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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646416" target="_blank" >RIV/67985815:90106/25:00646416 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1051/0004-6361/202453214" target="_blank" >https://doi.org/10.1051/0004-6361/202453214</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202453214" target="_blank" >10.1051/0004-6361/202453214</a>

Result language

angličtina

Original language name

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

Original language description

We present spatially resolved dust-continuum ALMA observations from rest frame similar to 60 to similar to 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 in resolved structures across a region of nearly similar to 50 kpc. The peak temperature at the location of the hot DOG, similar to 110 K, is likely the consequence of heating by the central quasar. The dust temperature drops to similar to 40 K at a radius of similar to 8 kpc, suggesting that heating by the quasar beyond that distance is non-dominant. The dust in the connecting streams between the host and companion galaxies is at temperatures between 30 and 40 K, typical of starburst galaxies, suggesting it is most likely heated by recent in situ star formation. This is the first time that dust properties have been spatially resolved over several tens of kiloparsec in a galaxy system beyond Cosmic Noon, this is more than six times the scales previously probed in galaxies at these redshifts.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

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Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

695

Issue of the periodical within the volume

March

Country of publishing house

FR - FRANCE

Number of pages

7

Pages from-to

L15

UT code for WoS article

001447060600001

EID of the result in the Scopus database

2-s2.0-105000252415