Flux Calibration of the Cosmic Origins Spectrograph

Details Flux Calibration of the Cosmic Origins Spectrograph Flux Calibration of the Cosmic Origins Spectrograph

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725402p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #254.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We review the current status of the flux calibration of the Cosmic Origins Spectrograph (COS). The absolute flux calibration is ultimately tied to model atmosphere calculations for well studied DA white dwarf standards, but in practice a number of other effects have to be taken into account to properly calibrate individual observations. These include the time dependent throughput changes of each mode, variations of throughput with central wavelength setting, flatfielding issues, centering in the aperture, vignetting, and changes in detector gain. We discuss our understanding of each of these issuses, how these effects can be corrected during calibration of COS data, and our plans for monitoring and improving the flux calibration of COS in the future.

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