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Data Pipeline

Data Pipeline. Wei Zheng Johns Hopkins University. Requirements. Science images for ACS/WFC, WFC3/UVIS and WFC3/IR Detection image over all bands Filter Images with a common WCS grid Source catalogs Photometric redshift catalogs. APSIS. Extinction correction Extractor source catalogs

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Data Pipeline

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  1. Data Pipeline Wei Zheng Johns Hopkins University

  2. Requirements • Science images for ACS/WFC, WFC3/UVIS and WFC3/IR • Detection image over all bands • Filter Images with a common WCS grid • Source catalogs • Photometric redshift catalogs Granada

  3. APSIS • Extinction correction • Extractor source catalogs • Multicolor catalog • BPZ catalog • Image registration • Sky subtraction • Distortion correction • Cosmic ray rejection • Edge mask • Astrometric correction • Detection image Granada

  4. Modification • ACEX: ACS image drizzling • WFEX: WFC3 image (UVIS and IR) drizzling • DREX: Register images of different passbands Granada

  5. Flowchart All data present? WFC3 or ACS? .felt files Run ACEX ACS Yes WFC3 Run WFEX Check data on CLASH central storage via fast-track ftp No Run ACEX Image Align Image Combine Co-added images on common pixel grid Run DREX (0.065”) Master Detection Image Extractor Run WFEX Image Align Image Combine Source Catalogs in each passband PHOTO-Z Code(s) Multi-color catalog Co-added images in native resolution PHOTO-Z Catalog CLASH Science Team Data Archive

  6. Astrometric Accuracy WFEX WFC3RED Granada

  7. Pipeline Output: Images • Detection Image (0.065” scale) • Combined images in each band (0.065” scale) • Combined UVIS and WFC images in original scale Granada

  8. Pipeline Output: Catalogs • Running Sextractor • Source catalogs in each band • Multicolor catalog • Photometric redshifts • Mag_iso, mag_auto, and mag_aper at various sizes. Granada

  9. Processing Plan • One run for every visit • Accumulated data for each version • Typically eight versions of processed data per cluster • The final version has the best quality Granada

  10. Further improvements • Slight alignment on drizzled images • Flag and mask consolidation • CTE correction for ACS • Data server Granada

  11. Summary • A working pipeline • Need more in-depth comparisons and quality checks • Need to accommodate new science requirements Granada

  12. Many Thanks! • Amit Saraff • John Blakeslee, Larry Bradley • Warren Hack, Andy Fruchter Granada

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