J/MNRAS/516/2162ivo://CDS.VizieR/J/MNRAS/516/2162CDSNeufeld C.Strait V.Bradac M.Lemaux B.C.Coe D.Yang L.Treu T.,Zitrin A.Nonino M.Bradley L.Sharon K.2026-03-04T09:10:52Z2026-03-04T09:49:27ZCDS support team

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

cds-question@unistra.frgalaxiesgravitational-lensingphotometryinfrared-astronomyvisible-astronomyabsolute-magnitudeultraviolet-astronomyredshiftedastrometrystellar-massesgalaxy-radiiline-intensitiesspectroscopystar-forming-regionsWe present size measurements of 78 high-redshift (z => 5.5) galaxy candidates from the Reionization Lensing Cluster Survey (RELICS). These distant galaxies are well resolved due to the gravitational lensing power of foreground galaxy clusters, imaged by the Hubble Space Telescope and the Spitzer Space Telescope. We compute sizes using the forward-modelling code lenstruction and account for magnification using public lens models. The resulting size-magnitude measurements confirm the existence of many small galaxies with effective radii R_eff_ < 200 pc in the early Universe, in agreement with previous studies. In addition, we highlight compact and highly star-forming sources with star formation rate surface densities {Sigma}_SFR_ > 10M_{sun}_yr^-1^kpc^-2^ as possible Lyman continuum leaking candidates that could be major contributors to the process of reionization. Future spectroscopic follow-up of these compact galaxies (e.g. with the James Webb Space Telescope) will further clarify their role in reionization and the physics of early star formation.2022MNRAS.516.2162Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/2162CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/501/1028 : Galaxies at z=1-3 lensed by six HFF clusters (Yang+, 2021)J/MNRAS/428/1460 : Massive early-type galaxies (Buitrago+, 2013)J/ApJ/927/81 : HFF cluster observations of z~4-8 galaxies (Bouwens+, 2022)J/ApJ/855/4 : Lyman break galaxies at z~6-9 from HFF (Kawamata+, 2018)J/ApJ/884/85 : RELICS: Reionization Lensing Cluster Survey (Coe+, 2019)J/ApJ/910/135 : RELICS 6<~z<=8 galaxies with Spitzer & HST obs.J/ApJ/889/189 : Brightest high-z galaxies in RELICS clusters (Salmon+, 2020)J/ApJ/835/113 : Galaxies >~6 from the Hubble Frontier FieldsJ/ApJ/854/73 : Full-data results of HFF: galaxies z~6-9 (Ishigaki+, 2018)J/ApJ/855/4 : Lyman break galaxies at z~6-9 from HFF (Kawamata+, 2018)J/ApJ/843/41 : HST/WFC3 obs. of z~2-8 galaxies in 4 HFF clustersJ/ApJ/839/L11 : HST strong lensing analysis of PLCKG287.0+32.9J/ApJS/219/15 : Morphologies of z=0-10 galaxies with HST dataJ/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/516/2162https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/516/2162http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/516/2162https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/516/2162https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/516/2162http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/516/2162GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/516/2162/table (Size measurements and other selected properties of high-redshift galaxy sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/2162/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/2162/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/2162/table?GETtext/xml+votable180.050000true10.8496014-20.60416520.0055555555555555566/97 821 2488 4406 4512 10664 11080 16702 17222 17472 17499 18746 19009 19848 19858 20536 20735 22330 24735 26756 30946 33692 34726 35041 35043 35147 36082 37395 39043https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/516/2162?format=asciiUVOpticalInfrareddefaultJ/MNRAS/516/2162/tableSize measurements and other selected properties of high-redshift galaxy sourcesNameObject name identifier (id)meta.id;meta.maincharRELICS2019Display the RELICS data from Coe et al. 2019ApJ...884...85C, Cat. J/ApJ/884/85meta.ref.urlcharRELICS2020Display the RELICS data from Salmon et al. 2020ApJ...889..189S, Cat. J/ApJ/889/189meta.ref.urlcharRELICS2021Display the RELICS data from Strait et al. 2021ApJ...910..135S, Cat. J/ApJ/910/135meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) (ra)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (dec)degpos.eq.dec;meta.mainzpeakThe peak redshift from the PDF of redshift distribution (z_peak_) (1)src.redshift.photfloatzmedThe median redshift also from PDF of redshift distribution (z_med)src.redshift.photfloatUVMagIntrinsic dereshifted absolute UV AB magnitude (absmag)magphys.magAbs;em.UVdoubleM*Median stellar mass obtained from method A of Strait et al. 2020ApJ...888..124S (smass)solMassphys.mass;stat.mediandoubleB_M*[] Upper 68 percent confidence limits of M* corresponding to 84th percentile of the posterior (smass_u68)solMassphys.mass;stat.maxdoubleb_M*Lower 68 percent confidence limits of M* corresponding to 16th percentile of the posterior (smass_l68)solMassphys.mass;stat.mindoubleR*Measured Sersic radius as the semimajor half-light or effective radius (r_eff)kpcphys.size.radiusdoubleB_R*Upper 68 percent confidence limits of R* corresponding to 84th percentile of the posterior (r_eff_u68)kpcphys.size.radius;stat.maxdoubleb_R*Lower 68 percent confidence limits of R* corresponding to 16th percentile of the posterior (r_eff_l68)kpcphys.size.radius;stat.mindoubleRcCircularized effective radii (r_eff_circ) (2)kpcphysdoubleB_RcUpper 68 percent confidence limits of Rcirc corresponding to 84th percentile of the posterior (r_eff_circ_u68)kpcphys.size.radius;stat.maxdoubleb_RcLower 68 percent confidence limits of Rcirc corresponding to 16th percentile of the posterior (r_eff_circ_l68)kpcphys.size.radius;stat.mindoubleSFRStar formation rate computed with method described in Strait et al. 2020ApJ...888..124S (sfr)solMass/yrphys.SFRdoubleB_SFR[] Upper 68 percent confidence limits of SFR corresponding to 84th percentile of the posterior (sfr_u68)solMass/yrphys.SFR;stat.maxdoubleb_SFRLower 68 percent confidence limits of SFR corresponding to 84th percentile of the posterior (sfr_l68)solMass/yrphys.SFR;stat.mindoubleSSFRSFR surface density as {Sigma}SFR = SFR/2{pi}R_circ_ (sfrd)solMass.yr**-1.kpc**-2phys.SFRdoubleB_SSFR[] Upper 68 percent confidence limits of SigmaSFR corresponding to 84th percentile of the posterior (sfrd_u68)solMass.yr**-1.kpc**-2phys.SFR;stat.maxdoubleb_SSFRLower 68 percent confidence limits of SigmaSFR corresponding to 84th percentile of the posterior (sfrd_l68)solMass.yr**-1.kpc**-2phys.SFR;stat.mindoublemuMagnification factor {mu} computed from glafic and lenstool lens model by relics team to contruct magnification maps (mu)meta.modelled;src.morph.paramfloatEW? The [OIII] + H{beta} lines combined equivalent width in rest-frame for IRAC S/N > 3 detections (EW_OIII+Hb) (3)0.1nmspect.line.eqWidthdoublenullableB_EW? Upper 68 percent confidence limits of EW[OIII]+Hb corresponding to 84th percent of the posterior (EW_OIII+Hb_u68)0.1nmspect.line.eqWidth;stat.maxdoublenullableb_EW? Lower 68 percent confidence limits of EW[OIII]+Hb corresponding to 16th percent of the posterior (EW_OIII+Hb_l68)0.1nmspect.line.eqWidth;stat.mindoublenullable