Wavelength Calibration of the Cosmic Origins Spectrograph

Details Wavelength Calibration of the Cosmic Origins Spectrograph Wavelength Calibration of the Cosmic Origins Spectrograph

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546412o&link_type=abstract

American Astronomical Society, AAS Meeting #215, #464.12; Bulletin of the American Astronomical Society, Vol. 42, p.500

Physics

Optics

Scientific paper

The Cosmic Origins Spectrograph (COS) was installed during the most recent servicing mission of the Hubble Space Telescope. The FUV channel, 10 to 30 times more sensitive than STIS, covers the wavelength range from 1150 to 1800 A with the medium resolution gratings (G130M/G160M) and from 900 to 2400 A with the low resolution grating (G140L). The medium resolution gratings in the NUV channel (G185M/G225M/G285M) cover 1700 to 3200 A, while the low resolution grating (G230L) covers 1700 to 3200 A.
We describe the wavelength calibration of the FUV and NUV channels, which uses a combination of ground and on-orbit data obtained during SMOV. We consider the effect of drift of the Optics Select Mechanisms (OSM) on the wavelength scales and describe how the onboard wavecal lamps allow us to correct for the OSM drift.
We report the accuracy achieved with the current wavelength calibration strategy and summarize our cycle 17 wavelength calibration plans.

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