RADIATIVE TRANSFER MODELING OF Ly{alpha} EMITTERS. II. NEW EFFECTS ON GALAXY CLUSTERING
- Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520 (United States)
- Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton, NJ 08544 (United States)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
- Institucio Catalana de Recerca i Estudis Avancats, Barcelona, Catalonia (Spain)
We study the clustering properties of z {approx} 5.7 Ly{alpha} emitters (LAEs) in a cosmological reionization simulation with a full Ly{alpha} radiative transfer calculation. Ly{alpha} radiative transfer substantially modifies the intrinsic Ly{alpha} emission properties, compared to observed ones, depending on the density and velocity structure environment around the Ly{alpha}-emitting galaxy. This environment-dependent Ly{alpha} selection introduces new features in LAE clustering, suppressing (enhancing) the line-of-sight (transverse) density fluctuations and giving rise to scale-dependent galaxy bias. In real space, the contours of the three-dimensional two-point correlation function of LAEs appear to be prominently elongated along the line of sight on large scales, an effect that is opposite to and much stronger than the linear redshift-space distortion effect. The projected two-point correlation function is greatly enhanced in amplitude by a factor of up to a few, compared to the case without the environment-dependent selection effect. The new features in LAE clustering can be understood with a simple, physically motivated model, where Ly{alpha} selection depends on matter density, velocity, and their gradients. We discuss the implications and consequences of the effects on galaxy clustering from Ly{alpha} selection in interpreting clustering measurements and in constraining cosmology and reionization from LAEs.
- OSTI ID:
- 21567716
- Journal Information:
- Astrophysical Journal, Vol. 726, Issue 1; Other Information: DOI: 10.1088/0004-637X/726/1/38; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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