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The photoheating of the intergalactic medium in synthesis models of the UV background

Puchwein, Ewald; Bolton, James S.; Haehnelt, Martin G.; Madau, Piero; Becker, George D.; Haardt, Francesco

Authors

Ewald Puchwein

Martin G. Haehnelt

Piero Madau

George D. Becker

Francesco Haardt



Abstract

We compare cosmological hydrodynamical simulations combined with the homogeneous metagalactic UV background (UVB) of Haardt & Madau (2012) (HM2012) to observations of the Lyman-alpha forest that are sensitive to the thermal and ionization state of the intergalactic medium (IGM). The transition from optically thick to thin photoheating predicted by the simple one-zone, radiative transfer model implemented by HM2012 predicts a thermal history that is in remarkably good agreement with the observed rise of the IGM temperature at z~3 if we account for the expected evolution of the volume filling factor of HeIII. Our simulations indicate that there may be, however, some tension between the observed peak in the temperature evolution and the rather slow evolution of the HeII opacities suggested by recent Hubble Space Telescope/COS measurements. The HM2012 UVB also underpredicts the metagalactic hydrogen photoionization rate required by our simulations to match the observed opacity of the forest at z>4 and z

Journal Article Type Article
Publication Date Jul 11, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 450
Issue 4
Pages 4081-4097
APA6 Citation Puchwein, E., Bolton, J. S., Haehnelt, M. G., Madau, P., Becker, G. D., & Haardt, F. (2015). The photoheating of the intergalactic medium in synthesis models of the UV background. Monthly Notices of the Royal Astronomical Society, 450(4), 4081-4097. https://doi.org/10.1093/mnras/stv773
DOI https://doi.org/10.1093/mnras/stv773
Keywords Radiative Transfer, Methods: Numerical, Intergalactic Medium, Quasars, Absorption Lines, Cosmology: Theory
Publisher URL http://mnras.oxfordjournals.org/content/450/4/4081
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article has been published in Monthly Notices of the Royal Astronomical Society ©2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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