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EGS Photometric Redshifts - V1 (20180608)

EGS/master_catalogue_egs_20180501_photoz_20180608.fits

Key information

Masterlist used:

dmu1/dmu1_ml_EGS/data/master_catalogue_egs_20180501.fits

Spectroscopic redshift sample used:

dmu23/dmu23_EGS/data/EGS-specz-v2.1_hedam.csv

Templates used:

  • EAZY Default
  • Atlas of Galaxy SEDs (Brown et al. 2014)
  • XMM-COSMOS Template library

Filters used (Templates):

"Available" corresponds to aperture magnitudes. Additional total magnitudes are present in the masterlist but not used during photo-z fitting.

Telescope / Instrument Filter Available Used
Subaru/HSC suprime_g Yes Yes
Subaru/HSC suprime_g Yes Yes
Subaru/HSC suprime_i Yes Yes
Subaru/HSC suprime_z Yes Yes
Subaru/HSC suprime_y Yes Yes
CFHT/Megacam megacam_u Yes Yes
CFHT/Megacam megacam_g Yes Yes
CFHT/Megacam megacam_r Yes Yes
CFHT/Megacam megacam_i Yes Yes
CFHT/Megacam megacam_z Yes Yes
HST/ACS acs_f606w Yes Yes
HST/ACS acs_f814w Yes Yes
HST/WFC3 wfc3_f125w Yes Yes
HST/WFC3 wfc3_f160w Yes Yes
Bok/90prime 90prime_g Yes Yes
Bok/90prime 90prime_r Yes Yes
Mayall/MOSAIC mosaic_z Yes Yes
Pan-STARRS1/Pan-STARRS1 gpc1_g Yes No
Pan-STARRS1/Pan-STARRS1 gpc1_r Yes No
Pan-STARRS1/Pan-STARRS1 gpc1_i Yes No
Pan-STARRS1/Pan-STARRS1 gpc1_z Yes No
Pan-STARRS1/Pan-STARRS1 gpc1_y Yes No
CFHT/WIRCam wircam_j Yes Yes
CFHT/WIRCam wircam_h Yes Yes
CFHT/WIRCam wircam_ks Yes Yes
Palomar/WIRCS wircs_j Yes Yes
Palomar/WIRCS wircs_k Yes Yes
UKIDSS/WFCAM ukidss_j Yes Yes

Additional Machine Learning Estimates

For the main galaxy population, three additional Gaussian Process machine learning estimates were also incorporated into the Bayesian combination estimates. These were training using the combined spectroscopic sample - with cost-sensitive learning weights calibrated for the full field. The two sets of filters used were:

  • Megacam u, g, r, i, z
  • HSC g, r, i, z, y

Additional selections applied:

  • In order to have a fully calibrated redshift estimate, sources must have a magnitude measurement in any of the optical r-bands.
  • Sources must also be detected in 4 bands at different wavelengths for a redshift to have been estimated (i.e. multiple r-band detections count only as one), including 3 optical bands (b -> y). Multiple detections in similar optical bands are not counted.

Plots for diagnostics and quality checking

Chi2 Distributions

Star-Galaxy Chi2 Comparison

Spec-z Comparison

Stats vs z

Stats vs mag

PDF Accuracy Gal

PDF Accuracy AGN