Spatially resolved dust properties over 50 kpc in a hyperluminous galaxy merger at $z = 4.6$

• DOI: 10.48550/arxiv.2502.10503
• Publication Date: 2025-02-14
• Authors: Román Fernández A...; T. Díaz-Santos; E. Hatziminaoglou; M. Aravena; Daniel Stern; L. Armus; Roberto J. Assef; A. W. Blain; V. Charmandaris; Roberto Decarli; Peter Eisenhardt; Carl Ferkinhoff; Jorge González-López; Hyunsung D. Jun; Guodong Li; Mai Liao; Victoria Shevill; Devika Shobhana; Chao‐Wei Tsai; Andrey Vayner; Jingwen Wu; Dejene Zewdie
• Keywords: Astrophysics of Galaxies (astro-ph.GA); FOS: Physical sciences; Astrophysics - Astrophysics of Galaxies

We present spatially resolved dust-continuum ALMA observations from rest-frame $\sim$60 to $\sim$600 $\mu$m (bands 3-10) of the hyperluminous hot dust-obscured galaxy (hot DOG) WISE J224607.6-052634.9 (W2246-0526), at redshift $z=4.6$. W2246-0526 is interacting with least three companion galaxies, forming a system connected by tidal streams. model multiwavelength dust continuum using modified blackbody, which we derive properties (mass, emissivity index, area emitting region, and temperature) in DOG structures across region nearly $\sim$50 kpc. The peak temperature location DOG, $\sim$110 K, likely consequence heating central quasar. drops $\sim$40 K radius $\sim$8 kpc, suggesting that quasar beyond distance nondominant. connecting streams between host galaxies temperatures 30-40 typical starburst it most heated recent, in-situ star formation. This first time are over several tens kpc Cosmic Noon --this more than six times scales previously probed those redshifts.