Asymmetry Indices GIM2D calculates three classes of asymmetry indices: (1) RT and RA (Schade et al. 1995) (2) Az or do counterpart pixels have very different flux levels ? DF = nsbkg where n = 2, 3, and 5 Dz or do counterpart pixels both belong to the object ? (3) Abraham concentration (C) and asymmetry (A) indices as defined by Abraham i. e. simple pivot point and 2s isophotal area Þ Computed with circular apertures with radii that are multiples (1-10) of half-light radius Þ Statistical background correction for RT, RA, and AZ Þ Are negative values real?
GIM2D Analysis Pipeline (HST/Ground-Based)
Pre-processing Þ HST/WFPC2: "On-the-fly" recalibration pipelines (STScI or CADC) IMPORTANT: NO WMOSAIC Þ HST/NICMOS: NICPROTO package Avoid standard reduction pipeline! Cosmic Ray Rejection Þ CRREJ (HST/WFPC2) : How to pick SIGMAS levels? Þ Whatever you do, check final background pixel distribution
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