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dc.contributor.authorSanderbeck, PU
dc.contributor.authorIršič, V
dc.contributor.authorMcQuinn, M
dc.contributor.authorMeiksin, A
dc.date.accessioned2019-12-12T00:30:28Z
dc.date.available2019-12-12T00:30:28Z
dc.date.issued2019-06
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/299708
dc.description.abstractSpatial fluctuations in ultraviolet backgrounds can subtly modulate the distribution of extragalactic sources, a potential signal and systematic for large-scale structure surveys. While this modulation has been shown to be significant for 3D Ly α forest surveys, its relevance for other large-scale structure probes has been hardly explored, despite being the only astrophysical process that likely can affect clustering measurements on the scales of ≥Mpc. We estimate that the background fluctuations, modulating the amount of H I, have a fractional effect of (0.03-0.3) × (k/[10−2 Mpc−1])−1 on the power spectrum of 21 cm intensity maps at z = 1-3. We find a smaller effect for H α and Ly α intensity mapping surveys of (0.001-0.1) × (k/[10−2 Mpc−1])−1 and even smaller effect for more traditional surveys that correlate the positions of individual H α or Ly α emitters. We also estimate the effect of backgrounds on low-redshift galaxy surveys in general based on a simple model in which background fluctuations modulate the rate halo gas cools, modulating star formation: We estimate a maximum fractional effect on the power of ∼0.01 (k/[10−2 Mpc−1])−1 at z = 1. We compare sizes of these imprints to cosmological parameter benchmarks for the next generation of redshift surveys: We find that ionizing backgrounds could result in a bias on the squeezed triangle non-Gaussianity parameter fNL that can be larger than unity for power spectrum measurements with a SPHEREx-like galaxy survey, and typical values of intensity bias. Marginalizing over a shape of the form k−1PL, where PL is the linear matter power spectrum, removes much of this bias at the cost of ≈40 per cent larger statistical errors.
dc.publisherOxford University Press
dc.rightsAll rights reserved
dc.titleEstimates for the impact of ultraviolet background fluctuations on galaxy clustering measurements
dc.typeArticle
prism.endingPage5072
prism.issueIdentifier4
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage5059
prism.volume485
dc.identifier.doi10.17863/CAM.46778
dcterms.dateAccepted2019-03-07
rioxxterms.versionofrecord10.1093/mnras/stz741
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2019-03-07
dc.identifier.eissn1365-2966
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/stz741
rioxxterms.typeJournal Article/Review
cam.issuedOnline2019-03-14


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