Grism Sensitivities and Apparent Non-Linearity

Details Grism Sensitivities and Apparent Non-Linearity Grism Sensitivities and Apparent Non-Linearity

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nicm.rept....2b&link_type=abstract

Instrument Science Report NICMOS 2005-002, 20 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

Recent grism observations using the NICMOS instrument on HST have extended the spectrophotometric wavelength coverage of a subset of 16 STIS standard stars to ~2μm. These observations include the three primary WD standards that are used to establish the absolute sensitivities of the three grism modes. However in their overlap region at 0.8-1.0μm, the ratios of the STIS and NICMOS fluxes for brightest/faintest stars disagree by almost 25%. ACS spectrophotometry for two of the same stars in the same wavelength band agrees with STIS to 2%. A comparison of the grism spectrophotometry directly with ACS F850LP and F892N photometry for eight stars again verifies the need to correct the NICMOS grism data for non-linearity. After correction, the NICMOS grism fluxes have uncertainties ranging up to ~3% at 1.7μm. The possible effect of this newly discovered apparent non-linearity on NICMOS photometry is being investigated with new NICMOS photometric observations and by comparisons with independent IR data sets.

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