The Subaru/XMM‐NewtonDeep Survey (SXDS). IV. Evolution of Lyα Emitters from \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=3.1 \enddocument to 5.7 in the 1 deg2Field: Luminosity Functions and AGN

2007/07/31 by Masami Ouchi, Kazuhiro Shimasaku, Masayuki Akiyama +16 · 6 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1086/527673

75 pages, 27 figures; ApJS in press. High resolution version at http://www.ociw.edu/~ouchi/work/astroph/sxds_LAEs/ouchi_SXDSLAE_ApJS.pdf

openalex publication_date 2008/05/28 · arxiv created 2008/06/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We present luminosity functions (LFs) and various properties of Lya emitters (LAEs) at z=3.1, 3.7, and 5.7, in a 1 deg² sky of the Subaru/XMM-Newton Deep Survey (SXDS) Field. We obtain a photometric sample of 858 LAE candidates based on deep Subaru/Suprime-Cam imaging data, and a spectroscopic sample of 84 confirmed LAEs from Subaru/FOCAS and VLT/VIMOS spectroscopy in a survey volume of ~10⁶ Mpc³ with a limiting Lya luminosity of ~3x10⁴2 erg/s. We derive the LFs of Lya and UV-continuum (~1500 \AA) for each redshift, taking into account the statistical error and the field-to-field variation. We find that the apparent Lya LF shows no significant evolution between z=3.1 and 5.7 within factors of 1.8 and 2.7 in L* and phi*, respectively. On the other hand, the UV LF of LAEs increases from z=3.1 to 5.7, indicating that galaxies with Lya emission are more common at earlier epochs. We identify six LAEs with AGN activities from our spectra combined with VLA, Spitzer, and XMM-Newton data. Among the photometrically selected LAEs at z=3.1 and 3.7, only ~1 % show AGN activities, while the brightest LAEs with logL(Lya) >~ 43.4-43.6 erg/s appear to always host AGNs. Our LAEs are bluer in UV-continuum color than dropout galaxies, suggesting lower extinction and/or younger stellar populations. Our stacking analyses provide upper limits to the radio luminosity and the f(HeII)/f(Lya) line fraction, and constrain the hidden star formation (+low-luminosity AGN) and the primordial population in LAEs.

Citations

• Large Equivalent Width L[CLC]y[/CLC]α line Emission at [FORMULA][F]z=4.5[/F][/FORMULA]: Young Galaxies in a Young Universe?
• Colour corrections for high-redshift objects due to intergalactic attenuation
• Luminosity Functions of Lyα Emitters at Redshifts z = 6.5 and z = 5.7: Evidence against Reionization at z ≤ 6.5
• The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6
• SWIRE: The SIRTF Wide-area InfraRed Extragalactic Survey
• Radio Emission from Normal Galaxies
• Red and Reddened Quasars in the Sloan Digital Sky Survey
• The Hubble Ultra Deep Field
• Subaru Deep Survey. V. A Census of Lyman Break Galaxies atz ≃ 4 and 5 in the Subaru Deep Fields: Photometric Properties
• The Wide Field Imager Lyman-Alpha Search (WFILAS) for galaxies at redshift ~5.7

Cited by

• Searching for Pop III stars and galaxies at high redshift
• CONTINUUM EMISSION BY COOLING CLOUDS
• The clustering of Lyα emitters in a ΛCDM Universe
• BRIGHT STRONGLY LENSED GALAXIES AT REDSHIFTz∼ 6-7 BEHIND THE CLUSTERS ABELL 1703 AND CL0024+16
• The search for Population III stars
• INTENSITY MAPPING OF Lyα EMISSION DURING THE EPOCH OF REIONIZATION