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The star formation history of the Sco-Cen association. Coherent star formation patterns in space and time
Meingast, Stefan; Alves, João; Rottensteiner, Alena +13 more
We reconstructed the star formation history of the Sco-Cen OB association using a novel high-resolution age map of the region. We developed an approach to produce robust ages for Sco-Cen's recently identified 37 stellar clusters using the SigMA algorithm. The Sco-Cen star formation timeline reveals four periods of enhanced star formation activity,…
Alleviating the Need for Exponential Evolution of JWST Galaxies in 1010 M ⊙ Haloes at z > 10 by a Modified ΛCDM Power Spectrum
Loeb, Abraham; Padmanabhan, Hamsa
We infer the evolution of the UV luminosities of galaxies in haloes of masses 1010-1011 M ⊙ in the redshift range of z ~ 9-16 from the recent JWST data. Within the standard ΛCDM cosmological model, it is found that the average luminosities in this halo mass range show an exponential evolution with redshift, in exce…
High-redshift JWST Observations and Primordial Non-Gaussianity
Biagetti, Matteo; Franciolini, Gabriele; Riotto, Antonio
Several bright and massive galaxy candidates at high redshifts have been recently observed by the James Webb Space Telescope. Such early massive galaxies seem difficult to reconcile with standard Λ cold dark matter model predictions. We discuss under which circumstances such observed massive galaxy candidates can be explained by introducing primor…
CEERS Key Paper. II. A First Look at the Resolved Host Properties of AGN at 3 < z < 5 with JWST
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +57 more
We report on the host properties of five X-ray-luminous active galactic nuclei (AGN) identified at 3 < z < 5 in the first epoch of imaging from the Cosmic Evolution Early Release Science Survey. Each galaxy has been imaged with the JWST Near-Infrared Camera, which provides rest-frame optical morphologies at these redshifts. We also derive st…
Early Results from GLASS-JWST. XVI. Discovering a Bluer z 4-7 Universe through UV Slopes
Santini, Paola; Calabrò, Antonello; Castellano, Marco +20 more
We use the GLASS-JWST Early Release Science NIRCam parallel observations to provide a first view of the UV continuum properties of NIRCam/F444W selected galaxies at 4 < z < 7. By combining multiwavelength NIRCam observations, we constrain the UV continuum slope for a sample of 401 galaxies with stringent quality controls. We find that >99…
AF Lep b: The lowest-mass planet detected by coupling astrometric and direct imaging data
Kervella, P.; D'Orazi, V.; Zurlo, A. +6 more
Aims: Using the direct-imaging technique, we searched for low-mass companions around the star AF Lep, which presents a significant proper-motion anomaly (PMa) signal obtained from the comparison of HIPPARCOS and Gaia eDR3 catalogs.
Methods: We observed AF Lep in two epochs with VLT/SPHERE using its subsystems IFS and IRDIS in the near-in…
An assessment of the association between a fast radio burst and binary neutron star merger
Zhang, Bing; Moroianu, Alexandra; Wen, Linqing +4 more
Fast radio bursts (FRBs) are bright millisecond-duration radio bursts at cosmological distances. While young magnetars are the leading source candidate, recent observations suggest that there may be multiple FRB progenitor classes. Here we investigate a potential coincidence between a binary neutron star merger event, GW190425, and a bright, non-r…
The Circular Velocity Curve of the Milky Way from 5-25 kpc Using Luminous Red Giant Branch Stars
Huang, Yang; Zhang, Huawei; Li, Xinyi +1 more
We present a sample of 254,882 luminous red giant branch (LRGB) stars selected from the APOGEE and LAMOST surveys. By combining photometric and astrometric information from the Two Micron All Sky Survey and Gaia survey, the precise distances of the sample stars are determined by a supervised machine-learning algorithm: the gradient-boosted decisio…
Triage of the Gaia DR3 astrometric orbits - I. A sample of binaries with probable compact companions
Mazeh, T.; Arenou, F.; Faigler, S. +4 more
In preparation for the release of the astrometric orbits of Gaia, Shahaf et al. (2019) proposed a triage technique to identify astrometric binaries with compact companions based on their astrometric semimajor axis, parallax, and primary mass. The technique requires the knowledge of the appropriate mass-luminosity relation to rule out single or clo…
Seeing sharper and deeper: JWST's first glimpse of the photometric and spectroscopic properties of galaxies in the epoch of reionization
Wilkins, Stephen M.; Frye, Brenda L.; Conselice, Christopher J. +12 more
We analyse the photometric and spectroscopic properties of four galaxies in the epoch of reionization (EoR) within the SMACS J0723.3-7327 JWST Early Release Observations field. Given the known spectroscopic redshifts of these sources, we investigated the accuracy with which photometric redshifts can be derived using NIRCam photometry alone, findin…