Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1779702 | New Astronomy | 2008 | 13 Pages |
Abstract
Spectral spatial fluctuations (SSF) of the cosmic microwave background radiation (CMBR) temperature are considered as a result of an interaction of primordial atoms and molecules with CMBR in proto-objects moving with peculiar velocities relative to the CMBR. Expected optimistic values of ÎT/T are 2 Ã 10â5-2 Ã 10â6 for SSF caused by HeH+ at z = 20-30 which are possible redshifts of early reionization scenario. The bandwidth of the lines is 0.1-2% depending on the scale of proto-objects and redshifts. For the SSF search CMBR maps in different spectral channels are to be observed and then processed by the Difference method. Simulation of the experiment is made for MSRT (Tuorla Observatory, Finland) equipped with a 7 Ã 4 beam cryo-microbolometer array with a chopping flat and frequency multiplexer providing up to seven spectral channels in each beam (88-100 GHz). Expected ÎT/T limit in the experiment is 2 Ã 10â5 with 6â²-7â² angular and 2% frequency resolution. Simulation shows that SSF may be recognized in the angular power spectrum when S/N in single frequency CMBR maps is as small as 1.17 or even something less for white noise. Such an experiment gives us a possibility to set upper limit of SSF in MM band and prepare future SSF observations.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Viktor Dubrovich, Anisa Bajkova, V.B. Khaikin,