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    block this user An-Ping Li

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    Beijing 100085, P.R.China

    Selection of Wavelength Calibration Targets for the ACS Grism

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    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 1 st and 2 nd 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 /pix) between 5000 and 1 m. 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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    Description

    Title : Selection of Wavelength Calibration Targets for the ACS Grism
    Abstract : 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 1 st and 2 nd 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 /pix) between 5000 and 1 m. 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.
    Subject : unspecified
    Area : Mathematics
    Language : English
    Affiliations
    Url : http://hst.stsci.edu/acs/documents/isrs/isr0109.pdf
    Doi : 10.1.1.23.3979

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    An-Ping's Peer Evaluation activity

    Emailed by 1
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