J/ApJ/845/172ivo://CDS.VizieR/J/ApJ/845/172doi:10.26093/cds/vizier.18450172CDSBadescu T.Yang Y.Bertoldi F.Zabludoff A.Karim A.Magnelli B.2018-09-25T12:03:56Z2018-05-25T09:19:36ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frintergalactic-mediumline-intensitiesBright Ly{alpha} blobs (LABs)-extended nebulae with sizes of ~100kpc and Ly{alpha} luminosities of ~10^44^erg/s -- often reside in overdensities of compact Ly{alpha} emitters (LAEs) that may be galaxy protoclusters. The number density, variance, and internal kinematics of LABs suggest that they themselves trace group-like halos. Here, we test this hierarchical picture, presenting deep, wide-field Ly{alpha} narrowband imaging of a 1{deg}x0.5{deg} region around a LAB pair at z=2.3 discovered previously by a blind survey. We find 183 Ly{alpha} emitters, including the original LAB pair and three new LABs with Ly{alpha} luminosities of (0.9-1.3)x10^43^erg/s and isophotal areas of 16-24arcsec^2^. Using the LAEs as tracers and a new kernel density estimation method, we discover a large-scale overdensity (Bootes J1430+3522) with a surface density contrast of {delta}_{Sigma}_=2.7, a volume density contrast of {delta}~10.4, and a projected diameter of ~20 comoving Mpc. Comparing with cosmological simulations, we conclude that this LAE overdensity will evolve into a present-day Coma-like cluster with log(M/M_{sun}_)~15.1+/-0.2. In this and three other wide-field LAE surveys re-analyzed here, the extents and peak amplitudes of the largest LAE overdensities are similar, not increasing with survey size, and implying that they were indeed the largest structures then and today evolve into rich clusters. Intriguingly, LABs favor the outskirts of the densest LAE concentrations, i.e., intermediate LAE overdensities of {delta}_{Sigma}_=1-2. We speculate that these LABs mark infalling protogroups being accreted by the more massive protocluster.2017ApJ...845..172Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/845/172CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)J/PASJ/57/165 : Ly{alpha} emitters in the SUBARU Deep Field (Taniguchi+, 2005)J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)J/ApJ/667/79 : Ly{alpha} emission-line galaxies at z=3.1 (Gronwall+, 2007)J/A+A/461/823 : Candidate Ly{alpha} emitting galaxies (Venemans+, 2007)J/ApJ/673/143 : HST photometry of TN J1338-1942 (Overzier+, 2008)J/MNRAS/400/L66 : Ly{alpha} emitters near B3 J2330+3927 (Matsuda+, 2009)J/A+A/498/13 : Lyman-{alpha} emitters from redshifts z~2-3 (Nilsson+, 2009)J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011)J/ApJ/744/110 : LAE galaxies between 2.1=<z<=3.1 (Ciardullo+, 2012)J/ApJ/759/133 : z=2.4 Ly{alpha} emitters in the 53W002 field (Mawatari+, 2012)J/ApJ/769/79 : Spitzer obs. of radio-loud AGNs (CARLA) (Wylezalek+, 2013)J/ApJ/796/64 : H{beta} & Ly{alpha} emitting galaxies at z~2 (Ciardullo+, 2014)J/A+A/570/A55 : Spiderweb galaxy 870um and 1.4GHz images (Dannerbauer+, 2014)J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)J/ApJ/823/11 : Candidate Ly{alpha} emitting galaxies at z~3.8 (Dey+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/845/172https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/845/172http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/845/172https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/845/172https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/845/172http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/845/172GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/845/172/table2 (Properties of Ly{alpha} blobs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/845/172/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/845/172/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/845/172/table2?GETtext/xml+votable180.050000true217.74583335.5566670.005555555555555556Cone search capability for table J/ApJ/845/172/table1 (Catalog of Ly{alpha} emitter candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/845/172/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/845/172/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/845/172/table1?GETtext/xml+votable180.050000true218.1120335.24105810.0055555555555555565/2629https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/845/172?format=asciidefaultJ/ApJ/845/172/table2Properties of Ly{alpha} blobsFrac[93.9/97.5]? Recovery fraction (2)%meta.notefloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject Name (1)meta.id;meta.maincharRAJ2000[14] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[35] Degree of Declination (J2000)pos.eq.dec;meta.mainLLya[0.9/2.7] Lyman {alpha} luminosity of the object; in 10^43^erg/s units1e+36Wphys.luminosity;em.UVfloate_LLya[0.08/0.2] Error for LLya1e+36Wstat.errorfloatSize[15.5/43] Sizearcsec**2phys.angSizefloate_Size[1.6/7] Uncertainty in Sizearcsec**2stat.error;phys.angSizefloatRef[1/2] Source (1)meta.bibintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/845/172/table1Catalog of Ly{alpha} emitter candidatesRAJ2000[216.8/218.3] Right Ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDEJ2000[35.2/35.9] Declination (J2000)degpos.eq.dec;meta.mainLLya[2.4e+41/2.3e+43] Lyman {alpha} luminosity of the object; in erg/s units1e-07Wphys.luminosity;em.UVdoublee_LLya[2.2e+41/7.9e+41] Error for LLya1e-07Wstat.errorfloatEWLya[68/145015] Equivalent width, Lyman {alpha} emission; in Angstrom units0.1nmspect.line.eqWidthint