Skip to Main content Skip to Navigation
Journal articles

Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies

Abstract : The 2 mm Mapping Obscuration to Reionization with ALMA (MORA) Survey was designed to detect high-redshift (z ≳ 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 ( ${z}_{\mathrm{phot}}={4.3}_{-1.3}^{+1.5}$ ) is a significantly more active starburst with a star formation rate (SFR) of ${830}_{-190}^{+340}$ M yr-1 compared to MORA-9 ( ${z}_{\mathrm{phot}}={4.3}_{-1.0}^{+1.3}$ ), whose SFR is a modest ${200}_{-60}^{+250}$ M yr-1. Based on the stellar masses (M ≍ 1010-11 M ), space density (n ~ (5 ± 2) × 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.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03667484
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, May 13, 2022 - 2:06:50 PM
Last modification on : Saturday, June 25, 2022 - 3:17:12 AM

File

Manning_2022_ApJ_925_23.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Sinclaire M. Manning, Caitlin M. Casey, Jorge A. Zavala, Georgios E. Magdis, Patrick M. Drew, et al.. Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies. The Astrophysical Journal, 2022, 925, ⟨10.3847/1538-4357/ac366a⟩. ⟨insu-03667484⟩

Share

Metrics

Record views

5

Files downloads

2