The Survey for Ionized Gas in the Galaxy, Made with Arecibo
7
The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin
description
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 - PowerPoint PPT Presentation
Transcript of 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• Lead project (supporting P-ALFA and ALFA
ZOA) in the outer Galaxy
Where?
Milky Way image: NASA/JPL-Caltech/R. Hurt
Inner Galaxy30° < l < 75°
Outer Galaxy175° < l 207°
Why?
• Identification of HII regions• Measure electron temperatures (via line to
continuum ratio)• Probe properties of nebular Photo-
Dissociation Regions (withcarbon RRLs)• Look for extended emission from the Warm
Interstellar Medium
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
Who?
• Loren Anderson (WVU) – PI• Robert Minchin (Arecibo)• Yervant Terzian (Cornell)• Ed Churchwell (UWM)• Bin Liu (NAO/CAS)• Anish Roshi (NRAO)• Logan Hough (WVU)
Results?
