Forward modeling of multi-frequency HRRLs at 342 MHz, 800 MHz and 5.8 GHz constrains electron densities of dense warm ionized gas in the Galactic plane to 6–15 cm^{-3}.
The Southern Galactic Plane Survey: HI Observations and Analysis
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
We describe the HI component of the Southern Galactic Plane Survey (SGPS). The SGPS is a large-scale project to image at arcminute resolution the HI spectral line and 21 cm continuum emission in parts of the plane of the Milky Way. The survey covers Galactic longitudes 253 deg < l < 358 deg and latitudes |b| <1.5 deg (SGPS I), plus a first quadrant extension covering 5 deg < l < 20 deg and |b| <1.5 deg (SGPS II). The survey combines data from the Australia Telescope Compact Array and the Parkes Radio Telescope for sensitivity to angular scales ranging from 2 arcminutes to several degrees. The combined data cover 325 sq-deg and have an rms sensitivity of 1.6 K. Here we describe the HI observations and data reduction in detail, and present examples from the final data products. The complete dataset is publicly available through the Australia Telescope National Facility's HI Surveys archive. This dataset provides an unprecedented view of the neutral component of interstellar hydrogen in the inner Milky Way.
fields
astro-ph.GA 1years
2026 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
Constraints on the properties of warm ionized gas from low-frequency hydrogen radio recombination lines
Forward modeling of multi-frequency HRRLs at 342 MHz, 800 MHz and 5.8 GHz constrains electron densities of dense warm ionized gas in the Galactic plane to 6–15 cm^{-3}.