Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies

Jingzhe Ma, Asantha Cooray, H. Nayyeri, Arianna Brown, Noah Ghotbi, R J Ivison, Ivan Oteo, Steven Duivenvoorden, Joshua Greenslade, David Clements, Andrew Battisti, Elisabete Lima da Cunha

    Research output: Contribution to journalArticlepeer-review

    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 (S500 > S350 > S250; the so-called “500 μm risers”) as an efficient way for identifying DSFGs at higher redshift (z > 4). In this paper, we present a large Spitzer followup program of 300 Herschel ultrared DSFGs. We have obtained high-resolution Atacama Large Millimeter/ submillimeter Array, Northern Extended Millimeter Array, 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 multiwavelength spectral energy distribution modeling to derive their physical properties and compare with the more numerous z ∼ 2 DSFG population. The ultrared sample has a median redshift of 3.3, stellar mass of 3.7 × 1011 Me, star formation rate (SFR) of 730 Me yr−1 , total dust luminosity of 9.0 × 1012 Le, dust mass of 2.8 × 109 Me, and V-band extinction of 4.0, which are all higher than those of the ALESS DSFGs. Based on the space density, SFR density, and stellar mass density estimates, we conclude that our ultrared sample cannot account for the majority of the star-forming progenitors of the massive, quiescent galaxies found in infrared surveys. Our sample contains the rarer, intrinsically most dusty, luminous, and massive galaxies in the early universe that will help us understand the physical drivers of extreme star formation.
    Original languageEnglish
    JournalAstrophysical Journal Supplement Series
    Volume244
    Issue number2
    DOIs
    Publication statusPublished - 2019

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