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dc.contributor.authorIRSIC, V
dc.contributor.authorViel, M
dc.contributor.authorHaehnelt, MG
dc.contributor.authorBolton, JS
dc.contributor.authorCristiano, S
dc.contributor.authorBecker, GD
dc.contributor.authorD'Odorico, V
dc.contributor.authorCupani, G
dc.contributor.authorKim, T-S
dc.contributor.authorBerg, TAM
dc.contributor.authorLopez, S
dc.contributor.authorEllison, S
dc.contributor.authorChristensen, L
dc.contributor.authorKelly, DD
dc.contributor.authorWorseck, G
dc.date.accessioned2017-09-11T09:37:16Z
dc.date.accessioned2018-09-25T15:20:34Z
dc.date.available2017-09-11T09:37:16Z
dc.date.available2018-09-25T15:20:34Z
dc.date.issued2017-07-19
dc.identifier.issn2470-0010
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/280697
dc.description.abstractWe present new measurements of the free-streaming of warm dark matter (WDM) from Lyman-α flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100 sample observed with the X-shooter spectrograph (z=3–4.2) and the high-resolution, high-redshift sample used in Viel et al. (2013) obtained with the HIRES/MIKE spectrographs (z=4.2 – 5.4 ). Based on further improved modelling of the dependence of the Lyman- α flux-power spectrum on the free-streaming of dark matter, cosmological parameters, as well as the thermal history of the intergalactic medium (IGM) with hydrodynamical simulations, we obtain the following limits, expressed as the equivalent mass of thermal relic WDM particles. The XQ-100 flux power spectrum alone gives a lower limit of 1.4 keV, the re-analysis of the HIRES/MIKE sample gives 4.1 keV while the combined analysis gives our best and significantly strengthened lower limit of 5.3 keV (all 2 σ C.L.). The further improvement in the joint analysis is partly due to the fact that the two data sets have different degeneracies between astrophysical and cosmological parameters that are broken when the data sets are combined, and more importantly on chosen priors on the thermal evolution. These results all assume that the temperature evolution of the IGM can be modeled as a power law in redshift. Allowing for a nonsmooth evolution of the temperature of the IGM with sudden temperature changes of up to 5000 K reduces the lower limit for the combined analysis to 3.5 keV. A WDM with smaller thermal relic masses would require, however, a sudden temperature jump of 5000 K or more in the narrow redshift interval z = 4.6 – 4.8 , in disagreement with observations of the thermal history based on high-resolution resolution Lyman- α forest data and expectations for photo-heating and cooling in the low density IGM at these redshifts.
dc.description.sponsorshipV. I. is supported by U.S. NSF Grant No. AST-1514734. V. I. also thanks M. McQuinn for useful discussions, and IAS, Princeton, for hospitality during his stay where part of this work was completed. M. V. and T. S. K. are supported by ERC-StG “cosmoIGM”. S. L. has been supported by FONDECYT grant number 1140838 and partially by PFB-06 CATA. V. D., M. V., S. C. acknowledge support from the PRIN INAF 2012 “The X-Shooter sample of 100 quasar spectra at z ∼ 3.5 : Digging into cosmology and galaxy evolution with quasar absorption lines. G. B. is supported by the NSF under award AST-1615814. S. L. E. acknowledges the receipt of an NSERC Discovery Grant. M. H. acknowledges support by ERC ADVANCED GRANT 320596 “The Emergence of Structure during the epoch of Reionization”. L. C. is supported by YDUN DFF 4090-00079. K. D. D. is supported by an NSF AAPF fellowship awarded under NSF grant AST-1302093. J. S. B. acknowledges the support of a Royal Society University Research Fellowship. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 189.A-0424. This work made use of the DiRAC High Performance Computing System (HPCS) and the COSMOS shared memory service at the University of Cambridge. These are operated on behalf of the STFC DiRAC HPC facility. This equipment is funded by BIS National E-infrastructure capital grant ST/J005673/1 and STFC grants ST/H008586/1, ST/K00333X/1.
dc.publisherAmerican Physical Society
dc.relation.replaceshttps://www.repository.cam.ac.uk/handle/1810/267116
dc.relation.replaces1810/267116
dc.titleNew constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-α forest data
dc.typeArticle
prism.issueIdentifier2
prism.number023522
prism.publicationDate2017
prism.publicationNamePhysical Review D - Particles, Fields, Gravitation and Cosmology
prism.volume96
dc.identifier.doi10.17863/CAM.13134
dc.identifier.doi10.17863/CAM.28062
dcterms.dateAccepted2017-06-26
rioxxterms.versionofrecord10.1103/PhysRevD.96.023522
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2017-07-19
dc.contributor.orcidIrsic, Vid [0000-0002-5445-461X]
dc.contributor.orcidHaehnelt, Martin [0000-0001-8443-2393]
dc.identifier.eissn2470-0029
dc.publisher.urlhttp://dx.doi.org/10.1103/PhysRevD.96.023522
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEuropean Research Council (320596)
pubs.funder-project-idScience and Technology Facilities Council (ST/K004352/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/L000636/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/N000927/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/H008586/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/J005673/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/K00333X/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/P000673/1)
pubs.funder-project-idSTFC (ST/M007073/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/P002315/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/R002452/1)
cam.issuedOnline2017-07-19


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