REVIEW 11 cited by
COSMOS-Web: Unraveling the Evolution of Galaxy Size and Related Properties at $2<z<10$
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We measure galaxy sizes from $2 < z < 10$ using COSMOS-Web, the largest-area JWST imaging survey to date, covering $\sim$0.54 deg$^2$. We analyze the rest-frame optical (~5000A) size evolution and its scaling relation with stellar mass ($R_e\propto M_*^\alpha$) for star-forming and quiescent galaxies. For star-forming galaxies, the slope $\alpha$ remains approximately 0.20 at $2 < z < 8$, showing no significant evolution over this redshift range. At higher redshifts, the slopes are $-0.13 \pm 0.15$ and $0.37 \pm 0.36$ for $8 < z < 9$ and $9 < z < 10$, respectively. At fixed galaxy mass, the size evolution for star-forming galaxies follows $R_e \propto (1+z)^{-\beta}$, with $\beta = 1.21 \pm 0.05$. For quiescent galaxies, the slope is steeper $\alpha\sim 0.5$-$0.8$ at $2 < z < 5$, and $\beta=0.81\pm0.26$. We find that the size-mass relation is consistent between UV and optical at $z < 8$ for star-forming galaxies. However, we observe a decrease in the slope from UV to optical at $z > 8$, with a tentative negative slope in the optical at $8 < z < 9$, suggesting a complex interplay between intrinsic galaxy properties and observational effects such as dust attenuation. We discuss the ratio between galaxies' half-light radius, and underlying halos' virial radius, $R_{vir}$, and find the median value of $R_e/R_{vir}=2.7\%$. The star formation rate surface density evolves as $\log\Sigma_\text{SFR} = (0.20\pm0.08)\,z+(-0.65\pm0.51)$, and the $\Sigma_\text{SFR}$-$M_*$ relation remains flat at $2<z<10$. Lastly, we identify a threshold in stellar mass surface density $\log\Sigma_e\sim9.5$-$10\, M_{\odot}/kpc^2$ marking the transition to compact, quenched galaxies from extended, star-forming progenitors. In summary, our findings show that the extensive COSMOS-Web dataset at $z > 3$ provides new insights into galaxy size and related properties in the rest-frame optical.
Forward citations
Cited by 11 Pith papers
-
RABBITS IV: Stellar feedback and SMBH merging time-scales in the sub-Milky Way mass regime
Stronger stellar feedback lowers central stellar densities in low-mass merger remnants and systematically lengthens SMBH merger delays, yielding a 30–500 Myr spread in post-hardening coalescence times.
-
Lyman-alpha haloes in the aftermath of reionisation
Lyα haloes around low-luminosity LAEs at z≥6 have exponential scale lengths ~3× smaller than at z~3 under matched intrinsic surface-brightness sensitivity, with stacks of non-detections showing no extended emission at high-z.
-
Through Thick and Thin: The Cosmic Evolution of Disk Scale Height
Disk scale heights at fixed stellar mass rise from 0.56 kpc at z=3.25 to 0.84 kpc at z=1.25, then fall to 0.67 kpc at z=0.25, implying early thick-disk progenitors were dense, hot, intermediate-thickness disks.
-
The Fraction of Clumpy Galaxies in JADES Over $2<z<9$
The clumpy-galaxy fraction rises from ~20% at z>6.5 to ~80% at z~2.75 in a 9,121-galaxy JWST sample, higher than HST-based values because JWST detects fainter clumps.
-
Subaru meets JWST: A Direct Measurement of Ly$\boldsymbol{\alpha}$ Escape Fraction at $\boldsymbol{z\simeq6.2}$ with Dual Narrow-Band Imaging
Completeness-weighted stacking of 56 HAEs at z≃6.2 gives median f_esc^Lyα = 0.106^{+0.066}_{-0.044} with no strong Hα-luminosity dependence and UV-linked galaxy-to-galaxy trends.
-
Reduced Incidence of Little Red Dots at z < 3 from Number Density and Halo Mass Evolution
LRDs transition from underdense low-halo-mass environments at z>4 to typical galaxy conditions by z~3.5, with halo growth leading to larger sizes and SED changes that explain their disappearance at lower redshifts.
-
A quiescent galaxy in a gas-rich cosmic web node at z~3
A z≈3.25 massive galaxy with SFR >1 dex below the main sequence and no molecular gas is embedded in a bright, turbulent Lyα/Hα CGM, possibly quenched by a jet from a nearby AGN.
-
Introducing the Phoebos simulation: galaxy properties at the dawn of galaxy formation
A new large cosmological simulation with weak stellar feedback reproduces the stellar masses, sizes, star formation rates, and halo relations of galaxies at z roughly 8 to 12 seen by JWST.
-
DeepDive: A deep dive into the physics of the first massive quiescent galaxies in the Universe
A new sample of 150 spectroscopically confirmed quiescent galaxies at 1<z<5 shows that high-redshift examples have weaker 4000 Å breaks and reveals faint metal absorption even in the youngest subsample.
-
Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web
A 3,099-galaxy JWST sample at z~6-14 shows a bright-end UV luminosity function excess at z~9-12 relative to evolving Schechter-function predictions, with non-evolving blue UV slopes.
-
Evolution of Size, Mass, and Density of Galaxies Since Cosmic Dawn
Under the author's CCC+TL cosmology, galaxy effective radii are larger by roughly (1+z)^0.93, reducing the inferred density and mass of early galaxies.
Discussion (0). Sign in to comment.