Simulated cosmic microwave background maps at 0.5 deg resolution: Unresolved features

Details Simulated cosmic microwave background maps at 0.5 deg resolution: Unresolved features Simulated cosmic microwave background maps at 0.5 deg resolution: Unresolved features

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l...5k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 1, p. L5-L7

Astronomy and Astrophysics

Astronomy

5

Angular Distribution, Astronomical Models, Background Radiation, Big Bang Cosmology, Cosmic Rays, Dark Matter, Microwaves, Power Spectra, Angular Resolution, Anisotropy, Computerized Simulation, Cosmic Background Explorer Satellite, Density Distribution, Hubble Constant, Pixels, Spaceborne Astronomy

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 deg-1.5 deg to derive the integral number density per steradian n (greater than absolute value of T) of features brighter than threshold temperature absolute value of T and compare the results to recent experiments. A typical medium-scale experiment observing 0.001 sr at 0.5 deg resolution would expect to observe one feature brighter than 85 micro-K after convolution with the beam profile, with less than 5% probability to observe a source brighter than 150 micro-K. Increasing the power-law index of primordial density perturbations n from 1 to 1.5 raises these temperature limits absolute value of T by a factor of 2. The MSAM features are in agreement with standard cold dark matter models and are not necessarily evidence for processes beyond the standard model.

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