Concurrent Science and Wavecal COS Data

Details Concurrent Science and Wavecal COS Data Concurrent Science and Wavecal COS Data

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..347..464h&link_type=abstract

Astronomical Data Analysis Software and Systems XIV ASP Conference Series, Vol. 347, Proceedings of the Conference held 24-27 Oc

Astronomy and Astrophysics

Astronomy

Scientific paper

Wavelength calibration for the Cosmic Origins Spectrograph (COS) is achieved by taking an exposure (a wavecal) of an internal emission-line lamp and comparing the observed location with the expected location. In order to correct for possible mechanism drifts during exposures which can be more than an hour long, a new observing mode has been proposed whereby the line lamp would be turned on briefly several times during a science exposure. This is practical because the science and wavecal spectra fall on different parts of the detector, and because COS data will normally be taken in time-tag mode, where the time and pixel coordinates are recorded for each detected photon. This paper describes the calibration of such data.

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