@article{82cc5bd59a7642f3a1f0d8b67ba891ae,
title = "A [C ii] 158 μm emitter associated with an O i absorber at the end of the reionization epoch",
abstract = "The physical and chemical properties of the circumgalactic medium at z ≳ 6 have been studied successfully through the absorption in the spectra of background quasi-stellar objects1–3. One of the most crucial questions is to investigate the nature and location of the source galaxies that give rise to these early metal absorbers4–6. Theoretical models suggest that momentum-driven outflows from typical star-forming galaxies can eject metals into the circumgalactic medium and the intergalactic medium at z = 5–6 (refs. 7–9). Deep, dedicated surveys have searched for Lyα emission associated with strong C iv absorbers at z ≈ 6, but only a few Lyα-emitter candidates have been detected. Interpreting these detections is moreover ambiguous because Lyα is a resonant line10–12, raising the need for complementary techniques for detecting absorbers{\textquoteright} host galaxies. Here we report a [C ii] 158 μm emitter detected using the Atacama Large Millimeter Array that is associated with a strong low-ionization absorber, O i, at z = 5.978. The projected impact parameter between O i and [C ii] emitter is 20.0 kpc. The measured [C ii] luminosity is 7.0 × 107 solar luminosities. Further analysis indicates that strong O i absorbers may reside in the circumgalactic medium of massive halos one to two orders of magnitude more massive than expected values8,14.",
author = "Yunjing Wu and Zheng Cai and Marcel Neeleman and Kristian Finlator and Shiwu Zhang and Prochaska, {J. Xavier} and Ran Wang and Emonts, {Bjorn H.C.} and Xiaohui Fan and Keating, {Laura C.} and Feige Wang and Jinyi Yang and Hennawi, {Joseph F.} and Junxian Wang",
note = "Funding Information: Z.C. and Y.W. are supported by the National Key R&D Program of China (grant no. 2018YFA0404503) and the National Science Foundation of China (grant no. 12073014). M.N. acknowledges support from European Research Council advanced grant no. 740246 (Cosmic_Gas). F.W. is thankful for support provided by NASA through the NASA Hubble Fellowship grant no. HST-HF2-51448.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. J.Y. is a Strittmatter Fellow in Steward Observatory, University of Arizona. The F125W and F160W HST observations in the QSO J2054 field were conducted in the HST program (Proposal ID: 15064). We appreciate the principal investigator Caitlin Casey and the team of this program for collecting these data in Cycle 25. Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer Nature Limited.",
year = "2021",
month = nov,
doi = "10.1038/s41550-021-01471-4",
language = "English (US)",
volume = "5",
pages = "1110--1117",
journal = "Nature Astronomy",
issn = "2397-3366",
publisher = "Nature Publishing Group",
number = "11",
}