Search Publications
The most stringent upper limit set on the mass of a central black hole in 47 Tucanae using dynamical models
Dalessandro, E.; Giunchi, E.; Cignoni, M. +3 more
Globular clusters (GCs) have been proposed as promising sites for discovering intermediate-mass black holes (IMBHs), offering the possibility to gain crucial insights into the formation and evolution of these elusive objects. The Galactic GC 47 Tucanae (also known as NGC 104) has been suggested as a potential IMBH host, yet previous studies have y…
TEMPLATES: Direct Abundance Constraints for Two Lensed Lyman-break Galaxies
Hutchison, Taylor A.; Mahler, Guillaume; Rigby, Jane R. +20 more
Using integrated spectra for two gravitationally lensed galaxies from the JWST TEMPLATES Early Release Science program, we analyze faint auroral lines, which provide direct measurements of the gas-phase chemical abundance. For the brighter galaxy, SGAS1723+34 (z = 1.3293), we detect the [O III] λ4363, [S III] λ6312, and [O II] λ λ7320, 7330 aurora…
A new kinematic model of the Galaxy: analysis of the stellar velocity field from Gaia Data Release 3
Lattanzi, M. G.; Re Fiorentin, P.; Bucciarelli, B. +4 more
This work presents the results of a kinematic analysis of the Galaxy that uses a new model as applied to the newest available Gaia data. We carry out the Taylor decomposition of the velocity field up to second order for 18 million high luminosity stars (i.e. OBAF-type stars, giants, and subgiants) from the Gaia DR3 data. We determine the component…
Ultraviolet and Chromospheric Activity and Habitability of M Stars
Huang, Yang; Liu, Jifeng; Wang, Song +4 more
M-type stars are crucial for stellar activity studies because they cover two types of magnetic dynamos and are particularly intriguing for habitability studies due to their abundance and long lifespans during the main-sequence stage. In this paper, we used the LAMOST DR9 catalog and the GALEX UV archive data to investigate the chromospheric and UV…
TOI-5005 b: A super-Neptune in the savanna near the ridge
Bouchy, F.; Winn, J. N.; Moya, A. +38 more
Context. The Neptunian desert and savanna have recently been found to be separated by a ridge, an overdensity of planets in the period range of ≃3–5 days. These features are thought to be shaped by dynamical and atmospheric processes. However, their roles are not yet well understood. Aims. Our aim was to confirm and characterize the super-Neptune …
Determining Cosmological-model-independent H 0 with Gravitationally Lensed Supernova Refsdal
Li, Xiaolei; Liao, Kai
The reappearance of supernova Refsdal with detailed modeling of the lens cluster allows us to measure the time-delay distance, which serves as a powerful tool to determine the Hubble constant (H 0). We give a cosmological-model-independent method to estimate H 0 through Gaussian process regression, using time-delay measuremen…
Stellar Models are Reliable at Low Metallicity: An Asteroseismic Age for the Ancient Very Metal-poor Star KIC 8144907
Li, Yaguang; Huber, Daniel; Ong, J. M. Joel +15 more
Very-metal-poor stars ([Fe/H] < ‑2) are important laboratories for testing stellar models and reconstructing the formation history of our galaxy. Asteroseismology is a powerful tool to probe stellar interiors and measure ages, but few asteroseismic detections are known in very-metal-poor stars and none have allowed detailed modeling of oscillat…
A3COSMOS: Measuring the cosmic dust-attenuated star formation rate density at 4 < z < 5
Daddi, Emanuele; Schinnerer, Eva; Oesch, Pascal +14 more
Context. In recent years, conflicting results have provided an uncertain view of the dust-attenuated star-forming properties of z ≳ 4 galaxies.
Aims: To solve this, we need to accurately measure the mean dust-attenuated properties of star-forming galaxies (SFGs) at 4 < z < 5 and therefore constrain the cosmic dust-attenuated star format…
The S-PLUS Fornax Project (S+FP): A first 12-band glimpse of the Fornax galaxy cluster
Demarco, R.; Mendes de Oliveira, C.; Lopes, P. A. A. +40 more
The Fornax galaxy cluster is the richest nearby (D ~ 20 Mpc) galaxy association in the southern sky. As such, it provides a wealth of opportunities to elucidate on the processes where environment holds a key role in transforming galaxies. Although it has been the focus of many studies, Fornax has never been explored with contiguous homogeneous wid…
When, where, and how star formation happens in a galaxy pair at cosmic noon using CANUCS JWST/NIRISS grism spectroscopy
Willott, Chris J.; Martis, Nicholas S.; Bradač, Maruša +13 more
Spatially resolved studies are key to understanding when, where, and how stars form within galaxies. Using slitless grism spectra and broad-band imaging from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS), we study the spatially resolved properties of a strongly lensed (µ = 5.4$\pm$1.8) z = 0.8718 galaxy pair consisting of a blue face-…