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Title

Galaxy clustering dependence on the [O II] emission line luminosity in the local Universe

AuthorsFavole, G; Rodríguez-Torres, S.A; Comparat, J; Prada, Francisco ; Guo, H; Klypin, A; Montero-Dorta, A.D.
KeywordsCosmology: theory
Galaxies: haloes
Galaxies: statistics
Large-scale structure of Universe
Cosmology: observations
Galaxies: distances and redshifts
Issue Date2017
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 472(1): 550- 558 (2017)
AbstractWe study the galaxy clustering dependence on the [O II] emission line luminosity in the SDSS DR7 Main galaxy sample at mean redshift z ~ 0.1. We select volume-limited samples of galaxies with different [O II] luminosity thresholds and measure their projected, monopole and quadrupole two-point correlation functions. We model these observations using the 1 h-1 Gpc MultiDark-Planck cosmological simulation and generate light cones with the SUrvey GenerAtoR algorithm. To interpret our results, we adopt a modified (Sub)Halo Abundance Matching scheme, accounting for the stellar mass incompleteness of the emission line galaxies. The satellite fraction constitutes an extra parameter in this model and allows to optimize the clustering fit on both small and intermediate scales (i.e. rp ¿ 30 h-1 Mpc), with no need of any velocity bias correction. We find that, in the local Universe, the [O II] luminosity correlateswith all the clustering statistics explored and with the galaxy bias. This latter quantity correlates more strongly with the SDSS r-band magnitude than [O II] luminosity. In conclusion, we propose a straightforward method to produce reliable clustering models, entirely built on the simulation products, which provides robust predictions of the typical ELG host halo masses and satellite fraction values. The SDSS galaxy data, MultiDark mock catalogues and clustering results are made publicly available. © 2017 The Authors.
URIhttp://hdl.handle.net/10261/167582
Identifiersdoi: 10.1093/mnras/stx1980
issn: 0035-8711
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