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

Abstract

The 2mm Mapping Obscuration to Reionization with ALMA (MORA) Survey was designed to detect high redshift ($z\gtrsim 4$), 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 of 830${}_{-190}^{+340}$M${}_{\odot }$yr${}^{-1}$ compared to MORA-9 ($z_{\mathrm{phot}}=4.3_{-1.0}^{+1.3}$) whose star-formation rate is a modest 200${}_{-60}^{+250}$M${}_{\odot }$yr${}^{-1}$. Based on the stellar masses (M${}_{\star }\approx 10^{10-11}$M${}_{\odot }$), space density ($n\sim (5\pm 2)\times 10^{-6}$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.

18 pages, 7 figures, accepted for publication in ApJ

References in corpus (29)

• Cosmic Star Formation History
• The Cosmic Evolution Survey (COSMOS) -- Overview
• EAZY: A Fast, Public Photometric Redshift Code
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• The effect of galaxy mass ratio on merger--driven starbursts
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• The VLA-COSMOS Survey: II. Source Catalog of the Large Project
• Galaxy growth in a massive halo in the first billion years of cosmic history
• Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• Star formation relations and CO SLEDs across the J-ladder and redshift
• The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees
• Exploring the z=3-4 massive galaxy population with ZFOURGE: the prevalence of dusty and quiescent galaxies
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• Physical Characterization of an Unlensed Dusty Star-Forming Galaxy at $z=5.85$
• Mapping Obscuration to Reionization with ALMA (MORA): 2mm Efficiently Selects the Highest-Redshift Obscured Galaxies
• An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
• Illuminating the dark side of cosmic star formation two billion years after the Big Bang
• The redshift distribution of submillimetre galaxies at different wavelengths
• The redshift and star formation mode of AzTEC2: a pair of massive galaxies at $z=4.63$
• Far-Infrared Photometric Redshifts: A New Approach to a Highly Uncertain Enterprise
• A complete distribution of redshifts for sub-millimetre galaxies in the SCUBA-2 Cosmology Legacy Survey UDS field
• SMM J04135+10277: A distant QSO-starburst system caught by ALMA
• On the frequency of star-forming galaxies in the vicinity of powerful AGNs: The case of SMM J04135+10277
• A tentative emission line at z=5.8 from a 3mm-selected galaxy

Cited by in corpus (24)

• An Atlas of Color-selected Quiescent Galaxies at $z>3$ in Public $JWST$ Fields
• COSMOS2020: The Galaxy Stellar Mass Function: the assembly and star formation cessation of galaxies at $0.2<z\le 7.5$
• CEERS Key Paper V: A triality on the nature of HST-dark galaxies
• Unveiling the Nature of Infrared Bright, Optically Dark Galaxies with Early JWST Data
• RUBIES: a complete census of the bright and red distant Universe with JWST/NIRSpec
• JWST reveals a population of ultra-red, flattened disk galaxies at 2<z<6 previously missed by HST
• Dual constraints with ALMA: new [O III] 88 $\mu$m and dust-continuum observations reveal the ISM conditions of luminous LBGs at $z\sim 7$
• ALMA Lensing Cluster Survey: $HST$ and $Spitzer$ Photometry of 33 Lensed Fields Built with CHArGE
• A new estimate of the cosmic star formation density from a radio-selected sample, and the contribution of $H$-dark galaxies at $z\ge 3$
• An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS field (AS2COSPEC): Survey Description and First Results
• The LOFAR Two-metre Sky Survey: the radio view of the cosmic star formation history
• Unveiling the hidden universe with JWST: The contribution of dust-obscured galaxies to the stellar mass function at $z\sim 3-8$
• Sub-Millimetre Galaxies with Webb: Near-Infrared Counterparts and Multi-wavelength Morphology
• JWST CEERS probes the role of stellar mass and morphology in obscuring galaxies
• $JWST$ Insight Into a Lensed $HST$-dark Galaxy and its Quiescent Companion at $z=2.58$
• Broad emission lines in optical spectra of hot dust-obscured galaxies can contribute significantly to JWST/NIRCam photometry
• Missing Giants: Predictions on Dust-Obscured Galaxy Stellar Mass Assembly Throughout Cosmic Time
• Illuminating the Dark Side of Cosmic Star Formation III: Building the largest homogeneous sample of Radio-Selected Dusty Star-Forming Galaxies in COSMOS with PhoEBO
• JADES Ultra-red Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations
• "Dust Giant": Extended and Clumpy Star-Formation in a Massive Dusty Galaxy at $z=1.38$
• Simultaneously Modelling Dusty Star Forming Galaxies and Massive Quiescents: A Calibration Framework for Galaxy Formation Models
• Unveiling the Dark Side of UV/Optical Bright Galaxies: Optically Thick Dust Absorption
• Searching Far and Long I: Pilot ALMA 2mm Follow-up of Bright Dusty Galaxies as a Redshift Filter
• Improving Optical Photo-z Constraints for Dusty Star-forming Galaxies Using Submillimeter-based Priors