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ALFA

GALFA-HI is a 4′, large area, Galactic HI survey. Arecibo 305 m. ALFA. GALSPECT. GALFA-HI compared to past, present, future surveys. WNSHS/GAMES WALLABY/GASKAP. EBHIS. IGPS. JEGP+ 11. Arecibo Surveys. ALFA Surveys. PALFA. TOGS. TOGS2. EALFA. Other instrument surveys. GALFA.

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ALFA

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  1. GALFA-HI is a 4′,large area, Galactic HI survey Arecibo 305 m ALFA GALSPECT

  2. GALFA-HI compared to past, present, future surveys WNSHS/GAMES WALLABY/GASKAP EBHIS IGPS JEGP+ 11

  3. Arecibo Surveys ALFA Surveys PALFA TOGS TOGS2 EALFA Other instrument surveys GALFA I-GALFA PIs ZOA ALFALFA AGES AUDS GALFA-HI GALFACTS GALFA-RRL (some data taken contemporarily)

  4. GALFA-HI owes a lot of commensal observing!

  5. GALFA-HI DR1 is available to the public. DR2 soon! JEGP+ 11

  6. GALFA-HI matches IRAS and Planck resolutions Extinction HI FIR

  7. GALFA-HI matches IRAS and Planck resolutions Extinction HI FIR

  8. Interstellar morphologies: Cigars, Filaments, Needles Blobs Pancakes, Sheets Even Bicycle Wheels!

  9. GALFA FINDS HI BLOBS

  10. (Ap J, In press)

  11. Both small and weak!

  12. GALFA finds long, straight HI FILAMENTS!

  13. SHEETS are old hat. Consider this famous paper—the earliest known (to me) example of this geometry in the normal ISM…

  14. Here’s our Arecibo Millennium-survey friend 3C225b, showing prominent HI absorption. We measure the temperature (17 K); we use ISM pressure (4000 cm-3 K) to get volume density. N(HI) ~ 1019 cm-2 n(HI) ~ 200 cm-3 N(HI)=n(HI) * L WHAT’S L????

  15. Arecibo (GALFA) map of the Knapp ultrathin sheet.

  16. Haud (2010) mapped the narrowest HI emission component: our cold thin cloud is part of a much larger structure, well-fit by an expanding ring! The whole structure is half in, half out of the Local Bubble… Our two ultrathin sheets

  17. A crude sketch of Haud’s rotating, expanding, translating “bicycle wheel in space”, looking down onto the Galaxy…

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