Spectroscopy ofz∼ 6i‐Dropout Galaxies: Frequency of Lyα Emission and the Sizes of Lyα‐emitting Galaxies | Zendy

Corey DowHygelund | Zendy; B. Holden | Zendy; R. J. Bouwens | Zendy; G. D. Illingworth | Zendy; Arjen van der Wel | Zendy; Marijn Franx | Zendy; Pieter van Dokkum | Zendy; H. C. Ford | Zendy; P. Rosati | Zendy; D. Magee | Zendy; A. Zirm | Zendy

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Spectroscopy ofz∼ 6i‐Dropout Galaxies: Frequency of Lyα Emission and the Sizes of Lyα‐emitting Galaxies

Author(s) -

Corey DowHygelund,

B. Holden,

R. J. Bouwens,

G. D. Illingworth,

Arjen van der Wel,

Marijn Franx,

Pieter van Dokkum,

H. C. Ford,

P. Rosati,

D. Magee,

A. Zirm

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/512025

Subject(s) - astrophysics , physics , redshift , galaxy , population , spectroscopy , dropout (neural networks) , emission spectrum , equivalent width , spectral line , astronomy , medicine , environmental health , machine learning , computer science

We report on deep spectroscopy using LRIS on Keck I and FORS2 on the VLT of asample of 22 candidate z~6 Lyman Break galaxies (LBGs) selected by the i-z> 1.3dropout criterion. Redshifts could be measured for eight objects. Theseredshifts are all in the range z = 5.5 - 6.1, confirming the efficiency of thei-z color selection technique. Six of the confirmed galaxies show Ly-alphaemission. Assuming that the 14 objects without redshifts are z~6 LBGs, but lackdetectable Ly-alpha emission lines, we infer that the fraction of Ly-alphaemitting LBGs with Ly-alpha equivalent widths greater than 20 Angstroms amongz~6 LBGs is ~30%, similar to that found at z~3. Every Ly-alpha emitting objectin our sample is compact with r <= 0.14". Furthermore, all the Ly-alphaemitting objects in our sample are more compact than average relative to theobserved size-magnitude relation of a large i-dropout sample (332 candidate z~6objects). We can reject the hypothesis that the Ly-alpha emitting population isa subset of the rest of the z~6 LBG population at >97% confidence. We speculatethe small sizes of Ly-alpha emitting LBGs are due to these objects being lessmassive than other LBGs at z~6.Comment: 24 pages in emulate ApJ, 17 color figures (some resized to fit submission limits), and 3 tables. Accepted for publication in the Astrophysical Journa

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