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

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

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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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