Stellar half-mass radii for 3DHST+CANDELS gal. Virtual Observatory Resource

Authors
  1. van der Wel A.
  2. Martorano M.
  3. Haussler B.
  4. Nedkova K.V.
  5. Miller T.B.,Brammer G.B.
  6. van de Ven G.
  7. Leja J.
  8. Bezanson R.S.
  9. Muzzin A.,Marchesini D.
  10. de Graaff A.
  11. Nelson E.J.
  12. Kriek M.
  13. Bell E.F.
  14. Franx M.
  15. Published by
    CDS
Abstract

We use CEERS JWST/NIRCam imaging to measure rest-frame near-IR light profiles of 435 M*>10^10^M_{sun}_ galaxies in the redshift range of 0.5<z<2.3. We compare the resulting rest-frame 1.5-2{mu}m half-light radii (RNIR) with stellar half-mass radii (R_M*_) derived with multicolor light profiles from CANDELS Hubble Space Telescope imaging. In general agreement with previous work, we find that RNIR and R_M*_ are up to 40% smaller than the rest-frame optical half-light radius Ropt. The agreement between RNIR and R_M*_ is excellent, with a negligible systematic offset (<0.03dex) up to z=2 for quiescent galaxies and up to z=1.5 for star-forming galaxies. We also deproject the profiles to estimate R_M*,3D_, the radius of a sphere containing 50% of the stellar mass. We present the R-M* distribution of galaxies at 0.5<z<1.5, comparing Ropt, R_M*_, and R_M*,3D_. The slope is significantly flatter for R_M*_ and R_M*,3D_ compared to Ropt, mostly due to downward shifts in size for massive star-forming galaxies, while R_M*_ and R_M*,3D_ do not show markedly different trends. Finally, we show rapid evolution of the size (R{propto}(1+z)^-1.7+/-0.1^) of massive (M*>10^11^M_{sun}_) quiescent galaxies between z=0.5 and z=2.3, again comparing Ropt, R_M*_, and R_M*,3D_. We conclude that the main tenets of the evolution of the size narrative established over the past 20yr, based on rest-frame optical light profile analysis, still hold in the era of JWST/NIRCam observations in the rest-frame near-IR.

Keywords
  1. galaxies
  2. infrared-sources
  3. galaxy-radii
  4. redshifted
  5. surveys
Bibliographic source Bibcode
2024ApJ...960...53V
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History

2026-04-14T08:20:14Z
Resource record created
2026-04-14T08:20:14Z
Created
2026-05-04T07:43:19Z
Updated

Contact

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Postal Address
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