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Clustering dependence on Lyman-$\alpha$ luminosity from MUSE surveys at $3<z<6$

Astrophysics of Galaxies 2023-03-01 v1

Abstract

[Abbreviated] We investigate the dependence of Lyman-α\alpha emitter (LAE) clustering on Lyman-α\alpha luminosity. We use 1030 LAEs from the MUSE-Wide survey, 679 LAEs from MUSE-Deep, and 367 LAEs from the to-date deepest ever spectroscopic survey, the MUSE Extremely Deep Field. All objects have spectroscopic redshifts of 3<z<63<z<6 and cover a large dynamic range of Lyα\alpha luminosities: 40.15<log(LLyα/[ergs1])<43.3540.15<\log (L_{\rm{Ly}\alpha}/[\rm{erg \:s}^{-1}])<43.35. We apply the Adelberger et al. K-estimator as the clustering statistic and fit the measurements with state-of-the-art halo occupation distribution (HOD) models. From the three main data sets, we find that the large-scale bias factor, the minimum mass to host one central LAE, MminM_{\rm{min}}, and (on average) one satellite LAE, M1M_1, increase weakly with an increasing line luminosity. The satellite fractions are 10\lesssim10% (20\lesssim20%) at 1σ1\sigma (3σ3\sigma) confidence level, supporting a scenario in which DMHs typically host one single LAE. We next bisected the three main samples into disjoint subsets to thoroughly explore the dependence of the clustering properties on LLyαL_{\rm{Ly}\alpha}. We report a strong (8σ8\sigma) clustering dependence on LLyαL_{\rm{Ly}\alpha}, where the highest luminosity LAE subsample (log(LLyα/[ergs1])42.53\log(L_{\rm{Ly}\alpha}/[\rm{erg \:s}^{-1}])\approx42.53) clusters more strongly (bhigh=3.130.15+0.08b_{\rm{high}}=3.13^{+0.08}_{-0.15}) and resides in more massive DMHs (log(Mh/[h1M])=11.430.10+0.04\log(M_{\rm{h}}/[h^{-1}\rm{M}_{\odot}])=11.43^{+0.04}_{-0.10}) than the lowest luminosity one (log(LLyα/[ergs1])40.97\log(L_{\rm{Ly}\alpha}/[\rm{erg \:s}^{-1}])\approx40.97), which presents a bias of blow=1.790.06+0.08b_{\rm{low}}=1.79^{+0.08}_{-0.06} and occupies log(Mh/[h1M])=10.000.09+0.12\log(M_{\rm{h}}/[h^{-1}\rm{M}_{\odot}])=10.00^{+0.12}_{-0.09} halos. We discuss the implications of these results for evolving Lyα\alpha luminosity functions, halo mass dependent Lyα\alpha escape fractions, and incomplete reionization signatures.

Keywords

Cite

@article{arxiv.2301.04133,
  title  = {Clustering dependence on Lyman-$\alpha$ luminosity from MUSE surveys at $3<z<6$},
  author = {Y. Herrero Alonso and T. Miyaji and L. Wisotzki and M. Krumpe and J. Matthee and J. Schaye and H. Aceves and H. Kusakabe and T. Urrutia},
  journal= {arXiv preprint arXiv:2301.04133},
  year   = {2023}
}

Comments

Accepted for publication in A&A. 17 pages, 14 figures, 4 tables