[KIDS] QC coadds for KiDS-INT-DR2

aniello grado aniello.grado at gmail.com
Sun Dec 2 03:51:53 CET 2012 

 Dear Gijs and Jelte,

 As agreed in the last teleconf we made the comparison between SDSS
 (catalogs provided by Mario) and KIDS catalogues (from the catalogs
 group) for the coadds flagged as zero.  For the SDSS we adopt the
 psfmag beeing interested in comparing stars magnitudes. For the KIDS
 we adopt the aperture magnitude at 20 pixels,  an aperture corrections
 was calculated as the difference between mag_auto and mag_aper for the
 stars with magnitude between 16 and 17. This is indeed a very crude
 aperture correction and somehow arbitrary choice but in this way we
 have a consistent view of systematic offset between SDSS and KIDS.
 Clearly the final test would be to evaluate PSF magnitudes on KIDS!!
 The range in ra and dec was divided in 25 intervals and the median of
 the magnitudes difference between SDSS and KIDS was calculated.
 We select high signal to noise stars  which have a psfmagerr < 0.03.
 Indeed we perform the tests for all the 52 coadds and this is what you
 get in the attached tar.
 The first plot shows the delta mag as function of RA. Overplotted is
 the line interpolating the median values. The same as function of DEC.
 The last plot shows in arbitrary colors the deltamag vs RA and DEC
 (just to have a 2D impression of systematics trends).
As bonus track in the next mail you will get an animated gif of such
plots (too big to be attached here).

 Also is attached a file with tile_name min, max and max-min median
 magnitude differences between SDSS and KIDS. The last column (max-min)
 gives an indication about the biggest difference of a median filtered
 magnitude variation in the field of view compared to SDSS. The file
is ordered as increasing (max-min).
 In particular for the flagged zero coadds we have:

                                vs  dec           vs  ra
 KIDS_139.0_-1.5_i    0.026           0.019
 KIDS_184.0_-1.5_i    0.039           0.029
 KIDS_184.0_1.5_u    0.048           0.050
 KIDS_184.0_1.5_i     0.022           0.037
 KIDS_185.0_-1.5_r    0.035          0.048
 KIDS_186.0_-0.5_u   0.040          0.044
 KIDS_186.0_0.5_i     0.029          0.043

This indicate that for the flag=0 coadds there are no big problems
from a photometric point of view. Other tests on limiting magnitudes
in particular regions or morphological studies on galaxies in such
regions should be performed.  Also should be noted that for some u
band coadds a big max deviation is found. This is due to problems in
the SDSS catalog. A simple check like psfmag vs RA and DEC shows a
region where the mags jump by 5-6 mags. In those regions the psfmagerr
is anomalous big (~1 mag) but still to small compared to the true
systematic error.

 Fedor and Lino


> Also we evaluate the
>
> --
> <<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>
>
> Aniello Grado, PhD
>
> Ricercatore Astronomo
> INAF- Osservatorio Astronomico di Capodimonte
> Via Moiariello 16 80131 Napoli
> ITALIA
> Tel: 0039 0815575547
> Fax: 0039 0815575433
>
> <<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>



-- 
<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>

Aniello Grado, PhD

Ricercatore Astronomo
INAF- Osservatorio Astronomico di Capodimonte
Via Moiariello 16 80131 Napoli
ITALIA
Tel: 0039 0815575547
Fax: 0039 0815575433

