CHILES X: Molecular and atomic gas at intermediate redshift

Abstract

We present ALMA CO observations of 14 HI-detected galaxies from the CHILES survey found in a cosmic over-density at z~0.12. This is the largest collection of spatially resolved CO + HI observations beyond the local Universe (z>0.05) to date. While the HI-detected parent sample spans a range of stellar masses, star formation rates (SFR), and environments, we only directly detect CO in the highest stellar mass galaxies, log(M_*/M_Sun)>10.0, with SFRs greater than ~2 M_Sun/yr. The detected CO has the kinematic signature of a rotating disk, consistent with the HI. We stack the CO non-detections and find a mean H_2 mass of log(M_H2/M_Sun) = 8.46 in galaxies with a mean stellar mass of log(M_*/M_Sun) = 9.35. In addition to high stellar masses and SFRs, the systems detected in CO are spatially larger, have redder overall colors, and exhibit broader (stacked) line widths. The CO emission is spatially coincident with both the highest stellar mass surface density and star forming region of the galaxies, as revealed by the 1.4 GHz continuum emission. We interpret the redder colors as the molecular gas being coincident with dusty regions of obscured star formation. The 14 HI detections show a range of morphologies, but the HI reservoir is always more extended than the CO. Finally, we compare with samples in the literature and find mild evidence for evolution in the molecular gas reservoir and H_2-to-HI gas ratio with redshift in HI flux-limited samples. We show that the scatter in the HI, and HI-to-stellar mass ratio is too great to conclusively measure evolution below z=0.2, and is even extremely difficult below z=0.4. Detections from CHILES are likely to be the only individual galaxies detected in HI between 0.1<z<0.23 for the foreseeable future due to the severity of satellite radio frequency interference, and its preferential impact on short baselines which dominate contemporary HI surveys.

