Selection of Wavelength Calibration Targets for the ACS Grism

Details Selection of Wavelength Calibration Targets for the ACS Grism Selection of Wavelength Calibration Targets for the ACS Grism

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acs..rept....9p&link_type=abstract

ST-ECF Instrument Science Report ACS 2001-009, 11 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

We discuss the criteria for the selection of wavelength calibration targets for the ACS grism to determine its dispersion and zero point. The primary requirement is for compact emission line sources. SLIM 1.0 simulations indicate that Galactic Wolf-Rayet stars are to be preferred to extragalactic Planetary Nebulae, since they can provide the wavelength calibration of both the 1st and 2nd grism orders with exposures shorter than 1 minute and are genuine point sources. Two selected targets, WR45 and WR96, were observed with NTT/EMMI at high spectral resolution (1.26 Å/pix) between 5000 Å and 1 μm. These spectra will be used as templates to identify the emission lines in the SMOV observations of the same objects using ACS, and to ultimately assess the on-orbit dispersion of the grism with an accurancy of 5% of the nominal dispersion.

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