The Molecular Gas Reservoirs of $z\sim 2$ Galaxies: A comparison of CO(1-0) and dust-based molecular gas masses

Abstract

We test the use of long-wavelength dust continuum emission as a molecular gas tracer at high redshift, via a unique sample of 12, z~2 galaxies with observations of both the dust continuum and CO(1-0) line emission (obtained with the Atacama Large Millimeter Array and Karl G. Jansky Very Large Array, respectively). Our work is motivated by recent, high redshift studies that measure molecular gas masses (\ensuremath{\rm{M}_{\rm{mol}}}) via a calibration of the rest-frame $850\mu$m luminosity ($L_{850\mu \mathrm{m},\mathrm{rest}}$) against the CO(1-0)-derived \ensuremath{\rm{M}_{\rm{mol}}}\ of star-forming galaxies. We hereby test whether this method is valid for the types of high-redshift, star-forming galaxies to which it has been applied. We recover a clear correlation between the rest-frame $850\mu$m luminosity, inferred from the single-band, long-wavelength flux, and the CO(1-0) line luminosity, consistent with the samples used to perform the $850\mu$m calibration. The molecular gas masses, derived from $L_{850\mu \mathrm{m},\mathrm{rest}}$, agree to within a factor of two with those derived from CO(1-0). We show that this factor of two uncertainty can arise from the values of the dust emissivity index and temperature that need to be assumed in order to extrapolate from the observed frequency to the rest-frame at 850$\mu \mathrm{m}$. The extrapolation to 850$\mu \mathrm{m}$ therefore has a smaller effect on the accuracy of \Mmol\ derived via single-band dust-continuum observations than the assumed CO(1-0)-to-\ensuremath{\rm{M}_{\rm{mol}}}\ conversion factor. We therefore conclude that single-band observations of long-wavelength dust emission can be used to reliably constrain the molecular gas masses of massive, star-forming galaxies at $z\gtrsim 2$.

References in corpus (65)

• Galactic Stellar and Substellar Initial Mass Function
• Cosmic Star Formation History
• The Herschel-SPIRE instrument and its in-flight performance
• The CO-to-H2 Conversion Factor
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• GOODS-Herschel: an infrared main sequence for star-forming galaxies
• Cool Gas in High Redshift Galaxies
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• High molecular gas fractions in normal massive star forming galaxies in the young Universe
• Measuring and Modelling the Redshift Evolution of Clustering: the Hubble Deep Field North
• A Study of the Gas-Star Formation Relation over Cosmic Time
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• Very High Gas Fractions and Extended Gas Reservoirs in z=1.5 Disk Galaxies
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• Different star formation laws for disks versus starbursts at low and high redshifts
• The Dark Molecular Gas
• The Relationship Between Gas Content and Star Formation in Molecule-Rich Spiral Galaxies
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• The Atacama Large Millimeter/submillimeter Array
• PACS Evolutionary Probe (PEP) - A Herschel Key Program
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
• Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
• Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA
• The Evolution of ISM Mass Probed by Dust Emission -- ALMA Observations at z = 0.3 to 2
• A Turnover in the Galaxy Main Sequence of Star Formation at $M_{\ast }\sim 10^{10}{M}_{\odot }$ for Redshifts $z<1.3$
• The dust content of galaxies from z = 0 to z = 9
• The molecular gas in Luminous Infrared Galaxies I: CO lines, extreme physical conditions, and their drivers
• Radio-to-FIR Spectral Energy Distribution and Photometric Redshifts for Dusty Starburst Galaxies
• Modeling CO Emission: I. CO as a Column Density Tracer and the X-Factor in Molecular Clouds
• CO(1-0) in z>2 Quasar Host Galaxies: No Evidence for Extended Molecular Gas Reservoirs
• On the dust temperatures of high redshift galaxies
• Luminous Infrared Galaxies with the Submillimeter Array: II. Comparing the CO(3-2) Sizes and Luminosities of Local and High-Redshift Luminous Infrared Galaxies
• Molecular line intensities as measures of cloud masses - I. Sensitivity of CO emissions to physical parameter variations
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular gas reservoirs in high-redshift galaxies
• The X-factor in Galaxies: I. Dependence on Environment and Scale
• Dust continuum emission as a tracer of gas mass in galaxies
• Gas Fraction and Depletion Time of Massive Star Forming Galaxies at z~3.2: No Change in Global Star Formation Process out to z>3
• The CO Luminosity Density at High-z (COLDz) Survey: A Sensitive, Large Area Blind Search for Low-J CO Emission from Cold Gas in the Early Universe with the Karl G. Jansky Very Large Array
• Molecular gas content in strongly-lensed z~1.5-3 star-forming galaxies with low IR luminosities
• Can dust emission be used to map the interstellar medium in high-redshift galaxies? Results from the Herschel Reference Survey
• CO J=1-0 spectroscopy of four submillimeter galaxies with the Zpectrometer on the Green Bank Telescope
• An Extragalactic 12CO J=3-2 survey with the Heinrich-Hertz-Telescope
• CO(1-0) line imaging of massive star-forming disc galaxies at z=1.5-2.2
• An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
• A Total Molecular Gas Mass Census in z~2-3 Star-forming Galaxies: Low-J CO Excitation Probes of Galaxies' Evolutionary States
• Multi-Wavelength SEDs of Herschel Selected Galaxies in the COSMOS Field
• Total Molecular Gas Masses of z~3 Lyman-Break Galaxies: CO(1-0) Emission in MS1512-cB58 and the Cosmic Eye
• High Resolution Imaging of PHIBSS z~2 Main Sequence Galaxies in CO J=1-0
• CO(1-0) detection of molecular gas in the massive Spiderweb Galaxy (z=2)
• VALES: III. The calibration between the dust continuum and interstellar gas content of star-forming galaxies
• Submillimeter flux as a probe of molecular ISM mass in high-$z$ galaxies
• Total Molecular Gas Masses of Planck - Herschel Selected Strongly Lensed Hyper Luminous Infrared Galaxies
• Empirical predictions for (sub-)millimeter line and continuum deep fields
• Herschel-ATLAS: Correlations between Dust and Gas in Local Submm-Selected Galaxies
• Similar Scaling Relations for the Gas Content of Galaxies across Environments to z ~ 3.5
• The AT-LESS CO(1-0) survey of submillimetre galaxies in the Extended Chandra Deep Field South: First results on cold molecular gas in galaxies at z ~ 2

