J/ApJ/823/11ivo://CDS.VizieR/J/ApJ/823/11doi:10.26093/cds/vizier.18230011CDSDey A.Lee K.-S.Reddy N.Cooper M.Inami H.Hong S.Gonzalez A.H.,Jannuzi B.T.2018-09-13T07:05:11Z2016-09-21T06:09:15ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyinfrared-photometryvisible-astronomybroad-band-photometryredshiftedline-intensitiesWe present new observations of the field containing the z=3.786 protocluster PC 217.96+32.3. We confirm that it is one of the largest known and most overdense high-redshift structures. Such structures are rare even in the largest cosmological simulations. We used the Mayall/MOSAIC1.1 imaging camera to image a 1.2x0.6{deg} area (~150x75 comoving Mpc) surrounding the protocluster's core and discovered 165 candidate Ly{alpha} emitting galaxies (LAEs) and 788 candidate Lyman Break galaxies (LBGs). There are at least two overdense regions traced by the LAEs, the largest of which shows an areal overdensity in its core (i.e., within a radius of 2.5 comoving Mpc) of 14+/-7 relative to the average LAE spatial density (\bar{rho}) in the imaged field. Further, \bar{rho} is twice that derived by other field LAE surveys. Spectroscopy with Keck/DEIMOS yielded redshifts for 164 galaxies (79 LAEs and 85 LBGs); 65 lie at a redshift of 3.785+/-0.010. The velocity dispersion of galaxies near the core is {sigma}=350+/-40km/s, a value robust to selection effects. The overdensities are likely to collapse into systems with present-day masses of >10^15^M_{sun}_ and >6x10^14^M_{sun}_. The low velocity dispersion may suggest a dynamically young protocluster. We find a weak trend between narrow-band (Ly{alpha}) luminosity and environmental density: the Ly{alpha} luminosity is enhanced on average by 1.35x within the protocluster core. There is no evidence that the Ly{alpha} equivalent width depends on environment. These suggest that star formation and/or active galactic nucleus (AGN) activity is enhanced in the higher-density regions of the structure. PC 217.96+32.3 is a Coma cluster analog, witnessed in the process of formation.2016ApJ...823...11Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/823/11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/572/A41 : VUDS Dicovery of a high-redshift protocluster (Lemaux+, 2014)J/ApJ/779/137 : HST NIR spectrosc. of ISCS z>1 gal. clusters (Zeimann+, 2013)J/ApJ/743/9 : z=3.1 LAEs morphological properties (Gronwall+, 2011)J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011)J/ApJ/684/905 : z>1 gal. clusters from IRAC Shallow Survey (Eisenhardt+, 2008)J/ApJS/176/301 : Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008)J/ApJ/673/143 : HST photometry of TN J1338-1942 (Overzier+, 2008)J/A+A/461/823 : Candidate Ly{alpha} emitting galaxies (Venemans+, 2007)J/A+A/431/793 : Ly-alpha emitters around MRC 0316-257 (Venemans+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/823/11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/823/11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/823/11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/823/11https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/823/11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/823/11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/823/11/table3 (Photometry of LAE candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/823/11/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/823/11/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/823/11/table3?GETtext/xml+votable180.050000true217.6544332.893430.005555555555555556Cone search capability for table J/ApJ/823/11/table4 (Keck/DEIMOS redshifts and luminosities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/823/11/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/823/11/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/823/11/table4?GETtext/xml+votable180.050000true217.9363332.529390.0055555555555555566/9144 9145 9146https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/823/11?format=asciiInfraredOpticaldefaultJ/ApJ/823/11/table3Photometry of LAE candidatesNameLyman Alpha Emitting (LAE) galaxy namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpDisplay the spectroscopic data for this LAE sourcemeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainWRC4mag[21.8/25] WRC4/KPNO MOSAIC1.1 (5819{AA}) narrow-band AB magnitude (1)magphot.mag;em.optfloate_WRC4mag[0.04/0.3] Uncertainty in WRC4magmagstat.error;phot.magfloatl_WRC4-RLimit flag on WRC4-R colormeta.code.errorcharWRC4-R[-4.1/-0.6] WRC4-R color index; R/KPNO NDWFS mag (2)magphot.color;em.opt;em.optfloate_WRC4-R[0.05/1]? Uncertainty in WRC4-R colormagstat.errorfloatnullablel_BW-RLimit flag on BW-R colormeta.code.errorcharBW-R[0.1/4.4] BW-R color index; B_W/KPNO NDWFS mag (2)magphot.color;em.opt.B;em.opt.Rfloate_BW-R[0.09/1]? Uncertainty in BW-R colormagstat.errorfloatnullablel_R-ILimit flag on R-I colormeta.code.error;phot.color;em.opt.RcharR-I[-1.3/1.9]? R-I color index; I/KPNO NDWFS mag (2)magphot.color;em.opt.R;em.opt.Ifloatnullablee_R-I[0.05/12]? Uncertainty in R-I colormagstat.error;phot.color;em.opt.RfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/823/11/table4Keck/DEIMOS redshifts and luminositiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameLyman Alpha Emitting (LAE) galaxy namemeta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[3.76/3.81] Spectroscopic Redshift (1)src.redshiftfloatl_W0(Lya)Limit flag on W0(Lya)meta.code.errorcharW0(Lya)[19/1068] Rest-frame equivalent width of Lyman Alpha, Angstroms (2)0.1nmspect.line.eqWidthfloate_W0(Lya)[0.6/110]? Uncertainty in W0(Lya) (2)0.1nmstat.errorfloatnullableF(Lya)[1.1/16.7] Lyman Alpha Flux, 10-17erg/s/cm21e-20W.m**-2phot.fluxfloate_F(Lya)[0.1/4] Uncertainty in F(Lya)1e-20W.m**-2stat.errorfloatL(Lya)[1.6/24.2] Lyman Alpha Luminosity, 10+42erg/s1e+35Wphys.luminosity;em.UVfloate_L(Lya)[0.2/6] Uncertainty in L(Lya)1e+35Wstat.errorfloatL(1700)[0.1/7.7] Continuum Luminosity at 1700{AA}, 10+29erg/s/Hz1e+22W.Hz**-1phys.luminosity;spect.continuumfloate_L(1700)[0.09/16] Uncertainty in L(1700)1e+22W.Hz**-1stat.errorfloat