COS Target Acquisition Guidelines and Bright Object Protection Rules

Details COS Target Acquisition Guidelines and Bright Object Protection Rules COS Target Acquisition Guidelines and Bright Object Protection Rules

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113505s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #135.05; Bulletin of the American Astronomical Society, Vol. 39, p.972

Astronomy and Astrophysics

Astronomy

Scientific paper

The Cosmic Origins Spectrograph will provide unparalleled high sensitivity spectroscopy of faint ultraviolet sources. To effectively utilize the unique capabilities of COS, target selection and acquisitions should be carefully planned.
Acquisitions of faint objects with COS will typically use the NUV imaging mode. For brighter sources, spiral search and peakup acquisition modes are available for both FUV and NUV. We highlight guidelines and strategies for observers to craft target acquisitions with all modes and how to choose between them. Based upon COS Exposure Time Calculator (ETC) modeling, we illustrate the time requirements for different target acquisition scenarios.
To preserve the health and safety of COS detectors, separate bright object protection rules have been created for each detector. We explain these rules and their implications for potential COS targets and users. Most science observations will be performed in TIME-TAG mode in which individual photon arrival times and locations are recorded. This mode is preferred because it allows for optimized data reduction. Brighter objects that produce high count rates must be handled by using ACCUM mode that collects photons only by location on the detector. We discuss the count rate limits and specific data quality considerations of each mode.

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