CHIMPS: the ${}^{13}$CO/C${}^{18}$O (J=3-2) Heterodyne Inner Milky Way Plane Survey

Abstract

We present the ${}^{13}$CO/C${}^{18}$O (J=3-2) Heterodyne Inner Milky Way Plane Survey (CHIMPS) which has been carried out using the Heterodyne Array Receiver Program on the 15 m James Clerk Maxwell Telescope (JCMT) in Hawaii. The high-resolution spectral survey currently covers |b| < 0.5 deg and 28 < l < 46 deg, with an angular resolution of 15 arcsec in 0.5 km/s velocity channels. The spectra have a median rms of $\sim$ 0.6 K at this resolution, and for optically thin gas at an excitation temperature of 10 K, this sensitivity corresponds to column densities of $N_{{\mathrm{H}}_2}\sim 3\times 10^{20}$cm${}^{-2}$ and $N_{{\mathrm{H}}_2}\sim 4\times 10^{21}$cm${}^{-2}$ for ${}^{13}$CO and C${}^{18}$O, respectively. The molecular gas that CHIMPS traces is at higher column densities and is also more optically thin than in other publicly available CO surveys due to its rarer isotopologues, and thus more representative of the three-dimensional structure of the clouds. The critical density of the J=3-2 transition of CO is $\gtrsim 10^4$ cm${}^{-3}$ at temperatures of $\le 20$ K, and so the higher density gas associated with star formation is well traced. These data complement other existing Galactic plane surveys, especially the JCMT Galactic Plane Survey which has similar spatial resolution and column density sensitivity, and the Herschel infrared Galactic Plane Survey. In this paper, we discuss the observations, data reduction and characteristics of the survey, presenting integrated emission maps for the region covered. Position-velocity diagrams allow comparison with Galactic structure models of the Milky Way, and while we find good agreement with a particular four arm model, there are some significant deviations.

arXiv commentAccepted by MNRAS, 15 pages, 9 figures

References in corpus (46)

• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The CO-to-H2 Conversion Factor
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• An atomic and molecular database for analysis of submillimetre line observations
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Hi-GAL: the Herschel infrared Galactic Plane Survey
• Structural Analysis of Molecular Clouds: Dendrograms
• Does IRAS 16293-2422 have a hot core? Chemical inventory and abundance changes in its protostellar environment
• The Bolocam Galactic Plane Survey: Survey Description and Data Reduction
• The Red MSX Source Survey: the Massive Young Stellar Population of our Galaxy
• The observed spiral structure of the Milky Way
• The Bolocam Galactic Plane Survey -- II. Catalog of the Image Data
• HARP/ACSIS: A submillimetre spectral imaging system on the James Clerk Maxwell Telescope
• From Massive Protostars to a Giant HII Region: Submillimeter Imaging of the Galactic Mini-starburst W43
• The Co-ordinated Radio and Infrared Survey for High Mass Star Formation (The CORNISH Survey) - I. Survey Design
• The Co-ordinated Radio and Infrared Survey for High-Mass Star Formation - II. Source Catalogue
• The RMS Survey: Galactic distribution of massive star formation
• Parallaxes for W49N and G048.60+0.02: Distant Star Forming Regions in the Perseus Spiral Arm
• Giant Molecular Filaments in the Milky Way
• ATLASGAL --- properties of compact HII regions and their natal clumps
• FellWalker - a Clump Identification Algorithm
• W43: the closest molecular complex of the Galactic Bar?
• The Parallax of W43: a Massive Star Forming Complex near the Galactic Bar
• Star formation in Galactic spiral arms and the inter-arm regions
• Star formation towards the Scutum tangent region and the effects of Galactic environment
• MUSCLE W49 : A Multi-Scale Continuum and Line Exploration of the Most Luminous Star Formation Region in the Milky Way. I. Data and The Mass Structure of the Giant Molecular Cloud
• The W43-MM1 mini-starburst ridge, a test for star formation efficiency models
• THOR - The HI, OH, Recombination Line Survey of the Milky Way - The pilot study: HI observations of the giant molecular cloud W43
• The Effect of Spiral Arms on Star Formation in the Galaxy
• The JCMT Plane Survey: early results from the l = 30 degree field
• The Arecibo HII Region Discovery Survey
• The Interstellar Medium and star formation on kpc size scales
• The morphology of the Milky Way - II. Reconstructing CO maps from disc galaxies with live stellar distributions
• Giant Molecular Clouds are More Concentrated to Spiral Arms than Smaller Clouds
• Star formation scales and efficiency in Galactic spiral arms
• Automated reduction of submillimetre single-dish heterodyne data from the James Clerk Maxwell Telescope using ORAC-DR
• Synthetic CO, H2 and HI surveys of the Galactic 2nd Quadrant, and the properties of molecular gas
• The Gas Properties of the W3 GMC: A HARP study
• The Bell Laboratories (13)CO Survey: Longitude-Velocity Maps
• Ionized Gas Towards Molecular Clumps: Physical Properties of Massive Star Forming Regions
• Massive star formation and feedback in W49A: The source of our Galaxy's most luminous water maser outflow

