Characterizing the astrometric errors in the Gaia catalogue Berry Holl

Location estimation in presence of radiation damaget l → t 1 ,t 2 ,...,t 720Fitting ‘damaged’ observations with:Location bias [pixels]undamaged LSF0.160.140.120.100.080.060.040.02Trap density = 1 trap/pixel:backgroundno backgroundExperimental data CI delay 1 sColours: different profile widths13 14 15 16 17 18 19 20GProdʼhomme & Holl et al. (2011)108642[mas]undamaged LSF perturbed byCharge Distortion Model (CDM)Location bias [pixels]0.030.020.010CTI-freeoptimal CDMCDMred: 4 traps/pixel1.51.00.5−0.01 black:−0.51 trap/pixel−1.0−0.0213 14 15 16 17 18 19 20G049[mas]Effect of image location errors on astrometryInput pattern observation bias:Location bias, δ max [mas]3.02.52.01.51.00.50Standard deviation [mas]−0.50.213 14 15 16 17 18 19 20G210.5Full damageMitigatedCTI-freeResiduals pattern after AGIS:Mean time residual [mas]3210−1−2−3Can use residualpattern to ‘correct’observations!−413 14 15 16 17 18 19 20Gt 1,t 2,...,t 72013 14 15 16 17 18 19 20G...,α, δ, ,µ α∗,µ δ, σ α∗, ρ αδ, σ δ,...Holl & Prodʼhomme et al. (2012)50