<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>
-------------- next part --------------
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 kids2sdss_186_-0.5_r.dmagmed_dec.cat -0.031 -0.013 0.018
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 kids2sdss_184_0.5_g.dmagmed_dec.cat -0.025 -0.002 0.022
 kids2sdss_184_1.5_i.dmagmed_dec.cat -0.054 -0.032 0.022
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 kids2sdss_185_1.5_r.dmagmed_dec.cat -0.010 0.014 0.024
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 kids2sdss_131_-1.5_r.dmagmed_dec.cat -0.013 0.013 0.026
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 kids2sdss_184_-0.5_i.dmagmed_dec.cat -0.056 -0.027 0.028
 kids2sdss_185_1.5_r.dmagmed_ra.cat -0.014 0.014 0.028
 kids2sdss_186_0.5_r.dmagmed_dec.cat -0.035 -0.008 0.028
 kids2sdss_139_-1.5_u.dmagmed_ra.cat -0.039 -0.010 0.029
 kids2sdss_184_-1.5_i.dmagmed_ra.cat -0.059 -0.029 0.029
 kids2sdss_185_1.5_i.dmagmed_dec.cat -0.061 -0.031 0.029
 kids2sdss_185_-1.5_i.dmagmed_ra.cat -0.049 -0.020 0.029
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 kids2sdss_186_0.5_r.dmagmed_ra.cat -0.031 -0.002 0.029
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 kids2sdss_185_0.5_r.dmagmed_dec.cat -0.036 -0.005 0.031
 kids2sdss_131_-1.5_u.dmagmed_dec.cat -0.039 -0.007 0.032
 kids2sdss_184_-0.5_u.dmagmed_ra.cat -0.075 -0.042 0.032
 kids2sdss_131_-1.5_g.dmagmed_ra.cat -0.031 0.002 0.033
 kids2sdss_184_0.5_i.dmagmed_dec.cat -0.036 -0.004 0.033
 kids2sdss_184_-1.5_g.dmagmed_ra.cat -0.042 -0.009 0.033
 kids2sdss_185_-0.5_i.dmagmed_dec.cat -0.043 -0.010 0.033
 kids2sdss_185_-1.5_g.dmagmed_dec.cat -0.028 0.006 0.033
 kids2sdss_186_-0.5_i.dmagmed_dec.cat -0.043 -0.009 0.033
 kids2sdss_185_1.5_i.dmagmed_ra.cat -0.061 -0.027 0.034
 kids2sdss_186_-0.5_r.dmagmed_ra.cat -0.037 -0.003 0.034
 kids2sdss_131_-1.5_i.dmagmed_dec.cat -0.055 -0.020 0.035
 kids2sdss_139_-1.5_g.dmagmed_ra.cat -0.050 -0.015 0.035
 kids2sdss_185_-1.5_r.dmagmed_dec.cat -0.068 -0.033 0.035
 kids2sdss_186_-0.5_i.dmagmed_ra.cat -0.042 -0.007 0.035
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 kids2sdss_185_0.5_i.dmagmed_ra.cat -0.047 -0.011 0.036
 kids2sdss_184_-0.5_u.dmagmed_dec.cat -0.071 -0.034 0.037
 kids2sdss_184_1.5_i.dmagmed_ra.cat -0.056 -0.020 0.037
 kids2sdss_185_1.5_g.dmagmed_ra.cat -0.044 -0.007 0.037
 kids2sdss_131_-1.5_r.dmagmed_ra.cat -0.015 0.023 0.038
 kids2sdss_184_1.5_r.dmagmed_dec.cat -0.053 -0.015 0.038
 kids2sdss_185_0.5_g.dmagmed_dec.cat -0.034 0.003 0.038
 kids2sdss_185_0.5_u.dmagmed_dec.cat 0.001 0.040 0.038
 kids2sdss_185_0.5_u.dmagmed_ra.cat 0.001 0.039 0.038
 kids2sdss_131_-1.5_i.dmagmed_ra.cat -0.054 -0.015 0.039
 kids2sdss_135_-1.5_g.dmagmed_ra.cat -0.034 0.005 0.039
 kids2sdss_184_-1.5_i.dmagmed_dec.cat -0.065 -0.027 0.039
 kids2sdss_185_1.5_u.dmagmed_dec.cat -0.074 -0.033 0.040
 kids2sdss_186_-0.5_u.dmagmed_dec.cat -0.016 0.024 0.040
 kids2sdss_185_-0.5_i.dmagmed_ra.cat -0.049 -0.009 0.041
 kids2sdss_185_-1.5_i.dmagmed_dec.cat -0.063 -0.022 0.041
 kids2sdss_184_0.5_r.dmagmed_ra.cat -0.043 -0.002 0.042
 kids2sdss_185_-1.5_u.dmagmed_ra.cat -0.055 -0.013 0.042
 kids2sdss_184_0.5_i.dmagmed_ra.cat -0.047 -0.004 0.043
 kids2sdss_185_0.5_i.dmagmed_dec.cat -0.048 -0.005 0.043
 kids2sdss_186_0.5_i.dmagmed_ra.cat -0.055 -0.012 0.043
 kids2sdss_186_-0.5_u.dmagmed_ra.cat -0.011 0.033 0.044
 kids2sdss_184_-0.5_g.dmagmed_ra.cat -0.034 0.011 0.045
 kids2sdss_184_1.5_g.dmagmed_dec.cat -0.037 0.008 0.045
 kids2sdss_184_-1.5_r.dmagmed_dec.cat -0.079 -0.034 0.045
 kids2sdss_186_-0.5_g.dmagmed_dec.cat -0.028 0.016 0.045
 kids2sdss_184_1.5_g.dmagmed_ra.cat -0.037 0.009 0.046
 kids2sdss_185_-0.5_r.dmagmed_ra.cat -0.070 -0.024 0.046
 kids2sdss_184_0.5_g.dmagmed_ra.cat -0.033 0.014 0.047
 kids2sdss_184_-1.5_g.dmagmed_dec.cat -0.041 0.007 0.048
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 kids2sdss_185_1.5_u.dmagmed_ra.cat -0.073 -0.024 0.048
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 kids2sdss_184_0.5_u.dmagmed_dec.cat -0.066 -0.013 0.053
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 kids2sdss_139_-1.5_u.dmagmed_dec.cat -0.054 0.000 0.054
 kids2sdss_184_-0.5_r.dmagmed_ra.cat -0.051 0.003 0.055
 kids2sdss_185_-1.5_u.dmagmed_dec.cat -0.065 -0.010 0.055
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 kids2sdss_184_1.5_r.dmagmed_ra.cat -0.067 -0.010 0.057
 kids2sdss_184_0.5_u.dmagmed_ra.cat -0.070 -0.012 0.058
 kids2sdss_185_0.5_g.dmagmed_ra.cat -0.055 0.004 0.059
 kids2sdss_185_-0.5_g.dmagmed_ra.cat -0.135 -0.076 0.059
 kids2sdss_186_0.5_u.dmagmed_ra.cat -0.063 -0.004 0.059
 kids2sdss_186_0.5_g.dmagmed_dec.cat -0.057 0.005 0.062
 kids2sdss_186_0.5_g.dmagmed_ra.cat -0.057 0.006 0.063
 kids2sdss_186_0.5_u.dmagmed_dec.cat -0.075 -0.002 0.072
 kids2sdss_184_-1.5_u.dmagmed_dec.cat -0.050 0.025 0.075
 kids2sdss_135_-1.5_u.dmagmed_ra.cat -0.056 0.021 0.077
 kids2sdss_135_-1.5_u.dmagmed_dec.cat -0.045 0.102 0.147
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