Addendum: GLIMPSE Validation Report
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چکیده
In our Validation Report of Jan. 30, 2004, we produced reliability calculations and discussed photometric accuracy estimates based on Observing Strategy Validation (OSV) data and an early version of the GLIMPSE post-BCD pipeline reduction package. We showed that GLIMPSE could produce a catalog of point sources with reliability ≥99.5% and photometric accuracies better than 0.2 mag in all IRAC bands if we excluded regions of complex diffuse background emission >56 MJy/str (>1.9 mJy/pixel) in IRAC band [8.0]. However, we noted that we were experimenting with source extraction techniques that had the potential to more reliably extract point sources in bright and spatially variable diffuse emission regions. In the meantime, the GLIMPSE team has developed a robust extraction technique that delivers high reliablity, completeness, and photometric accuracy using only two observations per IRAC band of each point in the GLIMPSE survey area with no restrictions on diffuse emission brightness level. The GLIMPSE post-BCD pipeline now provides high quality results over the entire range of diffuse emission brightness and stellar densities encountered in the OSV field. We report the results of these developments here in the form of amended reliability and photometric accuracy plots. The two key developments are: 1) implementation in the GLIMPSE point source extractor of an iterative median smoothing of diffuse emission; and, 2) changing the criterion for the internal truth table from 8 detections in a band or an adjacent band to 7 detections in a band or an adjacent band (7 or 7 criterion).
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