DECal: A Spectrophotometric Calibration System For DECam.

Details DECal: A Spectrophotometric Calibration System For DECam. DECal: A Spectrophotometric Calibration System For DECam.

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924802r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #248.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results for a spectrophotometric calibration system that is being implemented as part of the DES DECam project at the Blanco 4 meter at CTIO. Our calibration system uses a 2nm wide tunable source to measure the instrumental response function of the telescope from 300nm up to 1100nm. This calibration will be performed regularly to monitor any change in the transmission function. The system consists of a monochromator based tunable light source that provides illumination on a dome flat that is monitored by calibrated photodiodes and allow us to measure the throughput as a function of wavelength. Our system has an output power of 2 mW, equivalent to a flux of approximately 800 photons/s/pixel on DECam. Preliminary results of the measure of the throughput of the telescope will be presented.

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