nebulae around QSOs, there is no obvious local source for photoionization due to the massive dust content. While uncertain, we consider the possibility that the nebula is ionized by shocks induced by the infall, obscured star formation, and/or a boosted UV background. The SMG-QSOs conjunction multiplied the e

Author

Hall, Kevin; Fu, Hai

Published

2024

Language

EN