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Balrog matches to deep field and photo-z's » History » Version 9

Version 8 (Huan Lin, 03/21/2019 03:24 PM) → Version 9/11 (Huan Lin, 03/21/2019 03:25 PM)

h1. Balrog matches to deep field, photo-z's, field and spectro-z's photo-z's

Notes by Huan Lin, 21 Mar 2019

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h2. Matching Balrog detections to deep field coordinates

The "Balrog Run 1":https://cdcvs.fnal.gov/redmine/projects/des/wiki/Balrog_Run detected objects were matched to the "Y3 deep field coadd":https://cdcvs.fnal.gov/redmine/projects/des-y3/wiki/Y3_Deep_Coadds objects in order to obtain the original true RA and Dec of the respective parent deep field objects.

Query used on DESSCI for the Balrog/COSMOS detections:
<pre>
select y.bal_id, y.true_id, y.true_tilename, y.true_ra, y.true_dec, y.meas_cm_mag_g, y.meas_cm_mag_r,
y.meas_cm_mag_i, y.meas_cm_mag_z, y.true_cm_mag_deredden_g, y.true_cm_mag_deredden_r,
y.true_cm_mag_deredden_i, y.true_cm_mag_deredden_z, c.tilename, c.ra, c.dec
from YANNY.BALROG_MATCHED_CATALOG_FLATTEN y, Y3A2_MISC_MOF_V3_COSMOS c
where y.true_id = c.coadd_object_id and y.true_tilename like '%COSMOS%'; > balrog_cosmos.fits
</pre>

Query used on DESSCI for the Balrog/SN detections:
<pre>
select y.bal_id, y.true_id, y.true_tilename, y.true_ra, y.true_dec, y.meas_cm_mag_g, y.meas_cm_mag_r,
y.meas_cm_mag_i, y.meas_cm_mag_z, y.true_cm_mag_deredden_g, y.true_cm_mag_deredden_r,
y.true_cm_mag_deredden_i, y.true_cm_mag_deredden_z, c.tilename, c.ra, c.dec
from YANNY.BALROG_MATCHED_CATALOG_FLATTEN y, Y3A2_MISC_MOF_V1_COADD_TRUTH c
where y.true_id = c.coadd_object_id and y.true_tilename like '%SN%'; > balrog_sn.fits
</pre>

The resulting fits files are here:
* "balrog_cosmos.fits":https://cdcvs.fnal.gov/redmine/attachments/52660/balrog_cosmos.fits
* "balrog_sn.fits.gz":https://cdcvs.fnal.gov/redmine/attachments/52659/balrog_sn.fits.gz

%{color:red} *The true RA and Dec of the parent deep field objects are actually given by the columns named RA and DEC in the files above (and below).*%

h2. Matching to COSMOS/Laigle photo-z's

The Balrog/COSMOS data in "balrog_cosmos.fits":https://cdcvs.fnal.gov/redmine/attachments/52660/balrog_cosmos.fits were then matched to the "Laigle et al. (2016) high-precision photo-z catalog":http://cosmos.astro.caltech.edu/page/photoz, using the closest match within a 1-arcsec match radius. Before matching, the Laigle et al. catalog objects were first cut using the following criteria:
* FLAG_COSMOS = 1 to select the 2 deg^2 COSMOS area
* FLAG_PETER = 0 to select "good", non-masked areas
* FLAG_HJMCC = 0 to select overlap with UltraVISTA near-IR data
* TYPE = 0 to select galaxies
* ZMIN_CHI2 > 0 to select photo-z > 0

Out of the 466925 Balrog detected objects in "balrog_cosmos.fits":https://cdcvs.fnal.gov/redmine/attachments/52660/balrog_cosmos.fits, 328474 objects have a match in the (cut) Laigle et al. catalog, and the resulting matches are given in these fits file, which are *row-by-row the same objects*:
* Selected Balrog parameters in "balrog_cosmos_laigle.fits":https://cdcvs.fnal.gov/redmine/attachments/52661/balrog_cosmos_laigle.fits
* Selected Laigle et al. parameters in "laigle_balrog_cosmos.fits":https://cdcvs.fnal.gov/redmine/attachments/52662/laigle_balrog_cosmos.fits

h2. Matching to the DES SV spectroscopic training/validation sets

The Balrog data were also matched (with a 1-arcsec radius) to the spectroscopic redshifts in the "standardized training and validation sets":https://cdcvs.fnal.gov/redmine/projects/des-photoz/wiki/Photo-z_comparison_test_details#Standardized-inputs used in the DES SV photo-z paper ("Sanchez et al. 2014":https://academic.oup.com/mnras/article/445/2/1482/1406089). The results are given in the following files:
* "balrog_cosmos_match_sv_deep_std.fits":https://cdcvs.fnal.gov/redmine/attachments/52664/balrog_cosmos_match_sv_deep_std.fits gives the matches between Balrog/COSMOS detected objects and the SV "deep" training+validation sample (the resulting matches come primarily from the zCOSMOS Bright survey)
* "balrog_sn_match_sv_main_std.fits":https://cdcvs.fnal.gov/redmine/attachments/52663/balrog_sn_match_sv_main_std.fits gives the matches between Balrog/SN detected objects and the SV "main" training+validation sample