Spitzer catalog of Herschel-selected ultrared dusty, star-forming galaxies
Jingzhe Ma, Asantha Cooray, Hooshang Nayyeri, Arianna Brown, Noah, Ghotbi, Rob Ivison, Ivan Oteo, Steven Duivenvoorden, Joshua Greenslade, David, Clements, Julie Wardlow, Andrew Battisti, Elisabete da Cunha, Matthew L. N., Ashby, Ismael Perez-Fournon, Dominik Riechers

TL;DR
This study presents a detailed analysis of 300 Herschel-selected ultrared dusty star-forming galaxies using Spitzer follow-up, high-resolution ALMA, NOEMA, and SMA data to understand their properties and role in early universe galaxy evolution.
Contribution
It provides the first large-scale multi-wavelength characterization of ultrared DSFGs, revealing their physical properties and their distinction from typical $z \,\sim\,$ 2 DSFGs.
Findings
Median redshift of 3.3 for ultrared DSFGs
Ultrared DSFGs are more massive and luminous than typical $z\sim2$ DSFGs
Most ultrared DSFGs are unlensed and have complex structures.
Abstract
The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of "ultrared" dusty, star-forming galaxies (DSFGs) with rising SPIRE flux densities (; so-called "500 m-risers") as an efficient way for identifying DSFGs at higher redshift (). In this paper, we present a large Spitzer follow-up program of 300 Herschel ultrared DSFGs. We have obtained high-resolution ALMA, NOEMA, and SMA data for 63 of them, which allow us to securely identify the Spitzer/IRAC counterparts and classify them as gravitationally lensed or unlensed. Within the 63 ultrared sources with high-resolution data, 65% appear to be unlensed, and 27% are resolved into multiple components. We focus on analyzing the unlensed sample by directly performing multi-wavelength spectral energy distribution (SED) modeling to derive their physical…
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