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The Survey for Ionized Gas in the Galaxy, Made with Arecibo

SIGGMA is an ALFA survey to detect Hydrogen, Helium, and Carbon radio recombination lines in the Milky Way. By identifying HII regions and probing nebular regions, it aims to measure electron temperatures and study the Warm Interstellar Medium.

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The Survey for Ionized Gas in the Galaxy, Made with Arecibo

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  1. The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin

  2. What? • ALFA survey for Hydrogen, Helium and Carbon Radio Recombination Lines: • H163α – H174α • He163α – He174α • C163α – C174α • Commensal with P-ALFA in the inner Galaxy • Lead project (supporting P-ALFA and ALFA ZOA) in the outer Galaxy

  3. Where? Inner Galaxy 30° < l < 75° Outer Galaxy 175° < l 207° Milky Way image: NASA/JPL-Caltech/R. Hurt

  4. Why? • Identification of HII regions • Measure electron temperatures (via line to continuum ratio) • Probe properties of nebular Photo-Dissociation Regions (withcarbonRRLs) • Look for extended emission from the Warm Interstellar Medium

  5. When? • Observations started in 2010 • Currently on-going How? • ‘Leapfrog’ mapping based on the P-ALFA tiling pattern • Co-addition of the H, He and C lines within the 300 MHz ALFA bandpass

  6. Who? • Loren Anderson (WVU) – PI • Robert Minchin (Arecibo) • YervantTerzian (Cornell) • Ed Churchwell (UWM) • Bin Liu (NAO/CAS) • AnishRoshi (NRAO) • Logan Hough (WVU)

  7. Results?

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