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• ATLASGAL --- properties of a complete sample of Galactic clumps
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
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• SEDIGISM: Structure, excitation, and dynamics of the inner Galactic interstellar medium
• ATLASGAL -- A Galaxy-wide sample of dense filamentary structures
• The Hi-GAL compact source catalogue -- II. The 360° catalogue of clump physical properties
• The SEDIGISM survey: first data release and overview of the Galactic structure
• GaussPy+: A fully automated Gaussian decomposition package for emission line spectra
• The Hi-GAL catalogue of dusty filamentary structures in the Galactic Plane
• The integrated properties of the molecular clouds from the JCMT CO(3-2) High Resolution Survey
• What can simulated molecular clouds tell us about real molecular clouds?
• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• A global view on star formation: The GLOSTAR Galactic Plane Survey. I. Overview and first results for the Galactic longitude range 28° < l < 36°
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• CHIMPS: Physical properties of molecular clumps across the inner Galaxy
• The JCMT Plane Survey: First complete data release - emission maps and compact source catalogue
• The MPIfR-MeerKAT Galactic Plane survey I -- System setup and early results
• The HI/OH/Recombination line survey of the inner Milky Way (THOR)
• H2O Southern Galactic Plane Survey (HOPS): Paper III - Properties of Dense Molecular Gas across the Inner Milky Way
• Distances and statistics of local molecular clouds in the first Galactic quadrant
• CHIMPS2: Survey description and ${}^{12}$CO emission in the Galactic Centre
• The prevalence of star formation as a function of Galactocentric radius
• SCOPE: SCUBA-2 Continuum Observations of Pre-protostellar Evolution - Survey Description and Compact Source Catalogue
• OH maser emission in the THOR survey of the northern Milky Way
• SEDIGISM-ATLASGAL: Dense Gas Fraction and Star Formation Efficiency Across the Galactic Disk
• ATLASGAL --- Molecular fingerprints of a sample of massive star forming clumps
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• The SEDIGISM survey: a search for molecular outflows
• Molecular gas distribution perpendicular to the Galactic plane
• Feedback in W49A diagnosed with radio recombination lines and models
• Autonomous Gaussian decomposition of the Galactic Ring Survey. I. Global statistics and properties of the 13CO emission data
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN). VI. Dense gas and mini-starbursts in the W43 giant molecular cloud complex
• The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way
• Young stars as tracers of a barred-spiral Milky Way
• Simultaneous evidence of edge collapse and hub-filament configurations: A rare case study of a Giant Molecular Filament G45.3+0.1
• The turbulent gas structure in the centers of NGC253 and the Milky Way
• Molecular cloud catalogue from ${}^{13}$CO(1-0) data of the Forgotten Quadrant Survey
• ATLASGAL -- physical parameters of dust clumps associated with 6.7 GHz methanol masers
• The dynamic centres of infrared-dark clouds and the formation of cores
• Meta-analysis from different tracers of the small Local Arm around the Sun - extent, shape, pitch, origin
• 12CO (3-2) High-Resolution Survey (COHRS) of the Galactic Plane: Complete Data Release
• Peering into the Milky Way by FAST: II. Ionized gas in the inner Galactic disk revealed by the piggyback line observations of the FAST GPPS survey
• Large-scale Velocity-coherent Filaments in the SEDIGISM Survey: Association with Spiral Arms and Fraction of Dense Gas
• Exploring the 13CO/C18O abundance ratio towards Galactic young stellar objects and HII regions
• 3-D CMZ IV: Distinguishing Near vs. Far Distances in the Galactic Center Using Spitzer and Herschel
• OGHReS: Star formation in the Outer Galaxy ($\ell =250^{\circ }$-$280^{\circ }$)
• HII regions and high-mass starless clump candidates I: Catalogs and properties
• Mapping the 13CO/C18O abundance ratio in the massive star forming region G29.96-0.02
• High resolution LAsMA ${}^{12}$CO and ${}^{13}$CO observation of the G305 giant molecular cloud complex : II. Effect of feedback on clump properties
• Identification of molecular clouds in emission maps: a comparison between methods in the \ce{^{13}CO}/\ce{C^{18}O} ($J=3-2$) Heterodyne Inner Milky Way Plane Survey
• Kinematics and star formation of hub-filament systems in W49A
• Magnetic fields in the Horsehead Nebula
• Spatial and velocity offsets of Galactic masers from the centers of spiral arms
• JWST reveals widespread CO ice and gas absorption in the Galactic Center cloud G0.253+0.016
• RJ-plots: An improved method to classify structures objectively
• Solenoidal turbulent modes and star formation efficiency in Galactic-plane molecular clouds
• Extreme star formation in the Milky Way: Luminosity distributions of young stellar objects in W49A and W51
• Cloud structures in M17 SWex : Possible cloud-cloud collision
• Physical properties of the molecular cloud, N4, in SS433; Evidence for an interaction of molecular cloud with the jet from SS433
• Planck CO revisited: Improved CO line emission maps from Planck space mission observations
• Characteristic scale of star formation. I. Clump formation efficiency on local scales
• Interarm islands in the Milky Way -- the one near the Cygnus spiral arm
• Studying star-forming processes at core and clump scales: the case of the young stellar object G29.862-0.0044
• Star formation in IRDC G31.97+0.07
• Preliminary analysis on the noise characteristics of MWISP data
• Autonomous Gaussian decomposition of the Galactic Ring Survey. II. The Galactic distribution of 13CO
• The warm and dense Galaxy - tracing the formation of dense cloud structures out to the Galactic Center
• OGHReS: Star formation in the Outer Galaxy II ($\ell =180^{\circ }$-$280^{\circ }$)
• Velocity-resolved high-J CO emission from massive star-forming clumps
• Unveiling the Main Sequence to Starburst Transition Region with a Sample of Intermediate Redshift Luminous Infrared Galaxies
• CHIMPS2: ${}^{13}$CO $J=3\to 2$ emission in the Central Molecular Zone
• MeerKAT and ALMA view of the AGAL045.804-0.356 clump
• Low-redshift analogues of cosmic noon galaxies as laboratories for clumpy star formation
• The Impact of Expanding HII Regions on Filament G37:Curved Magnetic Field and Multiple Direction Material Flows
• Insights into the structure and kinematics of a Milky Way-like galaxy