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The Early Universe was Dust-Rich and Extremely Hot

Viero, Marco P. and Sun, Guochao and Chung, Dongwoo T. and Moncelsi, Lorenzo and Condon, Sam S. (2022) The Early Universe was Dust-Rich and Extremely Hot. . (Unpublished)

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We investigate the dust properties and star-formation signature of galaxies in the early universe by stacking 111,227 objects in the recently released COSMOS catalogue on maps at wavelengths bracketing the peak of warmed dust emission. We find an elevated far-infrared luminosity density to redshift 10, indicating abundant dust in the early universe. We further find an increase of dust temperature with redshift, reaching ~ 119 +- 7 K at z ~ 9, suggesting either the presence of silicate rich dust originating from Population II stars, or sources of heating beyond simply young hot stars. Lastly, we try to understand how these objects have been missed in previous surveys, and how to design observations to target them. All code, links to the data, and instructions to reproduce this research in full is located at this https URL

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper ItemAll code, links to the data, and instructions to reproduce this research
Viero, Marco P.0000-0003-0545-4872
Sun, Guochao0000-0003-4070-497X
Chung, Dongwoo T.0000-0003-2618-6504
Moncelsi, Lorenzo0000-0002-4242-3015
Additional Information:Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). DTC holds a CITA/Dunlap Institute postdoctoral fellowship. The Dunlap Institute is funded through an endowment established by the David Dunlap family and the University of Toronto. The University of Toronto operates on the traditional land of the Huron-Wendat, the Seneca, and most recently, the Mississaugas of the Credit River; DTC is grateful to have the opportunity to work on this land. DATA AVAILABILITY. The simstack package needed to reproduce these results, and Jupyter Notebooks guiding the user through each step, are available at
Funding AgencyGrant Number
Dunlap Institute for Astronomy and AstrophysicsUNSPECIFIED
Canadian Institute for Theoretical AstrophysicsUNSPECIFIED
Subject Keywords:galaxies: star formation — infrared: galaxies — submillimetre: diffuse background — early Universe
Record Number:CaltechAUTHORS:20220712-193842317
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115500
Deposited By: George Porter
Deposited On:13 Jul 2022 20:26
Last Modified:13 Jul 2022 20:26

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