170 likes | 429 Views
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
E N D
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 Granada
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
Modification • ACEX: ACS image drizzling • WFEX: WFC3 image (UVIS and IR) drizzling • DREX: Register images of different passbands Granada
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
Astrometric Accuracy WFEX WFC3RED Granada
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
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
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
Further improvements • Slight alignment on drizzled images • Flag and mask consolidation • CTE correction for ACS • Data server Granada
Summary • A working pipeline • Need more in-depth comparisons and quality checks • Need to accommodate new science requirements Granada
Many Thanks! • Amit Saraff • John Blakeslee, Larry Bradley • Warren Hack, Andy Fruchter Granada