Claire Cramer
(NIST)
18/04/2012, 13:00
Overview
I will discuss NIST's effort to create a catalog of SI-traceable spectrophotometric standard stars. Our work builds on advances in optical metrology and atmospheric monitoring made since the previous set of ground-based calibrations were done roughly thirty years ago. NIST's state-of-the art standards at visible wavelengths are now detector-based rather than source-based. I will explain how...
Prof.
Peter Zimmer
(University of New Mexico)
18/04/2012, 14:00
Paper
The UNM Measurement Astrophysics group is currently constructing and testing a mobile instrument suite that includes a multi-wavelength backscatter lidar, stellar spectroradiometer and cameras (visible and thermal infrared) that will provide real-time atmospheric transmission metadata in the column of atmosphere through which the supported telescope is observing. The design, operation and...
John Marriner
(FNAL)
18/04/2012, 14:20
Impact of calibration errors on astrophysics parameters
Experience with the SDSS calibration applied to SDSS SN will be described.
Dr
Marc Betoule
(LPNHE CNRS IN2P3)
18/04/2012, 14:40
Impact of calibration errors on astrophysics parameters
With around 1 thousand type-Ia supernovae populating the Hubble
diagram, the uncertainty of the photometric calibration of the survey
now limits the precision of the cosmological parameters. We first
present the method used to establish a uniform photometric response of
the MegaCam instrument from CFHT used for SNLS. We then present a joint effort of the SNLS and SDSS collaborations to...
Dr
Nicolas Regnault
(LPNHE (Paris))
18/04/2012, 15:00
Calibration of instruments/telescopes before and after deployment
Dark Energy studies with type Ia supernovae set very tight constraints on the photometric calibration of the imagers used to detect the supernovae and follow them up. Among the key challenges is the measurement of the shape and normalization of the instrumental throughput. In particular, it is absolutely vital to control the flux intercalibration of the imager passbands.
The DICE system...