Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11933r&link_type=abstract
HST Proposal ID #11933. Cycle 17
Other
Scientific paper
The NICMOS non-linearity known as the Bohlin Effect has revealed that the apparent flux of a source observed by NICMOS is not a simple, linear function of count rate. The effect has been characterized by observations of star clusters observed with and without additional background from the internal lamps. As WFC3 lacks internal lamps which can be used to add background, we will rely on the bright Earth limb to provide additional background. We will observe a star cluster, 47 Tuc, repeatedly throughout a complete HST orbit which has been chosen to put the closest approach to the bright Earth to be 13.5 degrees, the closest approach allowed while retaining FGS guiding. Another set will be done with the BE limb closest approach of 15.5 degrees. The observations will be done with the two most commonly used filters, F110W and F160W and at two different bright Earth limb angles to test the linearity of the non-linearity. We have also included an orbit on NGC 1850 to repeat the NICMOS field for which the linearity of the field has been established.;
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