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Understanding the non-linear clustering of high-redshift galaxies

Jose, C.; Baugh, C.M.; Lacey, C.G.; Subramanian, K.

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Authors

C. Jose

K. Subramanian



Abstract

We incorporate the non-linear clustering of dark matter haloes, as modelled by Jose et al. into the halo model to better understand the clustering of Lyman break galaxies (LBGs) in the redshift range z = 3–5. We find that, with this change, the predicted LBG clustering increases significantly on quasi-linear scales (0.1 ≤ r / h−1 Mpc ≤ 10) compared to that in the linear halo bias model. This, in turn, results in an increase in the clustering of LBGs by an order of magnitude on angular scales 5 ≤ θ ≤ 100 arcsec. Remarkably, the predictions of our new model on the whole remove the systematic discrepancy between the linear halo bias predictions and the observations. The correlation length and large-scale galaxy bias of LBGs are found to be significantly higher in the non-linear halo bias model than in the linear halo bias model. The resulting two-point correlation function retains an approximate power-law form in contrast with that computed using the linear halo bias theory. We also find that the non-linear clustering of LBGs increases with increasing luminosity and redshift. Our work emphasizes the importance of using non-linear halo bias in order to model the clustering of high-z galaxies to probe the physics of galaxy formation and extract cosmological parameters reliably.

Citation

Jose, C., Baugh, C., Lacey, C., & Subramanian, K. (2017). Understanding the non-linear clustering of high-redshift galaxies. Monthly Notices of the Royal Astronomical Society, 469(4), 4428-4436. https://doi.org/10.1093/mnras/stx1014

Journal Article Type Article
Acceptance Date Apr 25, 2017
Online Publication Date Apr 27, 2017
Publication Date Apr 27, 2017
Deposit Date Jul 18, 2017
Publicly Available Date Jul 18, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 469
Issue 4
Pages 4428-4436
DOI https://doi.org/10.1093/mnras/stx1014

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors.
Published by Oxford University Press on behalf of the Royal Astronomical Society.





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