Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80062a&link_type=abstract
Spitzer Proposal ID #80062
Physics
Scientific paper
Analyses of the backgrounds in previous deep IRAC observations have revealed the presence of spatial structure or fluctuations in the emission. These background fluctuations are generally interpreted as being a property of the extragalactic cosmic IR background. There is some debate as to whether the fluctuations represent emission from high-z sources or whether they can arise from very faint but much more local extragalactic sources. This program addresses a more fundamental issue, and will establish with certainty whether the fluctuation are truly extragalactic, or whether they might arise extremely locally in the zodiacal light, or interplanetary dust cloud. Presently zodiacal light is excluded by extrapolation of the fluctuations measured at longer wavelengths and larger spatial scales. However, it is possible to carry out a suitable observing program with IRAC that measures the IR background fluctuations as the zodiacal light changes over time (as a function of elongation). If the observed fluctuations correlate, even weakly, with the changing zodiacal light, then their interpretation as a property of the extragalactic CIB needs significant revision. There are no existing data sets that contain both sufficient depth for measurement of the fluctuations, and sufficient variation in the zodiacal light intensity to provide a strong test for correlations. The proposed observations will provide the data set that can directly measure whether any fraction of the observed fluctuations is caused by the local interplanetary dust rather than the extragalactic CIB.
Arendt Richard
Kashlinsky Alexander
Mather John
Moseley Harvey
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