Astrophys. J., 859, 84-84 (2018/June-1)
SILVERRUSH. V. Census of Lyα, [O III] λ5007, Hα, and [C II] 158 µm line emission with ∼1000 LAEs at z = 4.9-7.0 revealed with Subaru/HSC.
HARIKANE Y., OUCHI M., SHIBUYA T., KOJIMA T., ZHANG H., ITOH R., ONO Y., HIGUCHI R., INOUE A.K., CHEVALLARD J., CAPAK P.L., NAGAO T., ONODERA M., FAISST A.L., MARTIN C.L., RAUCH M., BRUZUAL G.A., CHARLOT S., DAVIDZON I., FUJIMOTO S., HILMI M., ILBERT O., LEE C.-H., MATSUOKA Y., SILVERMAN J.D. and TOFT S.
Abstract (from CDS):
We investigate Lyα, [O III] λ5007, Hα, and [C II] 158 µm emission from 1124 galaxies at z = 4.9-7.0. Our sample is composed of 1092 Lyα emitters (LAEs) at z = 4.9, 5.7, 6.6, and 7.0 identified by Subaru/Hyper-Suprime-Cam (HSC) narrowband surveys covered by Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH) and 34 galaxies at z = 5.148-7.508 with deep ALMA [C II] 158 µm data in the literature. Fluxes of strong rest-frame optical lines of [O III] and Hα (Hβ) are constrained by significant excesses found in the SPLASH 3.6 and 4.5 µm photometry. At z = 4.9, we find that the rest-frame Hα equivalent width and the Lyα escape fraction fLyα positively correlate with the rest-frame Lyα equivalent width EWLyα0. The fLyα–EWLyα0 correlation is similarly found at z ∼ 0-2, suggesting no evolution of the correlation over z ≃ 0-5. The typical ionizing photon production efficiency of LAEs is log(ξion/[Hz erg–1]) ≃ 25.5, significantly (60%-100%) higher than those of LBGs at a given UV magnitude. At z = 5.7-7.0, there exists an interesting turnover trend that the [O III]/Hα flux ratio increases in EWLyα0≃0–30Åand then decreases out to EWLyα0≃130Å. We also identify an anticorrelation between a ratio of [C II] luminosity to star formation rate (L_[C II]_/SFR) and EWLyα0 at the >99% confidence level.. We carefully investigate physical origins of the correlations with stellar-synthesis and photoionization models and find that a simple anticorrelation between EWLyα0 and metallicity explains self-consistently all of the correlations of Lyα, Hα, [O III]/Hα, and [C II] identified in our study, indicating detections of metal-poor (∼0.03 Z☉) galaxies with EWLyα0≃200Å.
© 2018. The American Astronomical Society. All rights reserved.
galaxies: evolution - galaxies: formation - galaxies: high-redshift
Status at CDS
All or part of tables of objects will be ingested in SIMBAD with priority 1.
View the references in ADS
To bookmark this query, right click on this link: simbad:2018ApJ...859...84H and select 'bookmark this link' or equivalent in the popup menu