Absolute Calibration of Spectrophotometric Standards in the Era of Precision Cosmology

Details Absolute Calibration of Spectrophotometric Standards in the Era of Precision Cosmology Absolute Calibration of Spectrophotometric Standards in the Era of Precision Cosmology

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9116d&link_type=abstract

American Astronomical Society, AAS Meeting #211, #91.16; Bulletin of the American Astronomical Society, Vol. 39, p.886

Statistics

Methodology

Scientific paper

The unexpected discovery of dark energy independently by the Supernova Cosmology Project (Perlmutter et al, 1998) and the High-Z Supernova Team (Schmidt et al 1999) changed our perspective not only of the properties of the Universe, but also of our understanding of fundamental physics. We now know that dark energy constitutes about 70 percent of the mass-energy budget of the Universe, but we know very little about its nature.
Investigating the properties of the dark energy, and thereby distinguishing amongst the families of physical models, is the primary science goal of the proposed dark energy experiments. While the individual experiments use different approaches, they all rely on a combination of observations of two or more of: Type Ia supernovae, gravitational weak lensing, baryonic acoustic oscillation, Sunyaev-Zeldovich effect, and CMB measurements.
This places requirements on the precision of the determination of dark energy equation of state parameters (w(z) =w0 + wa(1+ z), where w = -ρ/p (density/pressure) ), corresponding to uncertainties on w0 to 0.05 and wa to 0.3 or better.
Approaches that rely on photometric measurements, e.g. the Supernovae Type Ia (SNe Ia) magnitude-redshift relation, or on photometric redshifts of galaxies (as in weak lensing) place the strongest requirements on spectrophotometry. For example, the calibration constraints set by the need to obtain multicolor light curves and peak magnitudes of SNe Ia at redshifts between z=0.3 and z=1.7 require a calibration uncertainty of 1% per filter, and 2% in color.
We describe the calibration methodology needed to ensure that the desired calibration requirements can be met and the calibration scale maintained.

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