The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert...
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Transcript of The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert...
![Page 1: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/1.jpg)
The Survey for Ionized Gas in the Galaxy, Made with Arecibo
SIGGMA – the ALFA RRL Survey
Robert Minchin
![Page 2: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/2.jpg)
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
![Page 3: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/3.jpg)
Where?
Milky Way image: NASA/JPL-Caltech/R. Hurt
Inner Galaxy30° < l < 75°
Outer Galaxy175° < l 207°
![Page 4: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/4.jpg)
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
![Page 5: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/5.jpg)
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
![Page 6: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/6.jpg)
Who?
• Loren Anderson (WVU) – PI• Robert Minchin (Arecibo)• Yervant Terzian (Cornell)• Ed Churchwell (UWM)• Bin Liu (NAO/CAS)• Anish Roshi (NRAO)• Logan Hough (WVU)
![Page 7: The Survey for Ionized Gas in the Galaxy, Made with Arecibo SIGGMA – the ALFA RRL Survey Robert Minchin.](https://reader036.fdocument.org/reader036/viewer/2022082411/5697bfde1a28abf838cb23fe/html5/thumbnails/7.jpg)
Results?