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

UO-SIM OU-PHZ interactions

Institut de Ciències de l’Espai, ICE (IEEC/CSIC), Barcelona

Francisco Javier Castander

• n behalf of OU-PHZ

OU-PHZ within SGS

• SIP: EC SGS processing function that computes redshifts from

multi-wavelength imaging data

OU-PHZ Goal Operation

• From level 2 catalogues computes level 3 photometric redshifts

• SIP: EC SGS processing function that computes redshifts from

multi-wavelength imaging data

OU-PHZ Goal 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?

• mock galaxy catalogues, instrument response

OU-PHZ – OU-SIM interactions Input data needed 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, ….

• 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

OU-PHZ Needs Mock catalogues Instrument response

• total transmission

• 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?

OU-PHZ -- OU-SIM interactions