Thursday, August 25, 2011

V1 vs V2: Calibration Curves

Why did we find a factor ~1.8 in the previous post? Well, for starters we used a calibration curve that was based off of 'masking' and other tricky techniques.

The calibration curves below are the first ever produced self-consistently, i.e. using the EXACT same pipeline with the EXACT same parameters as the science data. No hacks were needed to produce these*. The recovered Volts/Jy are substantially higher than BGPSv1 and ALSO higher than the curve used about a year ago in an attempt to explain the v1 flux discrepancy.

Remember that a higher calibration curve means a LOWER recovered flux. I haven't finished the check, but odds are pretty good that applying these self-consistent cal curves will reduce the v2 data to be about 1.5.