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An Ultraluminous Lyman Alpha Emitter with a Blue Wing at z=6.6

, , , , , and . (2016)cite arxiv:1606.03526Comment: 6 pages, 4 figures, 1 table, accepted for publication in ApJ Letters.

Abstract

We report the detection of the most luminous high-redshift Lyman Alpha Emitting galaxy (LAE) yet seen, with log L(Ly alpha) = 43.9 ergs/s. The galaxy -- COSMOS Lyman alpha 1, or COLA1 -- was detected in a search for ultra-luminous LAEs with Hyper Suprime-Cam on the Subaru telescope. It was confirmed to lie at z = 6.593 based on a Lyman alpha line detection obtained from followup spectroscopy with the DEIMOS spectrograph on Keck2. COLA1 is the first very high-redshift LAE to show a multi-component Lyman alpha line profile with a blue wing, which suggests that it could lie in a highly ionized region of the intergalactic medium and could have significant infall. If this interpretation is correct, then ultra-luminous LAEs like COLA1 offer a unique opportunity to determine the properties of the HII regions around these galaxies which will help in understanding the ionization of the z ~ 7 intergalactic medium.

Description

[1606.03526] An Ultraluminous Lyman Alpha Emitter with a Blue Wing at z=6.6

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hu2016ultraluminous
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