Lyman$\alpha$ Emitters beyond Redshift 5:The Dawn of Galaxy Formation

Abstract

The 8m class telescopes in the ground-based optical astronomy together with help from the ultra-sharp eye of the Hubble Space Telescope have enabled us to observe forming galaxies beyond redshift $z=5$. In particular, more than twenty Ly$\alpha$-emitting galaxies have already been found at $z>5$. These findings provide us with useful hints to investigate how galaxies formed and then evolved in the early universe. Further, detailed analysis of Ly$\alpha$ emission line profiles are useful in exploring the nature of the intergalactic medium because the trailing edge of cosmic reionization could be close to $z\sim 6$ -- 7, at which forming galaxies have been found recently. We also discuss the importance of superwinds from forming galaxies at high redshift, which has an intimate relationship between galaxies and the intergalactic medium. We then give a review of early cosmic star formation history based on recent progress in searching for Ly$\alpha$-emitting young galaxies beyond redshift 5.

23 pages, 12 figures, jkas35.sty. To appear in the proceedings of the APCTP WoFormation and Interaction of Galaxies, edited by Hyung Mok Leerkshop on

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Cited by in corpus (17)

• Old Galaxies in the Young Universe
• The Subaru Deep Field Project: Lyman$\alpha$ Emitters at Redshift of 6.6
• HST imaging and Keck Spectroscopy of z~6 I-band Drop-Out Galaxies in the ACS GOODS Fields
• The Abundance of Low-luminosity Lyman alpha Emitters at High Redshift
• Lyman Alpha Radiation From Collapsing Protogalaxies II: Observational Evidence for Gas Infall
• Three Lyman-alpha Emitters at z approx 6: Early GMOS/Gemini Data from the GLARE Project
• The evolution of galaxies from primeval irregulars to present-day ellipticals
• The MUSE-Wide Survey: A determination of the Lyman $\alpha$ emitter luminosity function at $3<z<6$
• Spectroscopy of z~6 i-dropout Galaxies: Frequency of Ly-alpha Emission and the Sizes of Ly-alpha Emitting Galaxies
• Photometric properties of Ly alpha emitters at z=4.86 in the COSMOS 2 square degree field
• A Dual Narrowband Survey for Hα Emitters at z=2.2: Demonstration of the Technique and Constraints on the Hα Luminosity Function
• A Lyman alpha emitter at z = 6.5 found with slitless spectroscopy
• A Subaru Search for Lyman-Alpha Emitters at z=5.8 with an Intermediate-Band Filter
• An Intermediate-band imaging survey for high-redshift Lyman Alpha Emitters: The Mahoroba-11
• Lyman Alpha Line Spectra of the First Galaxies: Dependence on Observed Direction to the Underlying CDM Filament
• New High-Redshift Galaxies at $z$ = 5.8 - 6.5 in the Subaru Deep Field
• A gradient boosting and broadband approach to finding Lyman-α emitting galaxies beyond narrowband surveys