Opened 4 years ago

Last modified 4 years ago

#262 new enhancement

review detailed level dependent H2 rates in this paper

Reported by: Gary J. Ferland Owned by: nobody
Priority: good to do Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:

Description (last modified by Gary J. Ferland)

Non-thermal photons and H$_2$ formation in the early Universe (article)
{Coppola}, C.~M. and {Galli}, D. and {Palla}, F. and {Longo}, S. and {Chluba}, J.
molecular processes, early Universe
The cosmological recombination of H and He at z ~= 103 and the formation 
of H2 during the dark ages produce a non-thermal photon excess in the Wien 
tail of the cosmic microwave background blackbody spectrum. Here, we 
compute the effect of these photons on the H- photodetachment and 
H_2^+ photodissociation processes. We discuss the implications for the 
chemical evolution of the Universe in the post-recombination epoch, 
emphasizing how important a detailed account of the full vibrational 
manifold of H2 and H_2^+ in the chemical network is. We find that the 
final abundances of H2, H_2^+, H_3^+ and HD are significantly smaller 
than in previous calculations that neglected the effect of non-thermal 
photons. The suppression is mainly caused by extra hydrogen 
recombination photons and could affect the formation rate of first stars. 
We provide simple analytical approximations for the relevant rate coefficients 
and briefly discuss the additional effect of dark matter annihilation on 
the considered reaction rates.

Provided by the SAO/NASA Astrophysics Data System

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comment:1 Changed 4 years ago by Gary J. Ferland

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