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Enhancing Spitzer Photometry: Collaborative Strategies and Methodologies for Accurate Catalogs

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This discussion session focuses on enhancing Spitzer photometry through team updates and coordinated efforts. Key elements include reviewing PSFs in HST and Spitzer data, building robust Spitzer Source Extractor catalogs, and analyzing quantitative structural parameters from Spitzer mosaics. We need to account for crowding using effective detection parameters and methods like Galfit and pygfit. The session will facilitate collaboration among team members to streamline efforts and improve our photometric analyses, with notes available on CLASH Wiki for ongoing projects.

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Enhancing Spitzer Photometry: Collaborative Strategies and Methodologies for Accurate Catalogs

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Presentation Transcript

  1. Spitzer photometry and more Discussion session goals: Update team & coordinate efforts

  2. Elements involved in discussion • PSFs in all bands (HST & Spitzer) • Robust Spitzer Source Extractor photometry catalogs • Quantitative structural parameters

  3. Spitzer Mosaics • C.f. update on clashwiki for IRAC • Note: MIPS mosaics not yet staged!

  4. In situ photometry method • Source Extractor • Critical to set detection parameters appropriately, to account for the crowding • E.g. a mexican hat, or simply no convolution kernel works well • Parameters have been vetted, and new catalogs have been generated • Everything is staged online, and notes are on clashwiki

  5. Accounting for crowding • Local • Galfit fitting within IRAC mosaics • Using high-res information • TFIT (though not using this) • IvoPhot (unresolved-convolution-based) • Python galaxy fitting (pygfit) (uses full resolution structural information)

  6. pygfit • Produces “clean” photometry and uncertainties from crowded low-resolution mosaics • Paper submitted to PASP. • See http://www.baryons.org/pygfit/ for • paper, • full code including an example, and full simulation suite • cookbook • In process of applying it to CLASH • Spitzer PSFs and good IRAC mosaic rms images are critical, testing underway • Need person power! • Leonardo+others at STScI? • Other CLASH team members?

  7. HST PSFs Needed for high-resolution structural fits… • Methodology • List of unresolved sources • PSFEx • Target & band • Individual FLT files vs mosaics • Parallel efforts • Coe • Alberto • Leonardo+ • John • Others? • We need to organize all efforts on the archive, systematically!

  8. Spitzer PSFs • Handbook PSFs – but orientation and AOR details an issue • Using the HST-determined unresolved source list • > empirical PSFs for Channel 1 and 2 for all fields • Other? PSFEx? Handbook + AOR processed?... • C.f. clashwiki update

  9. GALAPAGOS/Galfit/dimage status • Ulli; goal: HST structure • 1206, F814W • 1206 flanking fields, F814W • 2248, F814W in progress • Amata; goal: Subaru structure, calibrate via HST overlap • A383, F814W • 1206, F814W • 0416, F814W • Leonardo; goal: needed to have something to test pygfit • MACS 0329, F606W • John M, dimage; goal: ICL • 1206, F160W

  10. Vetting photometry with SED fitting • See quality analysis plots!

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