Photometric properties of Lyα emitters at z ≈ 4.86 in the COSMOS 2 square degree field

摘要: We present results of a survey for Lyα emitters at z ≈ 4.86 based on optical narrowband (λ_c = 7126 A, Δλ 73 A) and broadband (B, V, r', i', z') observations the Cosmic Evolution Survey field using Suprime-Cam Subaru Telescope. find 79 emitter (LAE) candidates over contiguous area 1.83 deg^2, down to line flux 1.47 × 10^(–17) erg s^(-1) cm^(–2). obtain luminosity function with best-fit Schechter parameters log L* 42.9^(+0.5)_(–0.3) Ф* 1.2^(+8.0)_(–1.1) 10^(–4) Mpc^(-3) α –1.5 (fixed). The two-point correlation our LAE sample is ξ(r) (r/4.4^(+5.7)_(–2.9) Mpc)^(–1.90±0.22). In order investigate field-to-field variations properties emitters, we divide into nine tiles 0°.5 each. that number density varies factor ≃ 2 from high statistical significance. However, no significant variance when four 0°.7 conclude least 0.5 deg^2 required derive averaged LAEs ~ 5, wide enough overcome cosmic variance.