J/A+A/620/A202ivo://CDS.VizieR/J/A+A/620/A202doi:10.26093/cds/vizier.36200202CDSArrigoni Battaia F.Chen C.-C.Fumagalli M.Cai Z.Calistro Rivera G.,Xu J.Smail I.Prochaska J.X.Yang Y.De Breuck C.2020-01-17T11:00:14Z2018-12-19T08:06:18ZCDS support team

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

cds-question@unistra.frnebulaegalaxy-clustersmillimeter-astronomyphotometrysubmillimeter-astronomyIn the hierarchical model of structure formation, giant elliptical galaxies form through merging processes within the highest density peaks known as protoclusters. While high-redshift radio galaxies usually pinpoint the location of these environments, we have recently discovered at z~2-3 three enormous (>200kpc) Lyman-alpha nebulae (ELANe) that host multiple active galactic nuclei (AGN) and that are surrounded by overdensities of Lyman- emitters (LAE). These regions are prime candidates for massive protoclusters in the early stages of assembly. To characterize the star-forming activity within these rare structures - both on ELAN and protocluster scales - we have initiated an observational campaign with the James Clerk Maxwell Telescope (JCMT) and the Atacama Pathfinder EXperiment (APEX) telescopes. In this paper we report on sensitive SCUBA-2/JCMT 850 and 450um observations of a 128 arcmin^2^ field comprising the ELAN MAMMOTH-1, together with the peak of the hosting BOSS1441 LAE overdensity at z=2.32. These observations unveil 4.0+/-1.3 times higher source counts at 850um with respect to blank fields, likely confirming the presence of an overdensity also in obscured tracers. We find a strong detection at 850um associated with the continuum source embedded within the ELAN MAMMOTH-1, which - together with the available data from the literature - allow us to constrain the spectral energy distribution of this source to be of an ultra-luminous infrared galaxy (ULIRG) with a far-infrared luminosity of L^SF^_FIR_=2.4^+7.4^+_-2.1_x10^12^L_{sun}_, and hosting an obscured AGN. Such a source is thus able to power a hard photoionization plus outflow scenario to explain the extended Lyman-, HeII1640; and CIV1549 emission, and their kinematics. In addition, the two brightest detections at 850um (f_850_>18mJy) sit at the density peak of the LAEs; overdensity, likely pinpointing the core of the protocluster. Future multiwavelength and spectroscopic datasets targeting the full extent of the BOSS1441 overdensity have the potential to firmly characterize a cosmic nursery of giant elliptical galaxies, and ultimately of a massive cluster.2018A&A...620A.202Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/620/A202CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/620/A202https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/620/A202http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/620/A202https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/620/A202https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/620/A202http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/620/A202GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/620/A202/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A202/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A202/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A202/list?GETtext/xml+votable180.050000true220.3556440.061780.0055555555555555566/10573https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/620/A202?format=asciiMillimeterdefaultJ/A+A/620/A202/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation date (YYYY-MM-DDThh:mm:ss.sss)stime.epoch;obsnullablelambda[450/850] Observed wavelengthumem.wlintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar