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

Understand

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 at least three companion galaxies, forming a system connected by tidal streams.
• We model the multiwavelength ALMA observations of the dust continuum using a modified blackbody, from which we derive the dust properties (mass, emissivity index, area of the emitting region, and temperature) in the hot DOG and resolved structures across a region of nearly $\sim$50 kpc.
• The peak temperature at the location of the hot DOG, $\sim$110 K, is likely the consequence of heating by the central quasar.