Sensitivity Monitor Report for the STIS First-Order Modes

Details Sensitivity Monitor Report for the STIS First-Order Modes Sensitivity Monitor Report for the STIS First-Order Modes

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.6211s&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #62.11; Bulletin of the American Astronomical Society, Vol. 34, p.746

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The analysis of the STIS Sensitivity Monitor observations from 1997 through 2002 continues to show sensitivity trends correlated with time for all first-order modes, as well as temperature dependence in the FUV. The mean wavelength-averaged rate of sensitivity loss for the low-resolution (L) modes is 1%/yr, with individual losses ranging from 0%/yr (G430L, G750L) to 2%/yr (G140L). Selected wavelength settings of the medium-resolution (M) gratings G140M, G230M, G230MB, G430M, and G750M have also been followed by this monitoring program. The lower exposure levels in the CCD M-mode observations result in significantly larger effects from charge transfer efficiency (CTE) losses, than is the case for the L-mode observations. In general, the sensitivity losses are found to be wavelength dependent. The limited MAMA M-mode wavelength coverage is consistent with the same sensitivity trends observed in the L modes at the corresponding wavelengths. On this basis, the STIS pipeline processing software is currently being revised to correct the extracted fluxes for these sensitivity changes in both the MAMA L and M modes. The CCD sensitivity losses due to CTE depend on the exposure level and detector location, and so require tailored corrections.

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