Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543709d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #437.09; Bulletin of the American Astronomical Society, Vol. 42, p.391
Astronomy and Astrophysics
Astronomy
Scientific paper
The Recmbination Epoch in cosmology (redshift of 800-1300) could be a very useful probe of the early universe and given the potential of high S/N observations from PLANCK we will be able to extract much information if we have a consistent radiative transfer framework that can trace the recombination era as a function of time. One can study a variety of quantities such as subtle effects in the electron fraction, line profiles, etc.
We consider a patch of the early universe during the recombination epoch with a set of spatially separated baryonic mass points moving with a Hubble flow. The density of dark matter and dark energy is embedded in the Hubble constant at each epoch. We treat this as an 1D problem. This patch is treated as a snapshot of the universe at a certain instant of time identified by redshift z and then evolve the system in time over the recombination era. In order to do this correctly, the time for a photon to travel across the whole patch should be smaller than the time interval between two snapshots. We use our very successful atmosphere code PHOENIX with time dependent radiative transfer equation and rate equations for hydrogen, helium and lithium to solve for the radiation field intensity at each radially separated point at each instant of time. All elements are considered to be in NLTE and have multi-level atomic structure. We solve the transfer equation using the short-characteristic approach where the specific intensity at two intersecting points between a characteristic ray and a radial layer represent two different directions of photon propagation at a given point but at two different instants of time. Compton scattering is being implemented in our calculation, it is an important process in the recombination epoch and couples the matter and radiation temperatures.
Baron Eddie
De Soma
Hauschildt Paul
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