A Large Scale, Low Frequency Murchison Widefield Array Survey of Galactic HII regions between 260< l <\340

Abstract

We have compiled a catalogue of HII regions detected with the Murchison Widefield Array (MWA) between 72 and 231MHz. The multiple frequency bands provided by the MWA allow us identify the characteristic spectrum generated by the thermal Bremsstrahlung process in HII regions. We detect 302 HII regions between 260 < l < 340 and report on the positions, sizes, peak, integrated flux density, and spectral indices of these HII regions. By identifying the point at which HII regions transition from the optically thin to thick regime we derive the physical properties including the electron density, ionised gas mass and ionising photon flux, towards 61 HII regions. This catalogue of HII regions represents the most extensive and uniform low frequency survey of HII regions in the Galaxy to date.

arXiv comment20 pages, 9 figures, 3 tables

References in corpus (31)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• Toward Understanding Massive Star Formation
• The WISE Catalog of Galactic HII Regions
• Massive Stars: Their Environment and Formation
• Science with the Murchison Widefield Array
• GLEAM: The GaLactic and Extragalactic All-sky MWA survey
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• Compact continuum source-finding for next generation radio surveys
• The Co-ordinated Radio and Infrared Survey for High Mass Star Formation (The CORNISH Survey) - I. Survey Design
• Star Formation in Massive Clusters via the Wilkinson Microwave Anisotropy Probe and the Spitzer Glimpse Survey
• The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation
• BLOBCAT: Software to Catalogue Flood-Filled Blobs in Radio Images of Total Intensity and Linear Polarization
• The Southern Galactic Plane Survey: Polarized Radio Continuum Observations and Analysis
• A Determination of the Spectral Index of Galactic Synchrotron Emission in the 1-10 GHz range
• The Molonglo Galactic Plane Survey: I. Overview and Images
• The Green Bank Telescope Galactic H II Region Discovery Survey
• The G305 star-forming complex: the central star clusters Danks 1 and Danks 2
• The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14,110 Compact Radio Sources over 6,100 Square Degrees
• The Density and Mass of Unshocked Ejecta in Cassiopeia A through Low Frequency Radio Absorption
• The Arecibo HII Region Discovery Survey
• Spatially-resolved Thermal Continuum Absorption against the Supernova Remnant W49B
• Interpreting the Low Frequency Radio Spectra of Starburst Galaxies: A Pudding of Strömgren Spheres
• A New Radio Catalog of Compact HII Regions in the Milky Way II. The 1.4 GHz Data
• 74 MHz Discrete HII Absorption Regions Towards The Inner Galaxy
• The G305 star forming complex: Wide-Area molecular mapping of NH3 and H2O masers
• The G305 star-forming complex: radio continuum and molecular line observations
• Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array
• Feature Detection in Radio Astronomy using the Circle Hough Transform
• Spatially Resolved Low Frequency VLA observations of the Supernova Remnant 3C 391

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• A First Look for Molecules between 103 and 133 MHz using the Murchison Widefield Array
• Low frequency measurements of synchrotron absorbing HII regions and modeling of observed synchrotron emissivity
• A more detailed look at Galactic magnetic field models: using free-free absorption in HII regions
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• A Spatially Resolved Radio Spectral Index Study of the Dwarf Irregular Galaxy NGC\,1569
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