IRAS Explanatory Supplement
VII. Analysis of Processing
D. Photometric Accuracy
D.4 Discrepant Fluxes
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The distribution of sources with discrepant fluxes at 12 and 25 µm
greatly resembles the distribution of variable stars, suggesting that time
variability is the dominant cause of such discrepant fluxes. At 60 and 100
µm, the distribution is much different, since the sources cluster in
two patches in the Galactic plane for reasons that are, at this time,
unknown. Only about 1,000 sources have discrepant fluxes at 60 and 100
µm. It is worth noting that the sources with discrepant fluxes are not
predominantly found close to the ecliptic plane so that asteroids are not a
significant cause of this problem (Section VII.F).
Roughly 50,000 sources are tagged with discrepant upper limits. These sources
are mainly near the Galactic plane wherethe erratic behavior of the noise
estimator causes this variation.
Chapter Contents |
Introduction |
Authors |
References
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Index |
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