J/ApJ/937/L33ivo://CDS.VizieR/J/ApJ/937/L33doi:10.26093/cds/vizier.19379033CDSSuess K.A.Bezanson R.Nelson E.J.Setton D.J.Price S.H.,van Dokkum P.Brammer G.Labbe I.Leja J.Miller T.B.Robertson B.,van der Wel A.Weaver J.R.Whitaker K.E.2025-06-19T20:10:43Z2024-09-09T13:03:29ZCDS support team

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

cds-question@unistra.frgalaxy-radiigalaxy-classification-systemsredshiftedstellar-massesinfrared-astronomyGalaxy sizes and their evolution over cosmic time have been studied for decades and serve as key tests of galaxy formation models. However, at z>~1 these studies have been limited by a lack of deep, high-resolution rest-frame infrared imaging that accurately traces stellar mass distributions. Here, we leverage the new capabilities of the James Webb Space Telescope (JWST) to measure the 4.4{mu}m sizes of ~1000 galaxies with logM_*_/M_{sun}_>=9 and 1.0<=z<=2.5 from public CEERS imaging in the Extended Groth Strip deep field. We compare the sizes of galaxies measured from NIRCam imaging at 4.4{mu}m ({lambda}_rest_~1.6{mu}m) with sizes measured at 1.5{mu}m ({lambda}_rest_~5500{AA}). We find that, on average, galaxy half-light radii are ~9% smaller at 4.4{mu}m than 1.5{mu}m in this sample. This size difference is markedly stronger at higher stellar masses and redder rest-frame V-J colors: galaxies with M_*_~10^11^M_{sun}_ have 4.4{mu}m sizes that are ~30% smaller than their 1.5{mu}m sizes. Our results indicate that galaxy mass profiles are significantly more compact than their rest-frame optical light profiles at cosmic noon, and demonstrate that spatial variations in age and attenuation are important, particularly for massive galaxies. The trend we find here impacts our understanding of the size growth and evolution of galaxies, and suggests that previous studies based on rest-frame optical light may not have captured the mass-weighted structural evolution of galaxies. This paper represents a first step toward a new understanding of the morphologies of early massive galaxies enabled by JWST's infrared window into the distant universe.2022ApJ...937L..33Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/937/L33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/427/1666 : Massive galaxies in CANDELS-UDS field (Bruce+, 2012)J/ApJS/203/24 : Structural param. of gal. in CANDELS (van der Wel+, 2012)J/ApJ/775/106 : CANDELS passive and massive early-type gal. (Cassata+, 2013)J/ApJ/763/73 : Surface density profiles of GOODS-S gal. (Szomoru+, 2013)J/ApJ/771/85 : Dynamical masses of z~2 quiescent gal. (van de Sande+, 2013)J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)J/ApJS/219/15 : Morphologies of z=0-10 gal. with HST data (Shibuya+, 2015)J/ApJS/225/27 : 3D-HST Survey: grism spectra master cat. (Momcheva+, 2016)J/ApJ/877/103 : Half-mass radii for galaxies at 1.0<=z<=2.5 (Suess+, 2019)J/ApJ/905/170 : Mass-based structural param. for 3D-HST gal. (Mosleh+, 2020)J/ApJ/901/74 : ALMA obs. of UDS & GOODS-S massive galaxies (Tadaki+, 2020)J/MNRAS/506/928 : Stellar mass-size relation for low M* gal. (Nedkova+, 2021)J/ApJ/925/34 : The COSMOS-DASH morphological catalog (Cutler+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/937/L33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/937/L33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/937/L33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/937/L33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/937/L33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/937/L33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/937/L33/table1 (Morphological measurements at 1.5um and 4.4um)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/937/L33/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/937/L33/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/937/L33/table1?GETtext/xml+votable180.050000true214.8849945152.826251980.0055555555555555566/11425https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/937/L33?format=asciiOpticalInfrareddefaultJ/ApJ/937/L33/table1Morphological measurements at 1.5um and 4.4umrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[13192/40427] Identifier from Skelton+ 2014, J/ApJS/214/24 (<[SWM2014] AEGIS NNNNN> in Simbad)meta.id;meta.mainintlogMass[9/11.5] log of stellar masslog(solMass)phys.massfloatzphot[1/3] Photometric redshiftsrc.redshiftfloatre1.5um[0.36/61.64] Effective radius at 1.5 micronarcsecphys.size.radius;em.IR.Jfloate_re1.5um[0/47] Effective radius error at 1.5 micronarcsecstat.error;phys.size.radius;em.IR.Jfloatn1.5um[0.2/8] Sersic index at 1.5 micronsrc.morph.param;em.IR.Jfloate_n1.5um[0/12] Sersic index error at 1.5 micronstat.error;src.morph.param;em.IR.Jfloatq1.5um[0.12/0.98] Axis ratio at 1.5 micronphys.size.axisRatio;em.IR.Jfloate_q1.5um[0/0.31] Axis ratio error at 1.5 micronstat.error;phys.size.axisRatio;em.IR.JfloatPA1.5um[-90/90] Position angle at 1.5 microndegpos.posAng;phys.angSize;em.IR.Jfloate_PA1.5um[0.01/29] Position angle error at 1.5 microndegstat.error;pos.posAng;em.IR.Jfloatre4.4um[0.38/62.7] Effective radius at 4.4 micronarcsecphys.size.radius;em.IR.4-8umfloate_re4.4um[0/32] Effective radius error at 4.4 microarcsecstat.error;phys.size.radius;em.IR.4-8umfloatn4.4um[0.2/8] Sersic index at 4.4 micronsrc.morph.param;em.IR.4-8umfloate_n4.4um[0/1.3] Sersic index error at 4.4 micronstat.error;src.morph.param;em.IR.4-8umfloatq4.4um[0.13/1] Axis ratio at 4.4 micronphys.size.axisRatio;em.IR.4-8umfloate_q4.4um[0/0.2] Axis ratio error at 4.4 micronstat.error;phys.size.axisRatio;em.IR.4-8umfloatPA4.4um[-90/90] Position angle at 4.4 microndegpos.posAng;phys.angSize;em.IR.4-8umfloate_PA4.4um[0.01/30] Position angle error at 4.4 microndegstat.error;pos.posAng;em.IR.4-8umfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 3D-HST CANDELS cat. (Skelton+ 2014, J/ApJS/214/24), AEGIS field (right ascension part)degpos.eq.ra;meta.main_DEPositions from 3D-HST CANDELS cat. (Skelton+ 2014, J/ApJS/214/24), AEGIS field (declination part)degpos.eq.dec;meta.main