J/A+A/587/A23ivo://CDS.VizieR/J/A+A/587/A23doi:10.26093/cds/vizier.35870023CDSvan der Burg R.F.J.Aussel H.Pratt G.W.Arnaud M.Melin J.-B.,Aghanim N.Barrena R.Dahle H.Douspis M.Ferragamo A.Fromenteau S.,Herbonnet R.Hurier G.Pointecouteau E.Rubino-Martin J.A.,Streblyanska A.2019-08-09T16:07:41Z2016-02-15T07:51:15ZCDS support team

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

cds-question@unistra.frgalaxy-clustersphotometryThe Planck catalogue of SZ sources limits itself to a significance threshold of 4.5 to ensure a low contamination rate by false cluster candidates. This means that only the most massive clusters at redshift z>0.5, and in particular z>0.7, are expected to enter into the catalogue, with a large number of systems in that redshift regime being expected around and just below that threshold. In this paper, we follow-up a sample of SZ sources from the Planck SZ catalogues from 2013 and 2015. In the latter maps, we consider detections around and at lower significance than the threshold adopted by the Planck Collaboration. To keep the contamination rate low, our 28 candidates are chosen to have significant WISE detections, in combination with non-detections in SDSS/DSS, which effectively selects galaxy cluster candidates at redshifts z>~0.5. By taking r- and z-band imaging with MegaCam@CFHT, we bridge the 4000{AA} rest-frame break over a significant redshift range, thus allowing accurate redshift estimates of red-sequence cluster galaxies up to z~0.8. After discussing the possibility that an overdensity of galaxies coincides -by chance- with a Planck SZ detection, we confirm that 16 of the candidates have likely optical counterparts to their SZ signals, 13 (6) of which have an estimated redshift z>0.5 (z>0.7). The richnesses of these systems are generally lower than expected given the halo masses estimated from the Planck maps. However, when we follow a simplistic model to correct for Eddington bias in the SZ halo mass proxy, the richnesses are consistent with a reference mass-richness relation established for clusters detected at higher significance. This illustrates the benefit of an optical follow-up, not only to obtain redshift estimates, but also to provide an independent mass proxy that is not based on the same data the clusters are detected with, and thus not subject to Eddington bias2016A&A...587A..23Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/587/A23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/88 : Planck Early Release Compact Source Catalogue (Planck, 2011)VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)J/A+A/536/A8 : Planck early results. VIII. ESZ sample. (Planck+, 2011)J/A+A/578/A44 : Map of foreground masks for Planck (Axelsson+, 2015)J/A+A/581/A14 : Updated Planck catalogue PSZ1 (Planck+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/587/A23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/587/A23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/587/A23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/587/A23https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/587/A23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/587/A23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/587/A23/sources (The 28 cluster candidates studied here)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A23/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A23/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A23/sources?GETtext/xml+votable180.050000true312.407917-18.9326670.005555555555555556Cone search capability for table J/A+A/587/A23/list (List of fits files in r and z bands)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/587/A23/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/587/A23/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/587/A23/list?GETtext/xml+votable180.050000true312.38919-18.952930.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/587/A236/605 3521 9164 9972 10070 12300 16116 17047 17064 17980 18727 18879 19248 20003 20117 23366 27374 28417 31583 31937 31988 32197 32208 32325 36222 36621 48622 48710 48732https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/587/A23?format=asciidefaultJ/A+A/587/A23/sourcesThe 28 cluster candidates studied hererecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStatus[CI] Confirmed or Invalided candidatemeta.codecharNameSource namemeta.id;meta.maincharRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainfitsDisplay this list of fits files for this sourcemeta.ref.urlcharJ/A+A/587/A23/listList of fits files in r and z bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (PLCKGLLL.ll+BB.bb, PSZ1GLLL.ll+BB.bb or PSZ2GLLL.ll+BB.bb)meta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainscale[0.185] Scale of the imagearcsec/pixinstr.scalefloatNx[5000] Number of pixels along X-axismeta.numberintNy[5000] Number of pixels along Y-axismeta.numberintsize[97757/98004] Size of FITS fileKibytephys.size;meta.fitsintFileName1Name of FITS image file, in subdirectory fitsmeta.id;meta.fitscharFileName2Name of FITS weight file, in subdirectory fitsphys.atmol.weight;meta.fitschar