Carbon in the pregalactic epoch and the search for the first haloes

Details Carbon in the pregalactic epoch and the search for the first haloes Carbon in the pregalactic epoch and the search for the first haloes

2007-03-21

arxiv.org/abs/astro-ph/0703547v3

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures. In V2 some references added. V3 figures adjusted

Scientific paper

A possible way of detecting the first structure formation in a non-standard BBN Universe during the dark age, due to the resonant scattering of the CMBR photons in the rotational lines of the primordial CH molecule is discussed. The calculations are made within the framework of the $\Lambda$CDM cosmology and plausible first structure physical conditions. The carbon chemistry during the pregalactic epoch is considered. The relative abundance of the CH molecule is found to be $10^{-14}$ whereas the adopted [C]/[H] ratio was taken to be $10^{-10}$. The optical depth, dT/T and integration times are estimated. The calculated optical depth turns out to have values that are rather high, that clearly argue in favor of this molecule as an excellent candidate in searches of first structure formation. Possible observations with the GMT and ALMA are discussed.

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