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http://hdl.handle.net/2289/4154
Title: | Nonequilibrium carbon ionization states and the extragalactic far-UV background with He2 absorption |
Authors: | Vasiliev, Evgenii O. Sethi, S.K. Nath, Biman B. |
Keywords: | Cosmology: theory Diffuse radiation Intergalatic medium Quasars: general |
Issue Date: | Jan-2011 |
Publisher: | Springer |
Citation: | Astrophysics and Space Science, 2011, Vol.335, p211 |
Abstract: | Using nonequilibrium calculations of the ionic states and the recently calculated extragalactic ultraviolet background radiation with absorption by intergalactic HeII we determine the ratios of CIII to CIV expected at z ∼ 2–3, as functions of metallicity, gas density and temperature. We constrain the spectrum of the extragalactic ultraviolet background radiation by fitting the observed abundance ratios carbon ions at these redshifts with those expected from different models of the background radiation. Our analysis of the observed ratios shows that ‘delayed reionization’ models, which assume a large fraction of HeII at z ∼ 3, is not favored by data. Our results suggest that HeII reionization was inhomogeneous, consistent with the predictions from recent simulations. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/4154 |
ISSN: | 0004-640X 1572-946X (Online) |
Alternative Location: | http://adsabs.harvard.edu/doi/10.1007/s10509-010-0585-6 http://dx.doi.org/10.1007/s10509-010-0585-6 |
Copyright: | 2011 Springer. |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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APSP_2011_335_211.pdf Restricted Access | Restricted access | 293.35 kB | Adobe PDF | View/Open Request a copy |
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