Spectral Spatial Fluctuations of CMBR: Strategy and Concept of the Experiment

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 $\Delta T/T$ are 2x10^{-5}--2x10^{-6}$forSSFcausedbyHeH$^+$atz=20-30whicharepossibleredshiftsofearlyreionizationscenario.Thebandwidthofthelinesis0.1-2$Δ$T/Tlimitintheexperimentis2x10$^{-5}$ with 6'-7' 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.

arXiv comment26 pages, 6 figures

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• The Chemistry of the Early Universe
• Distortion of the CMB spectrum by the first molecules of the Dark Ages