ABSOLUTE FLUX CALIBRATION OF THE IRAC INSTRUMENT ON THE SPITZER SPACE TELESCOPE USING HUBBLE SPACE TELESCOPE FLUX STANDARDS

被引:32
作者
Bohlin, R. C. [1 ]
Gordon, K. D. [1 ]
Rieke, G. H. [2 ]
Ardila, D. [3 ]
Carey, S. [4 ]
Deustua, S. [1 ]
Engelbracht, C. [2 ]
Ferguson, H. C. [1 ]
Flanagan, K. [1 ]
Kalirai, J. [1 ]
Meixner, M. [1 ]
Noriega-Crespo, A. [4 ]
Su, K. Y. L. [2 ]
Tremblay, P. -E. [5 ]
机构
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[3] NASA, CALTECH, Herschel Sci Ctr, Pasadena, CA 91125 USA
[4] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[5] Univ Montreal, Montreal, PQ H3C 3J7, Canada
关键词
stars: atmospheres; stars: fundamental parameters; techniques: spectroscopic; SPECTRAL IRRADIANCE CALIBRATION; MULTIBAND IMAGING PHOTOMETER; INFRARED ARRAY CAMERA; MODEL ATMOSPHERES; SPECTROSCOPIC ANALYSIS; FAR-ULTRAVIOLET; WHITE-DWARFS; STARS; LINE; SPECTROPHOTOMETRY;
D O I
10.1088/0004-6256/141/5/173
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 similar to 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 mu m 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 mu m result.
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页数:12
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