The RMS Survey: Resolving kinematic distance ambiguities towards a sample of compact HII regions using HI absorption

Abstract

We present high-resolution HI data obtained using the Australia Telescope Compact Array to resolve the near/far distance ambiguities towards a sample of compact HII regions from the Red MSX Source (RMS) survey. The high resolution data are complemented with lower resolution archival HI data extracted from the Southern and VLA Galactic Plane surveys. We resolve the distance ambiguity for nearly all of the 105 sources where the continuum was strong enough to allow analysis of the HI absorption line structure. This represents another step in the determination of distances to the total RMS sample, which with over 1,000 massive young stellar objects and compact HII regions, is the largest and most complete sample of its kind. The full sample will allow the distribution of massive star formation in the Galaxy to be examined.

Accepted by MNRAS. This paper consists of 15 pages and contains 10 figures and 5 tables

References in corpus (8)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The VLA Galactic Plane Survey
• Resolution of the Distance Ambiguity for Galactic HII Regions
• The Luminosity Functions and Timescales of MYSOs and Compact HII regions
• The RMS Survey: Radio observations of candidate massive YSOs in the southern hemisphere
• The RMS Survey: Mid-Infrared Observations of Candidate Massive YSOs in the Southern Hemisphere
• The RMS Survey: ${}^{13}$CO observations of candidate massive YSOs in the northern Galactic plane
• Resolving distance ambiguities towards 6.7 GHz methanol masers

Cited by in corpus (53)

• The WISE Catalog of Galactic HII Regions
• ATLASGAL --- properties of a complete sample of Galactic clumps
• The Red MSX Source Survey: the Massive Young Stellar Population of our Galaxy
• The observed spiral structure of the Milky Way
• Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate
• ATLASGAL --- towards a complete sample of massive star forming clumps
• The Co-ordinated Radio and Infrared Survey for High Mass Star Formation (The CORNISH Survey) - I. Survey Design
• The RMS Survey: Galactic distribution of massive star formation
• ATLASGAL --- properties of compact HII regions and their natal clumps
• The 6-GHz methanol multibeam maser catalogue IV: Galactic longitudes 186 to 330 including the Orion-Monoceros region
• A distance limited sample of massive molecular outflows
• Rotation Curve of the Milky Way out to $\sim$ 200 kpc
• The Milky Way Project: A statistical study of massive star formation associated with infrared bubbles
• Kinematic Distances: A Monte Carlo Method
• ATLASGAL - Kinematic distances and the dense gas mass distribution of the inner Galaxy
• ATLASGAL-selected massive clumps in the inner Galaxy III. Dust Continuum Characterization of an Evolutionary Sample
• The RMS Survey: Near-IR Spectroscopy of Massive Young Stellar Objects
• ATLASGAL -- Evolutionary trends in high-mass star formation
• There are no starless massive proto-clusters in the first quadrant of the Galaxy
• CO bandhead emission of massive young stellar objects: determining disc properties
• The Green Bank Telescope HII Region Discovery Survey: III. Kinematic Distances
• Giant molecular clouds and massive star formation in the southern milky way
• Water in star-forming regions with Herschel (WISH). IV. A survey of low-J H2O line profiles toward high-mass protostars
• Metallicity Structure in the Milky Way Disk Revealed by Galactic HII Regions
• Stellar clusters in the inner Galaxy and their correlation with cold dust emission
• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• Chasing discs around O-type (proto)stars - ALMA evidence for an SiO disc and disc wind from G17.64+0.16
• The VLTI/MIDI survey of massive young stellar objects - Sounding the inner regions around intermediate- and high-mass young stars using mid-infrared interferometry
• Different evolutionary stages in massive star formation. Centimeter continuum and H2O maser emission with ATCA
• Methanol Maser Associated Outflows: Detection statistics and properties
• Rotation Curve and Mass Distribution in the Galaxy from the Velocities of Objects at Distances up to 200 kpc
• The Coordinated Radio and Infrared Survey for High-Mass Star Formation III. A catalogue of northern ultra-compact H II regions
• A distance limited sample of massive star forming cores from the RMS survey
• The role of spiral arms in Milky Way star formation
• Properties of massive star-forming clumps with infall motions
• Interstellar gas towards the TeV gamma-ray sources HESS J1640-465 and HESS J1641-463
• HI Absorption Toward HII Regions at Small Galactic Longitudes
• A statistical study of gaseous environment of Spitzer interstellar bubbles
• Fingerprinting the effects of hyperfine structure on CH and OH far infrared spectra using Wiener filter deconvolution
• Unveiling the traits of massive young stellar objects through a multi-scale survey
• A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines
• A Complete Atlas of HI Absorption toward HII Regions in the Southern Galactic Plane Survey (SGPS1)
• The environment of the gamma-ray emitting SNR G338.3-0.0: a hadronic interpretation for HESS J1640-465
• Helium Ionization in the Diffuse Ionized Gas surrounding UCHII regions
• The RMS Survey: Ammonia mapping of the environment of young massive stellar objects II
• Surveying the Giant HII Regions of the Milky Way with SOFIA: IV. Sgr D, W42, and a Reassessment of the Giant HII Region Census
• Tying the geometrical traits of massive young stellar objects and their discs to a potential evolutionary sequence using infrared observations
• A search for High Mass Stars Forming in Isolation using CORNISH & ATLASGAL
• Herschel Hi-GAL imaging of massive young stellar objects
• Extended Ionized Fe Objects in the UWIFE Survey
• H I absorption line and anomalous dispersion in the radio pulses of PSR B1937+21
• Search for High-Mass Protostellar Objects in Cold IRAS Sources
• Far-infrared line emission from the outer Galaxy cluster Gy 3-7 with SOFIA/FIFI-LS: Physical conditions and UV fields