The Cosmic Microwave Background

The Cosmic Microwave Background - The Cosmic Microwave...

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The Cosmic Microwave Background Detailed analysis of the microwave background radiation gives practically our only direct evidence of conditions before galaxy formation. The spectral shape and departures from perfect isotropies give (temporal and angular) evidence on the existence of structures at the epoch of recombination, which is the last view we currently have until galaxies and AGN begin to take shape at some epoch like z =10 (or whatever it is. ..). Two very useful references for much of the material in these final lectures are Peacock's Cosmological Physics (Cambridge 1999) and Galaxy Formation by Longair (Springer 1998). The existence of a recombination epoch happens because the densities of matter and radiation have different dependences on the cosmic scale factor (1/ R ³ versus 1/ R 4 ). The best-known maps of fluctuations in the background are from the COBE Differential Microwave Radiometer (DMR). These images illustrate the four-year data products as measured at 53 GHz, in galactic coordinates with the galactic center in the middle. At the top is the overall
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This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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The Cosmic Microwave Background - The Cosmic Microwave...

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