Calibrating a NICMOS non-linearity, the Bohlin Effect, in F160W

Details Calibrating a NICMOS non-linearity, the Bohlin Effect, in F160W Calibrating a NICMOS non-linearity, the Bohlin Effect, in F160W

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11951d&link_type=abstract

HST Proposal ID #11951. Cycle 17

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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. However, the calibration provided by the NICMOS group extends no fainter than ~10 ADU/sec. Many science applications involve the measurement of sources down to the sky limit of ~0.1 ADU/sec. An extension of this calibration in 1 of the 2 most commonly used NICMOS filters, F110W was approved as DD time for Perlmutter in program 11799. Yet as much if not more of the NICMOS science program has made use of F160W and the Bohlin effect has been shown to have a strong wavelength dependence. Therefore, we propose to perform the extension of the calibration to the levels relevant for science data in F160W.;

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