Elisa Boera
The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement
Boera, Elisa; Murphy, Michael T.; Becker, George D.; Bolton, James S.
Authors
Michael T. Murphy
George D. Becker
James S. Bolton
Abstract
According to the photoheating model of the intergalactic medium (IGM), He ii reionization is expected to affect its thermal evolution. Evidence for additional energy injection into the IGM has been found at 3 ≲ z ≲ 4, though the evidence for the subsequent fall-off below z ∼ 2.8 is weaker and depends on the slope of the temperature–density relation, γ. Here we present, for the first time, an extension of the IGM temperature measurements down to the atmospheric cut-off of the H i Lyman-α (Lyα) forest at z ≃ 1.5. Applying the curvature method on a sample of 60 Ultraviolet and Visual Echelle Spectrograph (UVES) spectra we investigated the thermal history of the IGM at z < 3 with precision comparable to the higher redshift results. We find that the temperature of the cosmic gas traced by the Lyα forest [T(Δ¯)] increases for increasing overdensity from T(Δ¯)∼22670 to 33740 K in the redshift range z ∼ 2.8–1.6. Under the assumption of two reasonable values for γ, the temperature at the mean density (T0) shows a tendency to flatten at z ≲ 2.8. In the case of γ ∼ 1.5, our results are consistent with previous ones which indicate a falling T0 for redshifts z ≲ 2.8. Finally, our T(Δ¯) values show reasonable agreement with moderate blazar heating models.
Citation
Boera, E., Murphy, M. T., Becker, G. D., & Bolton, J. S. (2014). The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement. Monthly Notices of the Royal Astronomical Society, 441(3), https://doi.org/10.1093/mnras/stu660
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 30, 2014 |
Publication Date | May 16, 2014 |
Deposit Date | May 4, 2017 |
Publicly Available Date | May 4, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 441 |
Issue | 3 |
DOI | https://doi.org/10.1093/mnras/stu660 |
Keywords | intergalactic medium, quasars: absorption lines, cosmology: observations |
Public URL | https://nottingham-repository.worktribe.com/output/728506 |
Publisher URL | https://academic.oup.com/mnras/article/441/3/1916/1111705/The-thermal-history-of-the-intergalactic-medium |
Contract Date | May 4, 2017 |
Files
stu660.pdf
(3 Mb)
PDF
Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
You might also like
Deep learning the intergalactic medium using lyman-alpha forest at 4 ≤ z ≤ 5
(2024)
Journal Article
Downloadable Citations
About Repository@Nottingham
Administrator e-mail: discovery-access-systems@nottingham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search