Accepted for publication in A&A. Abstract abridged for the arxiv submission

References in corpus (93)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Spitzer Space Telescope Mission
• The CO-to-H2 Conversion Factor
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• The Cosmic Evolution Survey (COSMOS) -- Overview
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• THINGS: The HI Nearby Galaxy Survey
• CIGALE: a python Code Investigating GALaxy Emission
• The Circumgalactic Medium
• CASA, the Common Astronomy Software Applications for Radio Astronomy
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• Molecular Gas at High Redshift
• Calibrating Extinction-Free Star Formation Rate Diagnostics with 33GHz Free-Free Emission in NGC6946
• The COSMOS Survey: Hubble Space Telescope / Advanced Camera for Surveys (HST/ACS) Observations and Data Processing
• HERACLES: The HERA CO-Line Extragalactic Survey
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• The Spitzer Legacy Survey of the HST-ACS 2 sq. deg. COSMOS Field: survey strategy and first analysis
• The CO-to-H2 Conversion Factor and Dust-to-Gas Ratio on Kiloparsec Scales in Nearby Galaxies
• The Chandra Deep Field South: Optical Spectroscopy I
• xCOLD GASS: the complete IRAM-30m legacy survey of molecular gas for galaxy evolution studies
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
• The Atlas3D project -- IV: the molecular gas content of early-type galaxies
• xGASS: Total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
• The Cosmic Baryon and Metal Cycles
• Molecular and atomic gas along and across the main sequence of star-forming galaxies
• A Turnover in the Galaxy Main Sequence of Star Formation at $M_{\ast }\sim 10^{10}{M}_{\odot }$ for Redshifts $z<1.3$
• Color--Mass-to-Light Ratio Relations for Disk Galaxies
• The molecular gas in Luminous Infrared Galaxies I: CO lines, extreme physical conditions, and their drivers
• The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies
• The cold interstellar medium of galaxies in the Local Universe
• Fitting AGN/galaxy X-ray-to-radio SEDs with CIGALE and improvement of the code
• Cold gas properties of the Herschel Reference Survey. II. Molecular and total gas scaling relations
• The Constant Average Relationship between Dust-obscured Star Formation and Stellar Mass from $z=0$ to $z=2.5$
• The EDGE-CALIFA Survey: Interferometric Observations of 126 Galaxies with CARMA
• Pixel-based correction for Charge Transfer Inefficiency in the Hubble Space Telescope Advanced Camera for Surveys
• A Redshift Survey of Herschel Far-Infrared Selected Starbursts and Implications for Obscured Star Formation
• SoFiA 2 -- An automated, parallel HI source finding pipeline for the WALLABY survey
• The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
• Galaxy And Mass Assembly: Deconstructing Bimodality - I. Red ones and blue ones
• Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES Detection of a Starbursting Galaxy at z=0.376
• PHIBSS2: survey design and z=0.5-0.8 results. Molecular gas reservoirs during the winding-down of star formation
• A History of HI Stripping in Virgo: A Phase-space View of VIVA Galaxies
• Tracing HI Beyond the Local Universe
• The Cosmic Decline in the H2/HI-Ratio in Galaxies
• BUDHIES III: The fate of HI and the quenching of galaxies in evolving environments
• The zCOSMOS 20k Group Catalog
• Variation of galactic cold gas reservoirs with stellar mass
• The AMIGA sample of isolated galaxies IX. Molecular gas properties
• Star Formation Laws and Efficiencies across 80 Nearby Galaxies
• The ALMA Fornax Cluster Survey I: stirring and stripping of the molecular gas in cluster galaxies
• Star formation scaling relations at ~100 pc from PHANGS: Impact of completeness and spatial scale
• HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
• Neutral hydrogen (HI) gas content of galaxies at $z\approx 0.32$
• Deep Learning of Quasar Spectra to Discover and Characterize Damped Lya Systems
• A Total Molecular Gas Mass Census in z~2-3 Star-forming Galaxies: Low-J CO Excitation Probes of Galaxies' Evolutionary States
• The ALFALFA-SDSS Galaxy Catalog
• The ALMA Interferometric Pipeline Heuristics
• A Pilot for a VLA HI Deep Field
• The Statistical Properties of Neutral Gas at z<1.65 from UV Measurements of Damped Lyman Alpha Systems
• VERTICO: The Virgo Environment Traced In CO Survey
• The EGNoG Survey: Molecular Gas in Intermediate-Redshift Star-Forming Galaxies
• The final data release of ALLSMOG: a survey of CO in typical local low-M* star-forming galaxies
• GOODS-Herschel: Separating High Redshift active galactic Nuclei and star forming galaxies Using Infrared Color Diagnostics
• Virgo Filaments I: Processing of gas in cosmological filaments around the Virgo cluster
• Atomic hydrogen in star-forming galaxies at intermediate redshifts
• A blind ATCA HI survey of the Fornax galaxy cluster: properties of the HI detections
• Statistical properties of damped Lyman-alpha systems from Sloan Digital Sky Survey DR12
• BUDHIES I: characterizing the environments in and around two clusters at z~0.2
• The AMIGA sample of isolated galaxies XIII. The HI content of an almost "nurture free" sample
• VERTICO II: effects of HI-identified environmental mechanisms on molecular gas
• Early Science with the Large Millimeter Telescope: COOL BUDHIES I - a pilot study of molecular and atomic gas at z~0.2
• VALES: I. The molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35
• KAT-7 Science Verification: Cold Gas, Star Formation, and Substructure in the Nearby Antlia Cluster
• CHILES: HI morphology and galaxy environment at z=0.12 and z=0.17
• Atomic Gas Scaling Relations of Star-forming Galaxies at $z\approx 1$
• BUDHIES IV: Deep 21-cm neutral Hydrogen, optical and UV imaging data of Abell 963 and Abell 2192 at z $\simeq$ 0.2
• Atomic Gas Dominates the Baryonic Mass of Star-forming Galaxies at $z\approx 1.3$
• ALMA shows that gas reservoirs of star-forming disks over the past 3 billion years are not predominantly molecular
• The Giant Metrewave Radio Telescope Cold-HI AT $z\approx 1$ Survey
• VERTICO IV: Environmental Effects on the Gas Distribution and Star Formation Efficiency of Virgo Cluster Spirals
• The HI mass function of star-forming galaxies at $\mathbf{z}\sim 0.35$
• MIGHTEE-HI: deep spectral line observations of the COSMOS field
• The EDGE-CALIFA survey: The resolved star formation efficiency and local physical conditions
• New constraints on the evolution of the MHI-M* scaling relation combining CHILES and MIGHTEE-HI data
• Morphological Evolution of the Hosts of Far-Infrared/Submillimeter Galaxies
• Molecular gas scaling relations for local star-forming galaxies in the low-$M_{\ast }$ regime
• Interferometric Cubelet Stacking to Recover H\,\textsc{i} Emission from Distant Galaxies
• The Qz5 Survey (I): How the HI Mass Density of the Universe Evolves With Cosmic Time