J/MNRAS/549/G879ivo://CDS.VizieR/J/MNRAS/549/G879CDSPhuravhathu D.G.Hilton M.Sikhosana S.P.Klutse D.Y.Knowles K.,van Marrewijk J.Mroczkowski T.Oozeer N.Partridge B.Perrott Y.C.,Sifon C.Sureshkumar U.2026-05-29T08:09:21Z2026-05-29T09:08:24ZCDS support team

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

cds-question@unistra.frgalaxy-clustersradio-sourcesradio-continuum-emissionintergalactic-mediumWe present MeerKAT L-band (central frequency 1.284GHz) observations of a sample of 30 of the most massive Sunyaev-Zel'dovich selected galaxy clusters at z>1 from the ACT DR5 catalogue, providing the first statistical constraints on cluster-scale diffuse radio emission beyond this redshift. Diffuse radio halos are detected in eight clusters (27%), while 21 systems (70%) show no central diffuse emission down to some of the deepest upper limits yet obtained at these redshifts; one additional target is excluded because of poor data quality. The detected halos lie along the established P_1.4GHz_-M_500_ scaling relation measured at low redshift, whereas non-detections populate the lower envelope of the radio power-mass plane, broadly consistent with the known bimodality in this relation. No cluster-scale radio relics or mini-halos are identified in the sample. Mock halo injection simulations are used to derive 3{sigma} upper limits for 18 clusters, showing that a substantial fraction of the high-redshift population remains below current MeerKAT sensitivity at L-band.2026MNRAS.549g.879Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/549/G879CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/549/G879https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/549/G879http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/549/G879https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/549/G879https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/549/G879http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/549/G879GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/549/G879/catalog (MeerKAT L-band catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/549/G879/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/549/G879/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/549/G879/catalog?GETtext/xml+votable180.050000true1.6933870518316.658244129890.005555555555555556Cone search capability for table J/MNRAS/549/G879/sources (List of sources with fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/549/G879/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/549/G879/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/549/G879/sources?GETtext/xml+votable180.050000true0.965833-16.7018060.005555555555555556Cone search capability for table J/MNRAS/549/G879/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/549/G879/list?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/549/G879/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/549/G879/list?GETtext/xml+votable180.050000true316.51776-58.743210.0055555555555555565/1081 1083 2053 2064 2122 2144-2145 3169 3172 4400 4402 4528 4602-4603 4748-4749 4925 5158-5159 5164 5803 5806 6748-6749 6779 6782 6797 6799 6810 6876 6878 7855 8404-8406 8777-8778 8796-8797 8916 9125 9127 9190-9191 11463 11468-11469 11543 11586 6/5 16-18 20 4161 4164-4165 4302-4303 4321-4323 4329 4336 4338 4344 8209 8221 8264 8405 8492 8494-8495 8585 8588 8592 12591 12602-12603 12685 12692 12694 12696-12698 12700 17158 17514 17557-17559 17564-17565 17567 17606 17612 17614 17632 17983 18026-18027 18068-18069 18071 18077 18116 18118-18121 18123-18124 18365 18367 18402-18403 18406 18969-18971 18974 18981 18983 19000-19001 19004 19697 19699 19776-19777 19779-19780 20621 20623 20625-20627 20630 20645 20660 23207 23218-23219 23228 23230 26970-26971 26974 26981 26983 27000-27001 27003-27006 27110-27111 27113 27115 27122 27187 27193 27232 27234-27235 27285 27328 27371 27374-27375 27460-27461 27463 27472-27474 27482 27493-27495 27500-27501 27503 27510 27516 27682 27779 27782-27783 27785 27788-27789 27882-27883 27886 28224-28225 28228 31419 31464 31466-31467 33275 33607 33612-33613 33615 33628-33630 33875 33878-33879 33881 33884-33885 34050 34935 35083 35086 35105-35107 35116-35118 35163-35164 35166-35167 