Transition from outside-in to inside-out at z~2 Virtual Observatory Resource

Authors
  1. Song J.
  2. Wang E.
  3. Jia C.
  4. Lyu C.
  5. Chen Y.
  6. Wang J.
  7. Li F.
  8. Ding W.
  9. Fang G.,Kong X.
  10. Published by
    CDS
Abstract

By combining high-resolution observations from JWST and HST, we have measured the stellar masses, star formation rates (SFRs), and multi- wavelength morphologies of galaxies in the CANDELS fields. Furthermore, based on rest-frame 1um morphologies, we have derived spatially resolved stellar mass and SFR surface density (Sigma_*_ and Sigma_SFR_) profiles for 46313 galaxies with reliable structural measurements at 0<z<4 and log(M*/M_{sun}_)>8, and provide the corresponding catalogue. For star-forming galaxies (SFGs), our results show excellent consistency with previous studies in terms of the star formation main sequence and the size-mass relation, demonstrating the robustness of our stellar mass and SFR measurements. For spatially resolved profiles, we find that at higher redshifts (z>2.5), the median radial profile of Sigma_SFR_ is nearly parallel to but slightly steeper than that of Sigma_*_. This results in mildly negative gradients in the specific SFR (sSFR) profiles across all stellar mass bins considered. These findings indicate that galaxies at z>2.5 cannot grow in size via only in-situ star formation, challenging the understanding of galaxy size evolution beyond the cosmic noon. In contrast, at z<2.0, the sSFR profiles transition to exhibit more and more positive gradients at lower redshifts, consistent with an inside-out growth scenario where star formation preferentially expands the galactic outskirts.

Keywords
  1. galaxies
  2. stellar-masses
  3. redshifted
  4. galaxy-classification-systems
  5. infrared-astronomy
  6. visible-astronomy
Bibliographic source Bibcode
2026A&A...709A.205S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A205
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/709/A205

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A205
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A205
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IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/709/A205/catalog?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/709/A205/catalog?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/709/A205/catalog?

History

2026-05-19T12:02:32Z
Resource record created
2026-05-19T11:03:01Z
Updated
2026-05-19T12:02:32Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr