The Atacama Cosmology Telescope: CO(J = 3 - 2) mapping and lens modeling of an ACT-selected dusty star-forming galaxy

Abstract

We report Northern Extended Millimeter Array (NOEMA) CO($J=3-2$) observations of the dusty star-forming galaxy ACT-S\,J020941+001557 at $z=2.5528$, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial survey. Our spatially resolved spectral line data support the derivation of a gravitational lens model from 37 independent velocity channel maps using a pixel-based algorithm, from which we infer a velocity-dependent magnification factor $\mu \approx 7-22$ with a luminosity-weighted mean $⟨\mu ⟩\approx 13$. The resulting source-plane reconstruction is consistent with a rotating disk, although other scenarios cannot be ruled out by our data. After correction for lensing, we derive a line luminosity $L_{\mathrm{CO}(3-2)}^{\prime }=(5.53\pm 0.69)\times 10^{10}\mathrm{K}\mathrm{km}{\mathrm{s}}^{-1}\mathrm{p}{\mathrm{c}}^2$, a cold gas mass $M_{\mathrm{gas}}=(3.86\pm 0.33)\times 10^{10}{M}_{\odot }$, a dynamical mass $M_{\mathrm{dyn}}{\sin }^{2}i=3.9_{-1.5}^{+1.8}\times 10^{10}{M}_{\odot }$, and a gas mass fraction $f_{\mathrm{gas}}{\csc }^{2}i=1.0_{-0.4}^{+0.8}$. The line brightness temperature ratio of $r_{3,1}\approx 1.6$ relative to a Green Bank Telescope CO($J=1-0$) detection may be elevated by a combination of external heating of molecular clouds, differential lensing, and/or pointing errors.

arXiv comment8 pages, 5 figures, accepted to ApJ

References in corpus (38)

• The Seventh Data Release of the Sloan Digital Sky Survey
• Detailed Structural Decomposition of Galaxy Images
• The CO-to-H2 Conversion Factor
• Unveiling Dust-enshrouded Star Formation in the Early Universe: a Sub-mm Survey of the Hubble Deep Field
• A Deep Sub-millimeter Survey of Lensing Clusters: A New Window on Galaxy Formation and Evolution
• Submillimeter Galaxies
• Dusty Star-Forming Galaxies at High Redshift
• Dusty star forming galaxies at high redshift
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• An Accurate Flux Density Scale from 1 to 50 GHz
• Extragalactic millimeter-wave sources in South Pole Telescope survey data: source counts, catalog, and statistics for an 87 square-degree field
• Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA
• The Atacama Cosmology Telescope: The Receiver and Instrumentation
• A massive core for a cluster of galaxies at a redshift of 4.3
• Optical Design of the Atacama Cosmology Telescope and the Millimeter Bolometric Array Camera
• Herschel-ATLAS: a binary HyLIRG pinpointing a cluster of starbursting proto-ellipticals
• HerMES: Candidate Gravitationally Lensed Galaxies and Lensing Statistics at Submillimeter Wavelengths
• The rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
• Extragalactic millimeter-wave point source catalog, number counts and statistics from 771 square degrees of the SPT-SZ Survey
• Blind detections of CO J = 1--0 in 11 H-ATLAS galaxies at z = 2.1--3.5 with the GBT/Zpectrometer
• Planck's Dusty GEMS: Gravitationally lensed high-redshift galaxies discovered with the Planck survey
• Candidate Gravitationally Lensed Dusty Star-forming Galaxies in the Herschel Wide Area Surveys
• Warm gas in central regions of nearby galaxies. Extended mapping of CO(3-2) emission
• Early Science with the Large Millimeter Telescope: Observations of Extremely Luminous High-z Sources Identified by Planck
• Imaging the Molecular Gas Properties of a Major Merger Driving the Evolution of a z=2.5 Submillimeter Galaxy
• Dark Matter Substructure Detection Using Spatially Resolved Spectroscopy of Lensed Dusty Galaxies
• A Total Molecular Gas Mass Census in z~2-3 Star-forming Galaxies: Low-J CO Excitation Probes of Galaxies' Evolutionary States
• The Atacama Cosmology Telescope: Dusty Star-Forming Galaxies and Active Galactic Nuclei in the Southern Survey
• Observing Cold Gas in Submillimeter Galaxies: Detection of CO(1-0) Emission in SMM J13120+4242 with the Green Bank Telescope
• The Red Radio Ring: a gravitationally lensed hyperluminous infrared radio galaxy at z=2.553 discovered through citizen science
• Total Molecular Gas Masses of Planck - Herschel Selected Strongly Lensed Hyper Luminous Infrared Galaxies
• Statistical and systematic uncertainties in pixel-based source reconstruction algorithms for gravitational lensing
• On the redshift distribution and physical properties of ACT-selected DSFGs
• A magnified view of circumnuclear star formation and feedback around an AGN at z=2.6
• On the use of shapelets in modelling resolved, gravitationally lensed images
• Photon Dominated Region Modeling of Barnard 68
• The first IRAM/PdBI polarimetric millimeter survey of active galactic nuclei. II. Activity and properties of individual sources
• Excitation Conditions in the Multi-component Submillimeter Galaxy SMM J00266+1708

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