Formation Mechanisms of "Negative"-Intensity Spots in the Cosmic Microwave Background Radiation and Distant Objects

Details Formation Mechanisms of "Negative"-Intensity Spots in the Cosmic Microwave Background Radiation and Distant Objects Formation Mechanisms of "Negative"-Intensity Spots in the Cosmic Microwave Background Radiation and Distant Objects

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..207d&link_type=abstract

Astronomy Letters, vol. 27, p. 207-212 (2001)

Astronomy and Astrophysics

Astronomy

2

Theoretical And Observational Cosmology

Scientific paper

We consider the formation mechanisms of "negative"-intensity spots in the radio band for various astrophysical conditions. For wavelengths lambda < 1.5 mm, the regions of reduced temperature (relative to the cosmic microwave background radiation, CMBR) are shown to be produced only by high-redshift objects moving at peculiar velocities. The main processes are CMBR Thomson scattering and bremsstrahlung. We show that the effect deltaT/T can be 10^{-5} in magnitude. We derive simple analytic expressions, which allow the redshifts, electron densities, and linear sizes of these regions to be estimated from observed spectral and spatial parameters. Additional observational methods for refining these parameters are outlined.

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