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 111227 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/.

References in corpus (20)

• The Cosmic Evolution Survey (COSMOS) -- Overview
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• The Cosmic Infrared Background Resolved by Spitzer. Contributions of Mid-Infrared Galaxies to the Far-Infrared Background
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy
• Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0<z<4
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• Spitzer Deep and Wide Legacy Mid- and Far-Infrared Number Counts and Lower Limits of Cosmic Infrared Background
• ISM properties of a Massive Dusty Star-Forming Galaxy discovered at z ~ 7
• The REBELS ALMA Survey: cosmic dust temperature evolution out to z $\sim$ 7
• Are high redshift Galaxies hot? - Temperature of z > 5 Galaxies and Implications on their Dust Properties
• The ALMA REBELS Survey. Epoch of Reionization giants: properties of dusty galaxies at $z\approx 7$
• ALMA Characterises the Dust Temperature of z ~ 5.5 Star-Forming Galaxies
• Dust production scenarios in galaxies at z ~ 6-8.3
• COMAP Early Science: I. Overview
• The Atacama Large Aperture Submillimetre Telescope (AtLAST)
• CONCERTO at APEX: Installation and first phase of on-sky commissioning
• Have we seen all the galaxies that comprise the cosmic infrared background at 250\,$\mu$m $\le \lambda \le$ 500\,$\mu$m?
• A simple numerical experiment on the dust temperature bias for Lyman break galaxies at $z\gtrsim 5$

Cited by in corpus (1)

• The ALMA View of High-Redshift Galaxy Formation