The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN

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dc.creatorOuchi, Masami
dc.creatorShimasaku, Kazuhiro
dc.creatorAkiyama, Masayuki
dc.creatorSimpson, Chris
dc.creatorSaito, Tomoki
dc.creatorUeda, Yoshihiro
dc.creatorFurusawa, Hisanori
dc.creatorSekiguchi, Kazuhiro
dc.creatorYamada, Toru
dc.creatorKodama, Tadayuki
dc.creatorKashikawa, Nobunari
dc.creatorOkamura, Sadanori
dc.creatorIye, Masanori
dc.creatorTakata, Tadafumi
dc.creatorYoshida, Michitoshi
dc.creatorYoshida, Makiko
dc.date2007-07-20
dc.date2008-06-02
dc.date.accessioned2026-07-07T09:41:45Z
dc.date.available2026-07-07T09:41:45Z
dc.descriptionWe present luminosity functions (LFs) and various properties of Lya emitters (LAEs) at z=3.1, 3.7, and 5.7, in a 1 deg^2 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 ~10^6 Mpc^3 with a limiting Lya luminosity of ~3x10^42 erg/s. We derive the LFs of Lya and UV-continuum (~1500 Å) 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.
dc.description75 pages, 27 figures; ApJS in press. High resolution version at http://www.ociw.edu/~ouchi/work/astroph/sxds_LAEs/ouchi_SXDSLAE_ApJS.pdf
dc.identifierhttps://arxiv.org/abs/0707.3161
dc.identifierhttp://arxiv.org/abs/0707.3161
dc.identifierdoi:10.1086/527673
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/161937
dc.subjectAstrophysics
dc.titleThe Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
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