Time-Dependence in MIPS 160 Micron Sky Background Measurements

Details Time-Dependence in MIPS 160 Micron Sky Background Measurements Time-Dependence in MIPS 160 Micron Sky Background Measurements

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345205g&link_type=abstract

American Astronomical Society, AAS Meeting #213, #452.05; Bulletin of the American Astronomical Society, Vol. 41, p.348

Astronomy and Astrophysics

Astronomy

Scientific paper

While the fast response behavior of the Spitzer Observatory MIPS 160 µm stressed GE detector array is well understood, yielding exceptional results for bright or point sources, the slow response and response to background is not as well understood. The modeling of this behavior in such devices remains controversial. We analyzed 54 AOR contiguous observations of the Lockman Hole low-cirrus region. We examined data that re-measured the same sky pixel on the same to very different scan paths, and separated in time by hours to years. We found an exponential time-dependent response component affecting most of the data, with a typical amplitude of -0.2 to -0.4 MJy/Sr and a time constant of about 400 DCE periods (roughly 1600 seconds). Further, we found that the amplitude of the effect is correlated with the time since anneal.
These results suggest that part of the characterization process of all such devices should include the observation of a large, low-cirrus field in multiple crossing scans to determine the time constant and post-anneal properties of the instrument. Doing so would improve the sensitivity of faint low-surface brightness object measurements, especially in surveys, by improving local background level uncertainty, as well as improve measurements of the cosmic far-IR background.
Support by the Spitzer GO program is gratefully acknowledged.

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