Improved Wavelengths Calibration of SBC Prisms

Details Improved Wavelengths Calibration of SBC Prisms Improved Wavelengths Calibration of SBC Prisms

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11323k&link_type=abstract

HST Proposal ID #11323. Cycle 16

Physics

Scientific paper

We propose to check and improve the wavelength calibration of the SBC PR110L and PR130L prisms by observing an additional calibrator target for which observations failed in Cycle 14. Previous calibration programmes included two QSOs at redshifts z = 0.098 PG1404+226, z = 0.168 PG1322+659, and z=0.234 PB5723, but the observation of a further QSO at z = 0.313 3C249.1 failed. This proposals aims to obtain observations of 3C249.1. The observations of PB5723 show adequate agreement of the wavelength of the Lyman alphaline as a function of position but, while the rms is around 0.5 pixel, some spectra show evidence of stretching of the wavelength scale. Given the steeply increased use of the SBC prims in Cycle 16 it is desirable to obtain additional observations in order to check the existing calibration, identify any trends with time and thus improve the SBC prism wavelength calibration.;

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