Index: trunk/doc/release.2015/systematics.20140411/antilogus.etal.bib =================================================================== --- trunk/doc/release.2015/systematics.20140411/antilogus.etal.bib (revision 40473) +++ trunk/doc/release.2015/systematics.20140411/antilogus.etal.bib (revision 40473) @@ -0,0 +1,14 @@ + + +@article{1748-0221-9-03-C03048, + author={P Antilogus and P Astier and P Doherty and A Guyonnet and N Regnault}, + title={The brighter-fatter effect and pixel correlations in CCD sensors}, + journal={Journal of Instrumentation}, + volume={9}, + number={03}, + pages={C03048}, + url={http://stacks.iop.org/1748-0221/9/i=03/a=C03048}, + year={2014}, + abstract={We present evidence that spots imaged using astronomical CCDs do not exactly scale with flux: bright spots tend to be broader than faint ones, using the same illumination pattern. We measure that the linear size of spots or stars, of typical size 3 to 4 pixels FWHM, increase linearly with their flux by up to 2 % over the full CCD dynamic range. This brighter-fatter effect affects both deep-depleted and thinned CCD sensors. We propose that this effect is a direct consequence of the distortions of the drift electric field sourced by charges accumulated within the CCD during the exposure and experienced by forthcoming light-induced charges in the same exposure. The pixel boundaries then become slightly dynamical: overfilled pixels become increasingly smaller than their neighbors, so that bright star sizes, measured in number of pixels, appear larger than those of faint stars. This interpretation of the brighter-fatter effect implies that pixels in flat-fields should exhibit statistical correlations, sourced by Poisson fluctuations, that we indeed directly detect. We propose to use the measured correlations in flat-fields to derive how pixel boundaries shift under the influence of a given charge pattern, which allows us in turn to predict how star shapes evolve with flux. We show that, within the precision of our tests, we are able to quantitatively relate the correlations of flat-field pixels and the broadening of stars with flux. This physical model of the brighter-fatter effect also explains the commonly observed phenomenon that the spatial variance of CCD flat-fields increases less rapidly than their average.} +} + Index: trunk/doc/release.2015/systematics.20140411/gruen.etal.bib =================================================================== --- trunk/doc/release.2015/systematics.20140411/gruen.etal.bib (revision 40473) +++ trunk/doc/release.2015/systematics.20140411/gruen.etal.bib (revision 40473) @@ -0,0 +1,14 @@ + + +@article{1748-0221-10-05-C05032, + author={D. Gruen and G.M. Bernstein and M. Jarvis and B. Rowe and V. Vikram and A.A. Plazas and S. Seitz}, + title={Characterization and correction of charge-induced pixel shifts in DECam}, + journal={Journal of Instrumentation}, + volume={10}, + number={05}, + pages={C05032}, + url={http://stacks.iop.org/1748-0221/10/i=05/a=C05032}, + year={2015}, + abstract={Interaction of charges in CCDs with the already accumulated charge distribution causes both a flux dependence of the point-spread function (an increase of observed size with flux, also known as the brighter/fatter effect) and pixel-to-pixel correlations of the {Poissonian} noise in flat fields. We describe these effects in the Dark Energy Camera (DECam) with charge dependent shifts of effective pixel borders, i.e. the Antilogus et al. (2014) model, which we fit to measurements of flat-field {Poissonian} noise correlations. The latter fall off approximately as a power-law r −2.5 with pixel separation r , are isotropic except for an asymmetry in the direct neighbors along rows and columns, are stable in time, and are weakly dependent on wavelength. They show variations from chip to chip at the 20% level that correlate with the silicon resistivity. The charge shifts predicted by the model cause biased shape measurements, primarily due to their effect on bright stars, at levels exceeding weak lensing science requirements. We measure the flux dependence of star images and show that the effect can be mitigated by applying the reverse charge shifts at the pixel level during image processing. Differences in stellar size, however, remain significant due to residuals at larger distance from the centroid.} +} + Index: trunk/doc/release.2015/systematics.20140411/proof.txt =================================================================== --- trunk/doc/release.2015/systematics.20140411/proof.txt (revision 40473) +++ trunk/doc/release.2015/systematics.20140411/proof.txt (revision 40473) @@ -0,0 +1,49 @@ + +Please find herein my corrections to the proof: + +Answers to the questions: + +* Q1: country name for affiliations 1 & 2 : country is USA for both. + +* Q2 : check references without a link: + + * Chambers et al 2016 : http://adsabs.harvard.edu/abs/2016arXiv161205560C + * Flewelling et al 2016 : http://adsabs.harvard.edu/abs/2016arXiv161205243F + * Hodapp et al 2004 : http://adsabs.harvard.edu/abs/2004SPIE.5489..667H, https://doi.org/10.1117/12.550179 + * Holland et al 1996 + * Magnier 2006 : + * Magnier, Chambers, Flewelling et al 2016 X : http://adsabs.harvard.edu/abs/2016arXiv161205240M [data system] + * Magnier, Sweeney, Chambers et al 2016 Y : http://adsabs.harvard.edu/abs/2016arXiv161205244M [analysis (psphot)] + * Magnier, Schlafly, Finkbeiner et al 2016 Z : http://adsabs.harvard.edu/abs/2016arXiv161205242M [calibration] + * Tonry & Onaka 2009 + * Tonry et al 2006 + * Waters et al 2016 : http://adsabs.harvard.edu/abs/2016arXiv161205245W + +* Q3 : publisher details for 3 references: + + Hodapp et al 2004 : publisher is SPIE + Janesick \& Elliott 1992 : publisher is Astronomical Society of the Pacific + Magnier 2007 : publisher is Astronomical Society of the Pacific + +* Q4 : volume & page number for 3 refs + + Magnier 2006, The Advanced Maui Optical and Space Surveillance Technologies Conf., Vol 2, Page 455. + Publisher: Maui Economic Development Board + + Tonry et al 2006, The Advanced Maui Optical and Space Surveillance Technologies Conf., Vol 1, Page 439. + Publisher: Maui Economic Development Board + + Tonry & Onaka 2009, The Advanced Maui Optical and Space Surveillance Technologies Conf., Vol 1, Page 364. + Publisher: Maui Economic Development Board + +* Q5 : update refs to arxiv if possible + +------ + +Other Notes: + +P. 13 References: + +Antilogus et al 2014 has a floating comma after the journal (JInst) + +Gruen et al 2015 has an extra space after the journal (JInst)