Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies
Journal article, 2022
The 2 mm Mapping Obscuration to Reionization with ALMA (MORA) Survey was designed to detect high-redshift (z greater than or similar to 4), massive, dusty star-forming galaxies (DSFGs). Here we present two likely high-redshift sources, identified in the survey, whose physical characteristics are consistent with a class of optical/near-infrared (OIR)-invisible DSFGs found elsewhere in the literature. We first perform a rigorous analysis of all available photometric data to fit spectral energy distributions and estimate redshifts before deriving physical properties based on our findings. Our results suggest the two galaxies, called MORA-5 and MORA-9, represent two extremes of the "OIR-dark" class of DSFGs. MORA-5 (z(phot) = 4.3(-1.3)(+1.5)) is a significantly more active starburst with a star formation rate (SFR) of 830(-190)(+340) M-circle dot yr(-1) compared to MORA-9 (z(phot) = 4.3(-1.0)(+1.3)), whose SFR is a modest 200(-60)(+250) M-circle dot yr(-1). Based on the stellar masses (M-star approximate to 10(10-11) M-circle dot), space density (n similar to (5 +/- 2) x 10(-6) Mpc(-3), which incorporates two other spectroscopically confirmed OIR-dark DSFGs in the MORA sample at z = 4.6 and z = 5.9), and gas depletion timescales (<1 Gyr) of these sources, we find evidence supporting the theory that OIR-dark DSFGs are the progenitors of recently discovered 3 < z < 4 massive quiescent galaxies.
Author
Sinclaire M. Manning
University of Texas
University of Massachusetts
Caitlin M. Casey
University of Texas
Jorge A. Zavala
University of Texas
National Astronomical Observatory of Japan
Georgios E. Magdis
Technical University of Denmark (DTU)
University of Copenhagen
Patrick M. Drew
University of Texas
Jaclyn B. Champagne
University of Texas
Manuel Aravena
Diego Portales University
Matthieu Bethermin
Aix Marseille University
David L. Clements
Imperial College London
Steven L. Finkelstein
University of Texas
Seiji Fujimoto
University of Copenhagen
Christopher C. Hayward
Flatiron Institute
Jacqueline A. Hodge
Leiden University
Olivier Ilbert
Aix Marseille University
Jeyhan S. Kartaltepe
Rochester Institute of Technology
Kirsten Kraiberg Knudsen
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Anton M. Koekemoer
Space Telescope Science Institute (STScI)
Allison W. S. Man
Dunlap Institute for Astronomy and Astrophysics
University of British Columbia (UBC)
David B. Sanders
University of Hawaii
Kartik Sheth
National Aeronautics and Space Administration (NASA)
Justin S. Spilker
University of Texas
Johannes Staguhn
Johns Hopkins University
National Aeronautics and Space Administration (NASA)
Margherita Talia
Istituto nazionale di astrofisica (INAF)
University of Bologna
Ezequiel Treister
Pontificia Universidad Catolica de Chile
Min S. Yun
University of Massachusetts
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 925 1 23Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Other Physics Topics
Probability Theory and Statistics
DOI
10.3847/1538-4357/ac366a