J/A+A/628/A13ivo://CDS.VizieR/J/A+A/628/A13doi:10.26093/cds/vizier.36280013CDSStreblyanska A.Aguado-Barahona A.Ferragamo A.Barrena R.,Rubino-Martin J.A.Tramonte D.Genova-Santos R.T.Lietzen H.2020-05-07T09:09:24Z2020-03-27T08:09:09ZCDS support team

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

cds-question@unistra.frgalaxy-clustersredshiftedAims. The second catalogue of Planck Sunyaev-Zeldovich (SZ) sources, hereafter PSZ2, is the largest sample of galaxy clusters selected through their SZ signature in the full sky. At the time of publication, 21% of these objects had no known counterpart at other wavelengths. Using telescopes at the Canary Island observatories, we conducted the long-term observational programme 128-MULTIPLE-16/15B (hereafter LP15), a large and complete optical follow-up campaign of all the unidentified PSZ2 sources in the northern sky, with declinations above -15{deg} and no correspondence in the first Planck catalogue PSZ1. The main aim of LP15 is to validate all those SZ cluster candidates, and to contribute to the characterization of the actual purity and completeness of full Planck SZ sample. In this paper, we describe the full programme and present the results of the first year of observations. Methods. The LP15 programme was awarded 44 observing nights, spread over two years in three telescopes at the Roque de los Muchachos Observatory. The full LP15 sample comprises 190 previously unidentified PSZ2 sources. For each target, we performed deep optical imaging and spectroscopy. Our validation procedure combined this optical information with SZ emission as traced by the publicly available Planck Compton y-maps. The final classification of the new galaxy clusters as optical counterparts of the SZ signal is established according to several quantitative criteria based on the redshift, velocity dispersion, and richness of the clusters. Results. This paper presents the detailed study of 106 objects out of the LP15 sample, corresponding to all the observations carried out during the first year of the programme. We confirmed the optical counterpart for 41 new PSZ2 sources, 31 of them being validated using also velocity dispersion based on our spectroscopic information. This is the largest dataset of newly confirmed PSZ2 sources without any previous optical information. All the confirmed counterparts are rich structures (i.e. they show high velocity dispersion), and are well aligned with the nominal Planck coordinates (i.e. ~70% of them are located at less than 3' distance). In total, 65 SZ sources are classified as unconfirmed, 57 of them being due to the absence of an optical over-density, and eight of them due to a weak association with the observed SZ decrement. Most of the sources with no optical counterpart are located at low galactic latitudes and present strong galactic cirrus in the optical images, the dust contamination being the most probable explanation for their inclusion in the PSZ2 catalogue.2019A&A...628A..13Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/628/A13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/594/A27 : Planck Sunyaev-Zeldovich sources (PSZ2) (Planck+, 2016)J/A+A/631/A148 : PSZ2 cluster candidates. II. (Aguado-Barahona+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/628/A13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/628/A13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/628/A13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/628/A13https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/628/A13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/628/A13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/628/A13/tablea1 (*107 PSZ2 sources discussed in this paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/628/A13/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/628/A13/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/628/A13/tablea1?GETtext/xml+votable180.050000true244.586-4.18930560.0055555555555555566/53 59 190 322 446 462 488 740 1191 2411 2628 4092 6102 6107 7405 8149 8188 8700 9310 9396 9716 10039 11431 11492 11642 11708 11974 11995 12559 12673 12705 13011 13015 13110 13525 13725 13728 13850 13877 13896 13918 13955 14147 14848 14885 15056 15059 15161 15272 15515 15595 15838 15892 15915 15962 15984 16095 16118 16239 16377 17597 18270 18291 18427 18698 18766 19116 19438 19543 19677-19678 19766 19898 20000 20063 20149 20206 23461 25512 27996 28015 29735 29774 29965 29995 30032 30081-30082 30171 30378 30956 31093 31885 31936 31973 31990 32139 32144 32168 32223 32599 44896 48621 48977https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/628/A13?format=asciidefaultJ/A+A/628/A13/tablea1*107 PSZ2 sources discussed in this paperNotesNotesmeta.notecharFlagFlag (2)meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDOfficial identification numbermeta.idintm_ID[AB] Multiplicity index on ID for multiple counterpartsmeta.code.multipcharn_IDNotes on ID (1)meta.notecharPSZ2PSZ2 designation, PSZ2 GLLL.ll+BB.bbmeta.id;meta.maincharS/N? SZ signal-to-noise ratiostat.snrfloatnullableQual? Neural network quality flag (best = 0)meta.code.qualfloatnullableRAJ2000? BGC Right ascension (J2000)pos.eq.ranullableDEJ2000? BGC Declination (J2000)pos.eq.decnullableDist? Distance between Planck and the optical center reported in this workarcminpos.angDistancefloatnullablezph? Photometric redshift of the clustersrc.redshiftfloatnullablen_zph[bc] Note on zph (1)meta.notecharzsp? Mean spectroscopic redshift of the clustersrc.redshiftfloatnullablezsp2? BCG spectroscopic redshift (-1 if absence of the apparent BCG)src.redshift;pos.heliocentricfloatnullablensp? Number of galaxies with spectroscopic measurementmeta.numberintnullableR? Optical richness of the cluster (-1 when not could be estimated)src.class.richnessfloatnullablen_R[ag] Note on R (1)meta.notechars_R[]? Significance of optical richness of the cluster (-1 when not could be estimated)stat.fit.goodness;src.class.richnessfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.main