UO-SIM OU-PHZ interactions Francisco Javier Castander on behalf of - PowerPoint PPT Presentation

Jul 24, 2023 •115 likes •216 views

UO-SIM OU-PHZ interactions Francisco Javier Castander on behalf of OU-PHZ Institut de Cincies de lEspai, ICE (IEEC/CSIC), Barcelona OU-PHZ within SGS OU-PHZ Goal SIP: EC SGS processing function that computes redshifts from

UO-SIM OU-PHZ interactions Francisco Javier Castander on behalf of OU-PHZ Institut de Ciències de l’Espai, ICE (IEEC/CSIC), Barcelona
OU-PHZ within SGS
OU-PHZ Goal • SIP: EC SGS processing function that computes redshifts from multi-wavelength imaging data Operation • From level 2 catalogues computes level 3 photometric redshifts
OU-PHZ Goal • SIP: EC SGS processing function that computes redshifts from multi-wavelength imaging data Operation • From level 2 catalogues computes level 3 photometric redshifts Need from OU-SIM • Input catalogues, instrument responses and validation output • what should the input catalogues include?
OU-PHZ – OU-SIM interactions Input data needed • mock galaxy catalogues, instrument response Status/Plan algorithms • To generate catalogues: several groups have already code • photo-z algorithms: several within the collaboration Framework • Access to galaxy catalogue parameters & instrument performances Output data • Redshifts • redshift PDF • other galaxy parameters: stellar mass, SFR, ….
OU-PHZ Needs Mock catalogues • Photometry (magnitudes/fluxes, errors) • What kind? • simple aperture • scaled aperture (isophotal, Kron, petrosian,… • weighted aperture: PSF-matched • model magnitude • error: statistical and/or systematics: need to go through imaging? • gradients • Euclid + ground surveys • Other galaxy parameters: radius, concentration, ellipticity, components decomposition (e.g., bulge-disk), surface brightness, …
OU-PHZ Needs Mock catalogues • training and validation samples • galaxy modeling and observations • which objects? Galaxies, AGN, stars • need clustering? N(z) through cross-correlation Instrument response • total transmission
OU-PHZ -- OU-SIM interactions • Simulations what for? • photo-z algorithms • imaging and pipeline needs • spectroscopic needs • templates build-up • needs for cross-correlations • How much needs/can/should be done within OU-PHZ (some photo-z codes already set-up to generate simulations/mocks) and how much done by OU-SIM? • anyhow done within OU-SIM infrastructure • role of other OUs (OU-MER) • Some mocks needs to go through other OUs -> Data challenge: e2e Needed for realistic? errors and systematics • data model: what parameters needed in the simulations?

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