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- W4280492318 abstract "Reservoirs of dense atomic gas (primarily hydrogen), contain approximately 90 percent of the neutral gas at a redshift of 3, and contribute to 2-3 percent of the total baryons in the Universe. These damped Lyman-${alpha}$ systems (so called because they absorb Lyman-${alpha}$ photons from within and from background sources) have been studied for decades, but only through absorption lines present in the spectra of background quasars and gamma-ray bursts. Such pencil beams do not constrain the physical extent of the systems. Here, we report integral-field spectroscopy of a bright, gravitationally lensed galaxy at a redshift of 2.7 with two foreground damped Lyman-${alpha}$ systems. These systems are $>$ 238 $kpc^2$ in extent, with column densities of neutral hydrogen varying by more than an order of magnitude on $<$ 3 kpc-scales. The mean column densities are $10^{20.46}$ - $10^{20.84} cm^{-2}$ and the total masses are $> 5.5 times 10^{8}$ - $1.4 times 10^{9} M_{odot}$, showing that they contain the necessary fuel for the next generation of star formation, consistent with relatively massive, low-luminosity primeval galaxies at redshifts $>$ 2." @default.
- W4280492318 created "2022-05-22" @default.
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- W4280492318 date "2022-05-18" @default.
- W4280492318 modified "2023-10-18" @default.
- W4280492318 title "Resolving the H i in damped Lyman α systems that power star formation" @default.
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- W4280492318 doi "https://doi.org/10.1038/s41586-022-04616-1" @default.
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