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• Measurements of the dust properties in z~1-3 SMGs with ALMA
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• A${}^3$COSMOS: A census on the molecular gas mass and extent of main-sequence galaxies across cosmic time
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• The ALPINE-ALMA [CII] survey: Dust mass budget in the early Universe
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• Dust continuum, CO, and [C I] 1-0 lines: self-consistent H2 mass estimates and the possibility of globally CO-dark galaxies at $z=0.35$
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• An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS Field (AS2COSPEC): Physical Properties of z=2-5 Ultra- and Hyperluminous Infrared Galaxies
• Early Science with the Large Millimeter Telescope: Constraining the Gas Fraction of a Compact Quiescent Galaxy at z=1.883
• The dust-to-gas mass ratio of luminous galaxies as a function of their metallicity at cosmic noon
• Significant Molecular Gas Deficiencies in Star-forming Cluster Galaxies at $z\sim 1.4$
• The ALMA-CRISTAL survey: Resolved kinematic studies of main sequence star-forming galaxies at 4<z<6
• The nature of H{\sc i}-absorption-selected galaxies at $z\approx 4$
• Cosmic evolution of the H2 mass density and the epoch of molecular gas
• Morphological Evolution of the Hosts of Far-Infrared/Submillimeter Galaxies
• An Orientation Bias in Observations of Submillimetre Galaxies
• COALAS III: The ATCA CO(1-0) look at the growth and death of H$\alpha$ emitters in the Spiderweb protocluster at z=2.16
• COSMOS2020: Investigating the AGN-obscured accretion phase at $z\sim 1$ via [NeV] selection
• CO Excitation and Line Energy Distributions in Gas-selected Galaxies
• JWST PRIMER: A deep JWST study of all ALMA-detected galaxies in PRIMER COSMOS -- dust-obscured star-formation history back to z $\simeq$ 7
• Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6
• Molecular gas content and high excitation of a massive main-sequence galaxy at z = 3
• Measuring the gas reservoirs in $10^8<$ M${}_{\star }<10^{11}$ M${}_{\odot }$ galaxies at $1\le z\le 3$
• Tight correlation of star formation with [Ci] and CO lines across cosmic time
• Noema formIng Cluster survEy (NICE): A Census of Star Formation and Cold Gas Properties in Massive protoclusters at 1.5<z<4
• Observed cosmic evolution of galaxy dust properties with metallicity and tensions with models