SIGGMA: Ionized Gas Survey of the Galactic Plane from Arecibo

The Survey of Ionized Gas of the Galaxy, Made with the Arecibo telescope (SIGGMA) provides a fully-sampled view of radio recombination line (RRL) emission from the portion of the Galactic plane visible by Arecibo. It includes 319 RRL detections for 244 known HII regions and 108 new detections for 79 HII region candidates, with an angular resolution of 6 arcminutes and a velocity resolution of 5.1 km/s. The data was produced by Bin Liu of the Chinese Academy of Sciences.

Use Cases

• Cataloging HII regions based on radio recombination line emission.
• Studying the distribution and properties of ionized gas in the inner Galaxy.
• Identifying and analyzing Carbon RRL emission regions coincident with HII regions.
• Investigating radio recombination line emission in the direction of supernova remnants.

Strengths

• Described as the most sensitive large-scale fully-sampled RRL survey extant, with a stacked RRL rms of ~0.65 mJy beam⁻¹.
• Covers a specific inner Galaxy region (32° ≤ l ≤ 70°, |b| ≤ 1.5°) with full sampling.
• Provides detections for 244 known HII regions and identifies 79 HII region candidates.

Limitations

• Row count, file formats, and column-level documentation are unknown, limiting suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

Chinese Academy of Sciences (Author: Bin Liu)

Collection Method

Observations made with the Arecibo L-band Feed Array (ALFA) on the Arecibo telescope.

Geography

Inner Galaxy region: Galactic longitude 32° to 70°, Galactic latitude within ±1.5°.