Search Publications
The FLAMINGO simulation view of cluster progenitors observed in the epoch of reionization with JWST
Maiolino, Roberto; Tacchella, Sandro; Helton, Jakob M. +4 more
Motivated by the recent JWST discovery of galaxy overdensities during the Epoch of Reionzation, we examine the physical properties of high-z protoclusters and their evolution using the Full-hydro Large-scale structure simulations with All-sky Mapping for the Interpretation of Next Generation Observations (FLAMINGO) simulation suite. We investigate…
Galaxy mergers in UNIONS - I. A simulation-driven hybrid deep learning ensemble for pure galaxy merger classification
Ellison, Sara L.; Gwyn, Stephen D. J.; Ferreira, Leonardo +7 more
Merging and interactions can radically transform galaxies. However, identifying these events based solely on structure is challenging as the status of observed mergers is not easily accessible. Fortunately, cosmological simulations are now able to produce more realistic galaxy morphologies, allowing us to directly trace galaxy transformation throu…
Enhanced star formation and metallicity deficit in the USS 1558-003 forming protocluster at z = 2.53
Tanaka, I.; Daikuhara, K.; Koyama, Y. +6 more
We use K-band multi-object near-infrared spectroscopy with Keck/MOSFIRE to search for environmental imprints on the gas properties of 27 narrow-band selected H α emitters (HAEs) across the three major clumps of the assembling USS1558-003 protocluster at z = 2.53. We target the H α and [N II]λ6584 emission lines to obtain star formation rates (SFR)…
Adding value to JWST spectra and photometry: stellar population and star formation properties of spectroscopically confirmed JADES and CEERS galaxies at z > 7
Conselice, Christopher J.; Li, Qiong; Adams, Nathan +5 more
In this paper, we discuss measurements of the stellar population and star-forming properties for 43 spectroscopically confirmed publicly available high-redshift z > 7 JWST galaxies in the JADES and CEERS observational programs. We carry out a thorough study investigating the relationship between spectroscopic features and photometrically derive…
Strong outflows and inefficient star formation in the reionization-era ultrafaint dwarf galaxy Eridanus II
Weisz, Daniel R.; Weinberg, David H.; Fu, Sal Wanying +1 more
We present novel constraints on the underlying galaxy formation physics (e.g. mass-loading factor, star formation history, and metal retention) at z ≳ 7 for the low-mass (M* ~ 105 M⊙) Local Group ultrafaint dwarf galaxy (UFD) Eridanus II (Eri II). Using a hierarchical Bayesian framework, we apply a one-zone chemica…
EPOCHS IX. When cosmic dawn breaks: evidence for evolved stellar populations in 7 < z < 12 galaxies from PEARLS GTO and public NIRCam imaging
Grogin, Norman A.; Pirzkal, Nor; Wilkins, Stephen M. +28 more
The presence of evolved stars in high-redshift galaxies can place valuable indirect constraints on the onset of star formation in the Universe. Thus, we use PEARLS GTO (Prime Extragalactic Areas for Reionization and Lensing Science Guaranteed Time Observations) and public NIRCam (Near Infrared Camera) photometric data to search for Balmer-break ca…
First asteroseismic analysis of the globular cluster M80: multiple populations and stellar mass-loss
Stello, Dennis; De Silva, Gayandhi M.; Howell, Madeline +1 more
Asteroseismology provides a new avenue for accurately measuring the masses of evolved globular cluster (GC) stars. We present the first detections of solar-like oscillations in 47 red giant branch (RGB) and early asymptotic giant branch (EAGB) stars in the metal-poor GC M80; only the second with measured seismic masses. We investigate two areas of…
ω Centauri: a MUSE discovery of a counter-rotating core
Pechetti, Renuka; Weilbacher, Peter M.; Krajnović, Davor +7 more
ω Centauri is considered the most massive globular cluster of the Milky Way and likely the former nuclear star cluster of a Galaxy accreted by the Milky Way. It is speculated to contain an intermediate-mass black hole (IMBH) from several dynamical models. However, uncertainties regarding the location of the cluster centre or the retention of stell…
Probing the Galactic halo with RR Lyrae stars - V. Chemistry, kinematics, and dynamically tagged groups
Liu, Gaochao; Huang, Yang; Beers, Timothy C. +9 more
We employ a sample of 135 873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated P-ϕ31-R21-[Fe/H] and Gaia G band P-R21-[Fe/H] absolute magnitude-metallicity relations of Li et al., combined with available proper motions from Gaia EDR3, and 6955 systemic radi…
CSST WL preparation I: forecast the impact from non-Gaussian covariances and requirements on systematics control
Hu, Bin; Li, Nan; Fan, Zuhui +11 more
The precise estimation of the statistical errors and accurate removal of the systematical errors are the two major challenges for the stage IV cosmic shear surveys. We explore their impact for the China Space Station Telescope (CSST) with survey area ${\sim} 17\,500\deg ^2$ up to redshift ~4. We consider statistical error contributed from Gaussian…