Other
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acs..rept....1k&link_type=abstract
ST-ECF Instrument Science Report ACS-2008-01, 20 pages
Other
Hubble Space Telescope, Hst, Space Telescope Science Institute, Acs, Advanced Camera For Surveys
Scientific paper
A revised flux calibration is presented for the G800L grism with the ACS WideField Channel. The calibrations were derived from observations of the HST standard star G191B2B and cross-checked with observations of the standard star GD153. The absolute flux calibration of the 1st order is accurate to better than 2% for wavelengths from 6000 to 9500 Å at the spatial positions covered in this ISR.The updated flux calibration file shows differences of less than 5% to the previousone and is made available to users as configuration files for the aXe software package. Furthermore, the spectral resolving power for point sources observed with the G800L grism (1st order) was measured to be 100±20 Å (FWHM) at 6563Å. The flux calibration of other orders, which are currently not used for scientific purposes, is also updated.In an investigation of the fringing properties of the WFC CCDs the contribution of fringing to the total error of the flux calibration is examined. Using a Gaussian model of 100 Å (FWHM) for the relative distribution of light falling onto a given CCD pixel (the so called pixel throughput function), we demonstrate that the error due to fringing amounts to less than 0.1% for continuum sources and can therefore be neglected. For narrow emission lines fringing can cause in principle line flux variations of 12% and more. For more realistic scenarios as in the case of emission lines in a Wolf Rayet star we measure variations of order 4%.
Kümmel Martin
Kuntschner Harald
Walsh Jonathan R.
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