Three Lyman-α-emitting filaments converging to a massive galaxy group at z = 2.91: discussing the case for cold gas infall

2020/06/30 by E. Daddi, F. Valentino, R. M. Rich +23
Physics and Astronomy · #Accretion (finance) #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Cold dark matter #Dark galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Halo #Millimeter #Nebula #Star formation #Submillimeter Array #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.1051/0004-6361/202038700

20 pages, 12 figures, 3 tables. Accepted for publication in A&A

arxiv created 2021/02/22 · openalex publication_date 2021/02/26 · openalex created_date 2021/03/01 · arxiv updated 2021/05/26 · openalex updated_date 2026/08/05

Abstract

We have discovered a 300 kpc-wide giant Lyman- α (Ly α ) nebula centered on the massive galaxy group RO-1001 at z = 2.91 in the Cosmic Evolution Survey field. Keck Cosmic Web Imager observations reveal three cold gas filaments converging into the center of the potential well of its ∼4 × 10 13 M ⊙ dark matter halo, hosting 1200 M ⊙ yr −1 of star formation as probed by Atacama Large Millimeter Array and NOrthern Extended Millimeter Array observations. The nebula morphological and kinematics properties and the prevalence of blueshifted components in the Ly α spectra are consistent with a scenario of gas accretion. The upper limits on active galactic nuclei activity and overall energetics favor gravity as the primary Ly α powering source and infall as the main source of gas flows to the system. Although interpretational difficulties remain, with outflows and likely also photoionization with ensuing recombination still playing a role, this finding provides arguably an ideal environment to quantitatively test models of cold gas accretion and galaxy feeding inside an actively star-forming massive halo at high redshift.

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