CMB Maps at 0.5 Degree Resolution II: Unresolved Features

Details CMB Maps at 0.5 Degree Resolution II: Unresolved Features CMB Maps at 0.5 Degree Resolution II: Unresolved Features

1994-08-12

arxiv.org/abs/astro-ph/9408038v1

Astronomy and Astrophysics

Astrophysics

uuencoded compressed PostScript file (8 pages including 2 figures) submitted to The Astrophysical Journal Letters, August 12,

Scientific paper

High-contrast peaks in the cosmic microwave background (CMB) anisotropy can appear as unresolved sources to observers. We fit simulated CMB maps generated with a cold dark matter model to a set of unresolved features at instrumental resolution 0.5 degrees to 1.5 degrees and present the integral density per steradian n(>|T|) of unresolved features brighter than threshold temperature |T|. A typical medium-scale experiment observing 0.001 sr at 0.5 degree resolution would expect to observe one unresolved feature brighter than 85 \muK after convolution with the beam profile, with less than 5% probability to observe a source brighter than 150 \muK. Increasing the power-law index of primordial density perturbations n from 1 to 1.5 raises these temperature limits |T| by a factor of 2. The results are only weakly dependent on the assumed values of the Hubble constant and baryon density.

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