The early Universe was dust-rich and extremely hot
Abstract
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 8, indicating abundant dust in the early Universe. We further find an increase of dust temperature with redshift, reaching 100 ± 12 K at z ∼ 7, 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 are located at https://github.com/marcoviero/simstack3/.
Additional Information
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) The authors are grateful to the referee for their careful reading and constructive suggestions, thank you. 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 https://github.com/marcoviero/simstack3/tree/main/viero2022/ and at the DOI: https://doi.org/10.5281/zenodo.6792395.Attached Files
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Additional details
- Eprint ID
- 119822
- Resolver ID
- CaltechAUTHORS:20230307-205876300.9
- Canadian Institute for Theoretical Astrophysics
- David Dunlap Family
- University of Toronto
- Created
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2023-05-18Created from EPrint's datestamp field
- Updated
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2023-05-18Created from EPrint's last_modified field