Lyα Emitters at z = 5.7 in the Subaru Deep Field

2006/02/28 by Kazuhiro Shimasaku, K. Shimasaku, N. Kashikawa +30 · 15 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble Deep Field #Luminosity #Luminosity function #Physics #Redshift #astro-ph

paper · pdf · doi:10.1093/pasj/58.2.313

23 pages, 20 figs, accepted for PASJ, a high resolution version of Figs.7,8 is available at http://hikari.astron.s.u-tokyo.ac.jp/~shima/z57LAE/

arxiv created 2006/02/28 · openalex publication_date 2006/04/25 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Abstract We present the properties of Lyα emitters (LAEs) at z=5.7 in the Subaru Deep Field. A photometric sample of 89 LAE candidates was constructed from narrow-band data down to NB816 = 26.0 (AB) in a continuous 725 arcmin² area. Spectra of 39 objects satisfying the photometric selection criteria for LAEs were obtained with Subaru and Keck II Telescopes, among which 28 were confirmed LAEs, one was a nearby galaxy, and eight were unclassified. We also obtained spectra of another 24 NB816-excess objects in the field, identifying six additional LAEs. We find that the Lyα luminosity function derived from the photometric sample is reproduced well by a Schechter function with L^⋆ = 7.9^+3.0_-2.2 × 10⁴² erg s^-1 and φ^⋆ = 6.3^+3.0_-2.0 × 10^-4 Mpc^-3 for α =-1.5 (fixed) over the whole luminosity range of L ≃ 3 × 10⁴² \hbox-- 3 × 10⁴³ erg s^-1. We then measured the rest-frame Lyα equivalent widths for the confirmed LAEs, to find that the median among the 28 objects satisfying the photometric selection criteria is W₀ⁱ = 233 Å. We infer that 30%-40% of LAEs at z=5.7 exceed W₀ⁱ = 240 Å. These large-EW objects probably cannot be accounted for by ordinary star-forming populations with a Salpeter IMF. We also find that LAEs with fainter far-UV luminosities have larger EWs. Finally, we derived the far-UV luminosity function of LAEs down to M_UV ≃-19.6 using the photometric sample, and compared it with that of Lyman-break galaxies (LBGs). We find that as high as about 80% of LBGs at z ∼ 6 have W₀ⁱ ≥ 100 Å, in sharp contrast to lower-z counterparts.

Citations

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• The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6
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• A Lyman αemitter atz= 6.5 found with slitless spectroscopy
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• Color-selected Galaxies at z 6 in the Great Observatories Origins Deep Survey
• Rest‐Frame Ultraviolet Spectra of \documentclassaastex \usepackageamsbsy \usepackageamsfonts \usepackageamssymb \usepackagebm \usepackagemathrsfs \usepackagepifont \usepackagestmaryrd \usepackagetextcomp \usepackageportland,xspace \usepackageamsmath,amsxtra \usepackage[OT2,OT1]fontenc \newcommand\cyr \renewcommand\rmdefaultwncyr \renewcommand\sfdefaultwncyss \renewcommand\encodingdefaultOT2 \normalfont \selectfont \DeclareTextFontCommand\textcyr\cyr \pagestyleempty \DeclareMathSizes10976 \begindocument \landscape z∼ 3 \enddocument Lyman Break Galaxies

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