J/A+A/614/A118ivo://CDS.VizieR/J/A+A/614/A118doi:10.26093/cds/vizier.36140118CDSAdam R.Hahn O.Ruppin F.Ade P.Andre P.Arnaud M.Bartalucci I.,Beelen A.Benoit A.Bideaud A.Billot N.Bourrion O.Calvo M.,Catalano A.Coiffard G.Comis B.D'Addabbo A.Desert F.-X.Doyle S.,Ferrari C.Goupy J.Kramer C.Lagache G.Leclercq S.Lestrade J.-F.,Macias-Perez J.F.Martinez Aviles G.Martizzi D.Maurogordato S.,Mauskopf P.Mayet F.Monfardini A.Pajot F.Pascale E.Perotto L.,Pisano G.Pointecouteau E.Ponthieu N.Pratt G.W.Reveret V.Ricci M.,Ritacco A.Rodriguez L.Romero C.Roussel H.Schuster K.Sievers A.,Triqueneaux S.Tucker C.Wu H.-Y.Zylka R.2018-09-25T15:00:38Z2018-06-25T07:51:38ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-continuum-emissionSubstructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z=0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z=0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z=0.89), we detect a ridge pressure gradient of ~45-arcsec (360kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release.2018A&A...614A.118Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/614/A118CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/576/A12 : NIKA maps of ClG J1226.9+3332 at 150 and 250GHz (Adam+, 2015)http://lpsc.in2p3.fr/NIKA2LPSZ/nika2sz.release.php : Explanatory supplementhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/614/A118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/614/A118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/614/A118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/614/A118https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/614/A118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/614/A118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/614/A118/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/614/A118/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/614/A118/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/614/A118/list?GETtext/xml+votable180.050000true186.7416733.544440.0055555555555555566/6383 8921 9060 25675 28535 32463https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/614/A118?format=asciiRadiodefaultJ/A+A/614/A118/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.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharJ/A+A/614/A118/beam150GHz beam (Beam150GHz.fits)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRadius? Radius (RADIUS_ARCSEC)arcsecphys.angSizedoublenullableBeam? Beam (BEAM)meta.notedoublenullablee_Beam? Beam error (BEAM_ERROR)stat.errordoublenullableJ/A+A/614/A118/ftmacs14*Transfer function of MACS J1423.8+2404 at 150GHz (TransferFunction150GHz_MACSJ1424.fits)recnoRecord number assigned by the VizieR team. 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Should Not be used for identification.meta.recordintWaveWave number (WAVE_NUMBER_ARCSEC)arcsecem.freqdoubleTFTransfer function (TF)instr.det.psfdoublee_TFError on TF (TF_ERR)stat.errordoubleJ/A+A/614/A118/ftpsz045*Transfer function of PSZ1 G045.85+57.71 at 150GHz (TransferFunction150GHz_PSZ1G045.fits)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWaveWave number (WAVE_NUMBER_ARCSEC)arcsecem.freqdoubleTFTransfer function (TF)instr.det.psfdoublee_TFError on TF (TF_ERR)stat.errordoubleJ/A+A/614/A118/ftclj*Transfer function of CLJ1226.9+3332 at 150GHz (TransferFunction150GHz_CLJ1227.fits)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWaveWave number (WAVE_NUMBER_ARCSEC)arcsecem.freqdoubleTFTransfer function (TF)instr.det.psfdoublee_TFError on TF (TF_ERR)stat.errordouble