WFC3 IR "Blobs", IR Sky Flats and the measured IR background levels

Details WFC3 IR "Blobs", IR Sky Flats and the measured IR background levels WFC3 IR "Blobs", IR Sky Flats and the measured IR background levels

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..23p&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Physics

Scientific paper

The near infrared background, as seen using the WFC3 IR channel, varies by several orders of magnitude. Ever since WFC3 was installed on HST, we have been monitoring and examining incoming observations of sparse fields. This monitoring has enabled us to identify the WFC3 IR "Blobs" (Pirzkal et al., ISR 2010-06). It has also allowed us, for a few broad band filters, to assemble IR delta sky flats. We have also been able to measure the observed IR background levels in many of the WFC3 IR filters. Here, we show how we have used WFC3 observations to construct the delta sky flats as well as how we detected and created maps of IR "Blobs". We finally show how the measurements of the IR background vary and how they correlate with HST pointing and Zodiacal light levels.

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