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

Ma, Jingzhe; Cooray, Asantha; Nayyeri, Hooshang; Ghotbi, Noah; Ivison, Rob; Brown, Arianna; Oteo, Ivan; Duivenvoorden, Steven; Greenslade, Joshua; Clements, David; Wardlow, Julie; Battisti, Andrew; da Cunha, Elisabete; Ashby, Matthew L.N.; Perez-Fournon, Ismael; Riechers, Dominik; Oliver, Seb; Eales, Stephen; Negrello, Mattia; Dye, Simon; Dunne, Loretta; Omont, Alain; Scott, Douglas; Cox, Pierre; Serjeant, Stephen; Maddox, Steve; Valiante, Elisabetta


Jingzhe Ma

Asantha Cooray

Hooshang Nayyeri

Noah Ghotbi

Rob Ivison

Arianna Brown

Ivan Oteo

Steven Duivenvoorden

Joshua Greenslade

David Clements

Julie Wardlow

Andrew Battisti

Elisabete da Cunha

Matthew L.N. Ashby

Ismael Perez-Fournon

Dominik Riechers

Seb Oliver

Stephen Eales

Mattia Negrello

Associate Professor

Loretta Dunne

Alain Omont

Douglas Scott

Pierre Cox

Stephen Serjeant

Steve Maddox

Elisabetta Valiante


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, 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 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 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 × 10^11 Msol ,star formation rate (SFR) of 730 M yr−1 , total dust luminosity of 9.0 × 10^12 Lsol ,dust mass of 2.8 × 10^9 Msol , 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 densityestimates, 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 therarer, intrinsically most dusty, luminous and massive galaxies in the early universe that will help usunderstand the physical drivers of extreme star formation.


Ma, J., Cooray, A., Nayyeri, H., Ghotbi, N., Ivison, R., Brown, A., …Valiante, E. (2019). Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies. Astrophysical Journal Supplement, 244(2), 1-19.

Journal Article Type Article
Acceptance Date Aug 20, 2019
Online Publication Date Oct 4, 2019
Publication Date Oct 4, 2019
Deposit Date Oct 29, 2019
Publicly Available Date Oct 5, 2020
Journal ApJS
Print ISSN 1538-4365
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 244
Issue 2
Article Number 30
Pages 1-19
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL
Publisher URL
Additional Information Journal title: The Astrophysical Journal Supplement Series; Article type: paper; Article title: Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies; Copyright information: © 2019. The American Astronomical Society. All rights reserved.; Date received: 2019-06-17; Date accepted: 2019-08-20; Online publication date: 2019-10-04


Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies (3.1 Mb)

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