Computer Science – Performance
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21544119k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #441.19; Bulletin of the American Astronomical Society, Vol. 42, p.404
Computer Science
Performance
Scientific paper
Improvements in the precision of the astrophysical flux scale are needed to answer fundamental scientific questions ranging from cosmology to stellar physics. In particular, the precise calibration of the flux scale across the bandpass extending from 0.35 - 1.7 microns is fundamental to the precise determination of dark energy parameters based on SNeIa photometry. ACCESS - Absolute Color Calibration Experiment for Standard Stars (Kaiser et al., 2009) is a rocket-borne payload that will enable the transfer of absolute laboratory detector standards from NIST to a network of stellar standards with a calibration accuracy of 1% and a spectral resolving power of R = 500 across the 0.35-1.7 micron bandpass.
Among the strategies being employed to minimize calibration uncertainties are: (1) judicious selection of standard stars (previous calibration heritage, minimal spectral features, robust stellar atmosphere models), (2) execution of observations above the Earth's atmosphere (eliminates atmospheric contamination of the stellar spectrum), (3) a single optical path and detector (to minimize visible to NIR cross-calibration uncertainties), (4)
establishment of an a priori error budget, (5) on-board monitoring of instrument performance, and (6) fitting stellar atmosphere models to the data to search for discrepancies and enable extrapolation to wavelengths outside the ACCESS bandpass. The instrument design, calibration and observing strategy will be presented.
Support for this work was provided by NASA through grant NNX08AI65G and DOE through grant DE-FG02-07ER41506.
Benford Dominic J.
Bohlin Ralph Charles
Deustua Susana E.
Dixon William V.
Feldman Paul D.
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