Time-Dependent Sensitivity of the CCD and MAMA First- Order Modes

Details Time-Dependent Sensitivity of the CCD and MAMA First- Order Modes Time-Dependent Sensitivity of the CCD and MAMA First- Order Modes

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004stis.rept....4s&link_type=abstract

Instrument Science Report STIS 2004-04, 27 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

Analysis of the STIS Sensitivity Monitor observations from 1997 through March 2004 continues to show sensitivity trends correlated with time for all first-order modes, as well as temperature dependence in both the FUV MAMA and CCD detectors. The well-known sensitivity of the FUV MAMA to temperature has been reaffirmed at -0.265 %/degC, while new sensitivities to temperature of +0.33 and +0.20 %/degC for G230LB and G430L have arisen since the switch to the Side-2 electronics in July 2001. After these temperature corrections are applied, rates of sensitivity loss are seen to have slowed down significantly in the last epoch of observation beginning in early 2002. During this time, sensitivity losses range from 0.2-1.3 %/yr for G140L and 0-1.0 %/yr for G230L. Previously, CCD sensitivity trends were confused by CTE losses, an effect that is now well characterized. CCD sensitivity losses in the last epoch range from 0.2-0.7 %/yr for G230LB to 0.1-0.3 %/yr for G430L to 0-0.2 %/yr for G750L. Selected wavelength settings of the medium-resolution (M) gratings G140M, G230M, G230MB, G430M, and G750M have also been followed by this monitoring program. Sensitivity trends measured for the limited M-mode wavelength coverage are similar to those observed in the L-modes at corresponding wavelengths. On this basis, the STIS pipeline processing software properly accounts for time-dependent sensitivity (TDS) trends for the MAMA and CCD L- and M-modes. Additionally, SYNPHOT and the STIS exposure time calculators (ETCs) have implemented TDS trends for firstorder spectroscopy.

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