Table · dataset · 2025
Color gradients & half-mass radii of 3D-HST gal.
Listed in IVOA Registry (Virtual Observatory)
Recent studies have indicated that the ratio between half-mass and half-light radii, r_mass_/r_light_, varies significantly as a function of stellar mass and redshift, complicating the interpretation of the ubiquitous r_light_-M_*_ relation.
Description
To investigate, in this study we construct the light and color profiles of ~3000 galaxies at 1<z<2 with logM_*_/M_{sun}_>10.25 using imcascade, a Bayesian implementation of the Multi-Gaussian Expansion (MGE) technique. imcascade flexibly represents galaxy profiles using a series of Gaussians, free of any a priori parameterization.
We find that both star-forming and quiescent galaxies have, on average, negative color gradients. For star-forming galaxies, we find steeper gradients that evolve with redshift and correlate with dust content. Using the color gradients as a proxy for gradients in the M/L ratio, we measure half-mass radii for our sample of galaxies.
Read the rest (2 more)
There is significant scatter in individual rmass/rlight ratios, which is correlated with variation in the color gradients. We find that the median rmass/rlight ratio evolves from 0.75 at z=2 to 0.5 at z=1, consistent with previous results. We characterize the r_mass_-M_*_ relation, and we find that it has a shallower slope and shows less redshift evolution than the r_light_-M_*_ relation.
This applies both to star-forming and quiescent galaxies. We discuss some of the implications of using rmass instead of rlight, including an investigation of the size-inclination bias and a comparison to numerical simulations.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/945/155 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJ...945..155M ui.adsabs.harvard.edu/abs/2023ApJ...945..155M ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apj/945/155 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/945/155 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |