GALFA Test Observations & Plans (A1943)  Testing GALFA Spectrometer  Mapping modes: Basketweave scanning (JOSH’s TALK) & drift/driven mapping.  Observing.

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Presentation transcript:

GALFA Test Observations & Plans (A1943)  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. Goals:

 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! An Army of Observers:

 C: Compact HVC CHVC (compact, narrow & weak lines)  D: Forbidden Velocity Wing Source (faint line wings)  E: Tip of the Magellanic Stream (weak & broad lines) 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) B A

Observing Schedule:

Observing Plans: Sep 3, AST= : warming up & various setup issues, test observing software Sep 3, 4 & 5, AST= , & : (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.

Observing Plans – Project E: 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. Tip of the Magellanic Stream

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.

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.