SMOV Absolute Flux Calibration of the COS FUV Modes

Details SMOV Absolute Flux Calibration of the COS FUV Modes SMOV Absolute Flux Calibration of the COS FUV Modes

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cos..rept....2m&link_type=abstract

Instrument Science Report COS 2010-02(v1), 13 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Cos, Cosmic Origins Spectrograph

Scientific paper

Point source sensitivity curves are determined for the COS FUV gratings: G140L, G130M and G160M. Observations through the Primary Science Aperture (PSA) were obtained of the standard star LDS749b for all central wavelength settings of all the gratings. In addition, PSA observations of the standard stars WD1057+729 and GD71 were obtained at selected settings. Further, observations of the standard star GD71 were also obtained at selected settings through the Bright Object Aperture (BOA), in order to characterize its transmission and, hence, the COS sensitivity using the BOA. The accuracy of the calibration is estimated to be 5%. Issues limiting the current accuracy and approaches to address them are discussed.

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