35192-35193 35195-35197 35200-35201 35322-35323 35653-35655 35660-35661 35663 35668 35670 35672-35674 35676 35850 35872 36137 36139-36140 36142 36225 36228 36414 36497-36499 36504-36505 36507 36546 36552 36749 36751 36753-36755 36758 36784-36785 36787-36788 45849-45851 45861 45863 45880-45881 45884 45898 45903 45920 46196-46197 46338-46339 46342-46343 46348-46350 46354 46368-46369 485428.415108227908925e-25 8.501247208152277e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/549/G879?format=asciiRadiodefaultJ/MNRAS/549/G879/catalogMeerKAT L-band catalogIslIdPyBDSF island ID (Isl_id)obs.fieldintIslmeanAverage background mean of island (Isl_mean)mJy/beaminstr.backgrounddoubleResIslrmsAverage residual background RMS noise of island (Resid_Isl_rms)mJy/beaminstr.backgrounddoubleResIslmeanAverage residual background mean of island (Resid_Isl_mean)mJy/beaminstr.backgrounddoubleSCode[SMC] PyBDSF source flag (S_Code) (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceIdPyBDSF source ID (Source_id)meta.id;meta.mainintRAJ2000[] Right Ascension (J2000) (RA)degpos.eq.ra;meta.mainindexede_RAJ2000Error in Right Ascension (E_RA)degstat.error;pos.eq.radoubleDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainindexede_DEJ2000Error in Declination (E_DEC)degstat.error;pos.eq.decdoubleFtotTotal flux density at 1.284GHz (Total_flux)mJyphot.flux.density;em.radio.750-1500MHzdoublee_FtotError on total flux density (E_Total_flux)mJystat.errordoubleFpeakPeak flux density at 1.284GHz (Peak_flux)mJy/beamphot.flux.density;em.radio.750-1500MHzdoublee_FpeakError on peak flux density (E_Peak_flux)mJy/beamstat.errordoubleRAmdegRight Ascension of maximum (J2000) (RA_max)degpos.eq.rae_RAmdegError on right ascension of maximum (E_RA_max)degstat.error;pos.eq.radoubleDEmdegDeclination of maximum (J2000) (DEC_max)degpos.eq.dece_DEmdegError on declination of maximum (E_DEC_max)degstat.errordoubleMajMajor axis (Maj)arcsecphys.angSizedoublee_MajError on major axis (E_Maj)arcsecstat.errordoubleMinMinor axis (Min)arcsecphys.angSize;srcdoublee_MinError on minor axis (E_Min)arcsecstat.error;stat.mindoublePAPosition angle (PA)degpos.posAngdoublee_PAError on position angle (E_PA)degstat.errordoubleMajIPImage plane major axis (Maj_img_plane)arcsecphys.angSizedoublee_MajIPError on image plane major axis (E_Maj_img_plane)arcsecstat.errordoubleMinIPImage plane minor axis (Min_img_plane)arcsecphys.angSize;srcdoublee_MinIPError on image plane minor axis (E_Min_img_plane)arcsecstat.errordoublePAIPImage plane Image plane position angle (PA_img_plane)degpos.posAng;obs.imagedoublee_PAIPError on image plane Image plane position angle (E_PA_img_plane)degstat.errordoubleDCMajDeconvolved major axis (DC_Maj)arcsecphys.angSizedoublee_DCMajError on deconvolved major axis (E_DC_Maj)arcsecstat.errordoubleDCMinDeconvolved minor axis (DC_Min)arcsecphys.angSize;srcdoublee_DCMinError on deconvolved minor axis (E_DC_Min)arcsecstat.errordoubleDCPADeconvolved position angle (DC_PA)degpos.posAngdoublee_DCPAError on deconvolved position angle (E_DC_PA)degstat.errordoubleDCMajIPImage plane deconvolved major axis (DC_Maj_img_plane)arcsecphys.angSizedoublee_DCMajIPError on image plane deconvolved major axis (E_DC_Maj_img_plane)arcsecstat.errordoubleDCMinIpImage plane deconvolved minor axis (DC_Min_img_plane)arcsecphys.angSize;srcdoublee_DCMinIpError on image plane deconvolved minor axis (E_DC_Min_img_plane)arcsecstat.errordoubleDCPAIPImage plane deconvolved position angle (DC_PA_img_plane)degpos.posAng;obs.imagedoublee_DCPAIPError on image plane deconvolved position angle (E_DC_PA_img_plane)degstat.errordoubleFtotIslTotal flux of island at 1.27GHz (Isl_Total_flux)mJyphot.flux.density;em.radio.750-1500MHzdoublee_FtotIslError on total flux of island (E_Isl_Total_flux)mJystat.errordoubleIslrmsAverage background RMS noise of island (Isl_rms)mJy/beaminstr.backgrounddoubleJ/MNRAS/549/G879/sourcesList of sources with fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJ/MNRAS/549/G879/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharRAJ2000Right 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 datestime.epoch;obsnullableFreqObserved frequencyGHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitschar