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GALFA Test Observations & Plans (A1943)

GALFA Test Observations & Plans (A1943). Goals:. Testing GALFA Spectrometer Mapping modes: Basketweave scanning (JOSH’s TALK) & drift/driven mapping. Observing a reference position: test ‘Smart Frequency Switching’ (CARL’s TALK)

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GALFA Test Observations & Plans (A1943)

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  1. GALFA Test Observations & Plans (A1943) Goals: • Testing GALFA Spectrometer • Mapping modes: Basketweave scanning (JOSH’s TALK) & drift/driven mapping. • Observing a reference position: test ‘Smart Frequency Switching’ (CARL’s TALK) • Standing wave extraction: test Fourier technique (simultaneous narrow & wide bandwidths) & (maybe) X-correlation technique. • Take cross/spider scans to characterize beam performance and especially day-to-day stability.

  2. An Army of Observers: • Josh Goldston (Berkeley) • Yvonne Kei-Nam Tang (Cornell) • Jagadheep D. (Cornell) • Marko Krco (Cornell) • Jea-Joon Lee (Seoul National University) • Tim Robishaw (Berkeley) • Di Li (CfA) • Desh (NAIC) • Carl Heiles (Berkeley) • Snezana Stanimirovic (Berkeley) • ANYBODY ELSE? TALK TO ME!

  3. B Science Projects: • B: High Latitude Cloud MBM40 (Arecibo & GBT data exist, extended) • A: Quiescent Dark Cloud L1544 (broad, strong lines in emission + a narrow line in absorption) • C: Compact HVC CHVC218+29+145 (compact, narrow & weak lines) • D: Forbidden Velocity Wing Source 40.0+0.5 (faint line wings) • E: Tip of the Magellanic Stream (weak & broad lines) A

  4. Observing Schedule:

  5. Observing Plans: • Sep 3, AST=0845-1030: warming up & various setup issues, test observing software • Sep 3, 4 & 5, AST=1630-1900, 1900-2145 & 2330-0200: • (a) cross scans to check stability • (b) ‘smart frequency switching’ to get a ref. spectrum (10mins) • (c) 7 beams & 7 WAPPs in narrow mode (~10 MHz) + • 1 beam (central) & 1 WAPP in wide mode (~100 MHz) • (d) basketweave scanning: area=4x1 deg, time=25 mins • (maybe more) • (e) ‘smart frequency switching’ (10mins) • (f) repeat this pattern for 3 consecutive days.

  6. Observing Plans – Project E: Tip of the Magellanic Stream • 4 x 1 deg area • driving rate is 0.95 deg per min (= 3.5 siderial rate), angle is 75 deg • separation bw beam scans is ~2.8 arcmin, slightly undersampled • one up & down sweep takes 3 mins • int. time per footprint is 15 sec.

  7. Observing Plans – Project E: 4 x 1 deg area uniformly covered in 25 mins. (per day) with 3 crossings per point. 10 x 1 deg area covered in 55 mins.

  8. Observing Plans – Project A & C: • Drift scans, 1 sq. deg/70x40 arcmin • Arecibo/Effelsberg data already exist for comparison. …While Observing… • Investigate header parameters & needed additions/modifications. • Work on On-line-monitoring specific for GALFA surveys. • Develop basic diagnostic tools in IDL for data quality monitoring (based on Phil’s IDL routines). • Implement BW data reduction for ALFA (single pixel exist). • Implement SFS data reduction in IDL for ALFA. • Develop Fourier technique for standing wave removal in IDL.

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