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IRAC Science Data Simulator

IRAC Science Data Simulator. Matthew L. N. Ashby Jason A. Surace Joseph L. Hora S. T. Megeath Rick Arendt. IRAC Science Data Simulator. Coadd of simulated IRAC channel 1 frames. IRAC Science Data Simulator. Coadd of simulated IRAC channel 3 frames. IRAC Science Data Simulator.

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IRAC Science Data Simulator

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  1. IRAC Science Data Simulator Matthew L. N. Ashby Jason A. Surace Joseph L. Hora S. T. Megeath Rick Arendt ISDS v 2.21

  2. IRAC Science Data Simulator Coadd of simulated IRAC channel 1 frames ISDS v 2.21

  3. IRAC Science Data Simulator Coadd of simulated IRAC channel 3 frames ISDS v 2.21

  4. IRAC Science Data Simulator Coadd of simulated IRAC channel 2 frames ISDS v 2.21

  5. IRAC Science Data Simulator Coadd of simulated IRAC channel 4 frames ISDS v 2.21

  6. Current version: ISDSv2.21 Downloadable from the SSC: http://sirtf.caltech.edu/SSC/OST/isds.html Release notes/bug reports available from: http://cfa-www.harvard.edu/~mashby/isds.html IRAC Science Data Simulator ISDS v 2.21

  7. IRAC Science Data Simulator • Potential and actual uses for simulated data: • SSC: stress-test BCD pipeline algorithms • GTO teams: validate GTO plans • IOC: practice data reduction (esp. focus) • Assess impact of shutterless operation • Understand/correct instrumental artifacts • Other uses? ISDS v 2.21

  8. IRAC Science Data Simulator • ISDS simulates step-and-stare observing: • User processes AORs to create pseudo-command expansions (.isds files) • .isds files parsed by ISDS to simulate pointing commands and project IRAC FOV onto truthimages • output: simulated IRAC science data ISDS v 2.21

  9. Four inputs required: 1. Four ‘Truthimages’ 2. At least one AOR (from SPOTv6.1) 3. Image library 4. User parameters ISDS outputs: pseudo-command expansion Raw/BCD IRAC data (FITS files) IRAC Science Data Simulator ISDS v 2.21

  10. IRAC Science Data Simulator • Input AORs created by SPOTv6.1: • arbitrary number of AORs in a SPOT file • clustered AORs not supported • subarray, ped-sig modes not supported • dither patterns hard-wired Intermediate output product: A text file with all IRAC/PCS commands necessary to carry out the AOR. ISDS v 2.21

  11. IRAC Science Data Simulator • ISDS requires four truthimages: • populated with IR sources • PSF assumed known • noiseless • IR background optional • arbitrary pixel scale ISDS v 2.21

  12. IRAC Science Data Simulator • ISDS requires a library (FITS files): • derived from ground testing of flight hardware • gain maps • dark charge maps • linearity coefficients • cosmic ray templates (InSb, SiAs) ISDS v 2.21

  13. IRAC Science Data Simulator • User tailors output to task: • ‘raw’ or BCD-flavored FITS files • toggle instrumental artifacts (e.g., multiplexer bleed, image latency) • toggle observatory artifacts (e.g., jitter, pointing errors) ISDS v 2.21

  14. IRAC Science Data Simulator • A ‘raw’ channel 1 frame with a saturated star ISDS v 2.21

  15. IRAC Science Data Simulator • 36-point Reuleaux dither pattern, minimumdither scale, 30 s exposures in IRAC channel 3 ISDS v 2.21

  16. IRAC Science Data Simulator • C2d truthimage for ChameleonII, 3200x3200 IRAC pixels • stars plus dust ISDS v 2.21

  17. IRAC Science Data Simulator • Subset of ChamII truthimage ISDS v 2.21

  18. IRAC Science Data Simulator • Simulated IRAC ISDS mosaic built with IRAF’s imcombine • channel 1 only • 12 s frames only ISDS v 2.21

  19. IRAC Science Data Simulator • Simulated IRAC ISDS mosaic built with IRAF’s imcombine • channel 1 only • 12 s frames only ISDS v 2.21

  20. IRAC Science Data Simulator • Planned improvements: • Geometric and photometric distortion • Banding effect • Position-dependent PSF • Variation in effective wavelength across the FOV • Incremental updates to output FITS headers • Improved dither patterns (subpixel dithering) ISDS v 2.21

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