Absolute Flux Calibration of the IRAC Instrument on the Spitzer Space Telescope Using Hubble Space Telescope Flux Standards
Creators
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1.
Space Telescope Science Institute
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2.
University of Arizona
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3.
Infrared Processing and Analysis Center
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4.
California Institute of Technology
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5.
University of Montreal
Abstract
The absolute flux calibration of the James Webb Space Telescope (JWST) will be based on a set of stars observed by the Hubble and Spitzer Space Telescopes. In order to cross-calibrate the two facilities, several A, G, and white dwarf stars are observed with both Spitzer and Hubble and are the prototypes for a set of JWST calibration standards. The flux calibration constants for the four Spitzer IRAC bands 1-4 are derived from these stars and are 2.3%, 1.9%, 2.0%, and 0.5% lower than the official cold-mission IRAC calibration of Reach et al., i.e., in agreement within their estimated errors of ~2%. The causes of these differences lie primarily in the IRAC data reduction and secondarily in the spectral energy distributions of our standard stars. The independent IRAC 8 μm band-4 fluxes of Rieke et al. are about 1.5% ± 2% higher than those of Reach et al. and are also in agreement with our 8 μm result.
Additional Information
© 2011 American Astronomical Society. Received 2011 February 10; accepted 2011 March 7; published 2011 April 7. Support for this work was provided by NASA through the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. Thanks to A. Gianninas for supplying the 60,000 K SED with CNO that appears in Figure 3.Attached Files
Published - Bohlin2011p13690Astron_J.pdf
Files
Bohlin2011p13690Astron_J.pdf
Additional details
Identifiers
- Eprint ID
- 23553
- Resolver ID
- CaltechAUTHORS:20110504-114302003
Funding
- NASA
- NAS5-26555
Dates
- Created
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2011-05-04Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)