[KIDS] QC coadds for KiDS-INT-DR2

Sun Dec 2 03:37:24 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).
Also is attached a file with tile min, max and max-min median
magnitude differences between SDSS and KIDS. The last column (max-min)
gives and indication about the biggest difference of a median filtered
magnitude variation compared to SDSS.
In particular for the flagged zero coadds we have:
				dec		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
As bonus track in the next mail you will get an animated gif of such plots.
Also we evaluate the

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Aniello Grado, PhD

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

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