Ly alpha EMITTER GALAXIES AT z similar to 2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Ly alpha IMAGING

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dc.contributor.authorZheng, Zhen Ya
dc.contributor.authorMalhotra, Sangeeta
dc.contributor.authorRhoads, James E.
dc.contributor.authorFinkelstein, Steven L.
dc.contributor.authorWang, Jun Xian
dc.contributor.authorJiang, Chun Yan
dc.contributor.authorCai, Zheng
dc.date.accessioned2024-01-10T13:50:09Z
dc.date.available2024-01-10T13:50:09Z
dc.date.issued2016
dc.description.abstractWe present a narrowband survey with three adjacent filters for z - 2.8-2.9 Lyman alpha (Ly alpha) emitter (LAE) galaxies in the Extended Chandra Deep Field South (ECDFS), along with spectroscopic follow-up. With a complete sample of 96 LAE candidates in the narrowband NB466, we confirm the large-scale structure at z similar to 2.8 suggested by previous spectroscopic surveys. Compared to the blank field detected with the other two narrowband filters NB470 and NB475, the LAE-density excess in NB466 (900 arcmin(2)) is similar to 6.0 +/- 0.8 times the standard deviation expected at z similar to 2.8, assuming a linear bias of 2. The overdense large-scale structure in NB466 can be decomposed into four protoclusters, whose overdensities (each within an equivalent comoving volume 15(3) Mpc(3)) relative to the blank field (NB470+NB475) are in the range of 4.6-6.6. These four protoclusters are expected to evolve into a Coma-like cluster (M >= 10(15) M-circle dot) at z similar to 0. We also investigate the various properties of LAEs at z = 2.8-2.9 and their dependence on the environment. The average star formation rates derived from the Lya, rest-frame UV, and X-ray bands are similar to 4, 10, and < 16 M-circle dot yr(-1), respectively, implying a Ly alpha escape fraction of 25% less than or similar to f(ESC)(Ly alpha) less than or similar to 40% and a UV continuum escape fraction of f(ESC)(UV,cont) greater than or similar to 62% for LAEs at z similar to 2.8. The Ly alpha photon density calculated from the integrated Ly alpha luminosity function in the overdense field (NB466) is similar to 50% higher than that in the blank field (NB470+NB475), and more bright LAEs are found in the overdense field. The three brightest LAEs, including a quasar at z = 2.81, are all detected in the X-ray band and in NB466. These three LAE-active galactic nuclei contribute an extra 20%-30% Lya photon density compared to other LAE galaxies. Furthermore, we find that LAEs in overdense regions have larger equivalent width values, bluer U-B and V-R (similar to 2-3 sigma) colors compared with those in lower density regions, indicating that LAEs in overdense regions are younger and possible less dusty. We conclude that the structure at z similar to 2.8 in the ECDFS field is a very significant and rare density peak similar to the SSA22 protocluster, and narrowband imaging is an efficient method of detecting and studying such structures in the high-z universe.
dc.description.funderChinese Academy of Sciences (CAS) through a CAS-CONICYT Postdoctoral Fellowship
dc.description.funderNSFC
dc.description.funderShanghai Natural Science Foundation
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent23 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/0067-0049/226/2/23
dc.identifier.eissn1538-4365
dc.identifier.issn0067-0049
dc.identifier.urihttps://doi.org/10.3847/0067-0049/226/2/23
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79508
dc.identifier.wosidWOS:000386492400003
dc.information.autorucAstrofísica;Zheng ZY;S/I;243995
dc.issue.numero2
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: high-redshift
dc.subjectgalaxies: luminosity function
dc.subjectgalaxies: structure
dc.subjectmass function
dc.subjectLYMAN-BREAK GALAXIES
dc.subjectEMISSION-LINE GALAXIES
dc.subjectSTAR-FORMATION RATE
dc.subjectLUMINOSITY FUNCTIONS
dc.subjectRADIO GALAXY
dc.subjectEQUIVALENT WIDTH
dc.subjectSPIDERWEB GALAXY
dc.subjectESCAPE FRACTION
dc.subjectPROTO-CLUSTER
dc.subjectAGN ACTIVITY
dc.titleLy alpha EMITTER GALAXIES AT z similar to 2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Ly alpha IMAGING
dc.typeartículo
dc.volumen226
sipa.codpersvinculados243995
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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