HST/WFC3 flux calibration ladder: Vega

Susana E. Deustua; Ralph Bohlin; Nor Pirzkal; John MacKenty

doi:10.1117/12.2056558

28 August 2014 HST/WFC3 flux calibration ladder: Vega

Susana E. Deustua, Ralph Bohlin, Nor Pirzkal, John MacKenty

Proceedings Volume 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave; 91433G (2014) https://doi.org/10.1117/12.2056558
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Vega is one of only a few stars calibrated against an SI-traceable blackbody, and is the historical flux standard. Photometric zeropoints of the Hubble Space Telescope’s instruments rely on Vega, through the transfer of its calibration via stellar atmosphere models to the suite of standard stars. HST’s recently implemented scan mode has enabled us to develop a path to an absolute SI traceable calibration for HST IR observations. To fill in the crucial gap between 0.9 and 1.7 micron in the absolute calibration, we acquired -1st order spectra of Vega with the two WFC3 infrared grisms. At the same time, we have improved the calibration of the -1st orders of both WFC3 IR grisms, as well as extended the dynamic range of WFC3 science observations by a factor of 10000. We describe our progress to date on the WFC3 ‘flux calibration ladder’ project to provide currently needed accurate zeropoint measurements in the IR

Citation Download Citation

Susana E. Deustua, Ralph Bohlin, Nor Pirzkal, and John MacKenty "HST/WFC3 flux calibration ladder: Vega", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91433G (28 August 2014); https://doi.org/10.1117/12.2056558

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