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

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2505g&link_type=abstract

American Astronomical Society, AAS Meeting #212, #25.05; Bulletin of the American Astronomical Society, Vol. 40, p.223

Astronomy and Astrophysics

Astronomy

Scientific paper

The Cosmic Origins Spectrograph will provide spectroscopy of faint ultraviolet sources with unparalleled sensitivity. However, careful planning is required to effectively utilize the unique capabilities of COS. Faint object acquisition with COS will typically utilize the Near-UV (NUV) imaging mode. For brighter sources, spiral search and peakup acquisition modes are available for both the NUV and Far-UV (FUV). Here we highlight guidelines and strategies for observers to craft target acquisitions in all modes and describe 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 (TTAG) 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 accumulation (ACCUM) mode that collects photons according to their location on the detector. For each observation mode we discuss the count rate limits and specific data quality considerations.

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