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相关论文: Simulating JWST deep extragalactic imaging surveys…

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A substantial number of ultra-high redshift (8 < z < 17) galaxy candidates have been detected with JWST, posing the question: are these observational results surprising in the context of current galaxy formation models? We address this…

Early photometric results from JWST have revealed a number of galaxy candidates above redshift 10. The initial estimates of inferred stellar masses and the associated cosmic star formation rates are above most theoretical model predictions…

星系天体物理 · 物理学 2023-09-04 Corey Brummel-Smith , Danielle Skinner , Snigdaa S. Sethuram , John H. Wise , Bin Xia , Khushi Taori

The field of high redshift galaxy formation has been revolutionised by JWST, which is yielding unprecedented insights on galaxy assembly at early times. Our key aim is to study the physical mechanisms that can explain the unexpected…

星系天体物理 · 物理学 2025-04-23 Valentin Mauerhofer , Pratika Dayal , Martin G. Haehnelt , Taysun Kimm , Joakim Rosdahl , Romain Teyssier

We present new lensing frequency estimates for existing and forthcoming deep near-infrared surveys, including those from JWST and VISTA. The estimates are based on the JAdes extraGalactic Ultradeep Artificial Realisations (JAGUAR) galaxy…

星系天体物理 · 物理学 2023-08-16 Philip Holloway , Aprajita Verma , Philip J. Marshall , Anupreeta More , Matthias Tecza

We analyse the photometric and spectroscopic properties of four galaxies in the epoch of reionisation (EoR) within the SMACS 0723 JWST Early Release Observations field. Given the known spectroscopic redshifts of these sources, we…

The James Webb Space Telescope (JWST) is unveiling astounding results about the first few hundred million years of life of the Universe, delivering images of galaxies at very high redshifts. Here, we develop a UV luminosity function model…

宇宙学与河外天体物理 · 物理学 2024-09-17 Fabio Iocco , Luca Visinelli

Using the most recent measurements of the ultraviolet (UV) luminosity functions (LFs) and dust estimates of early galaxies, we derive updated dust-corrected star-formation rate functions (SFRFs) at z~4-8, which we model to predict the…

星系天体物理 · 物理学 2015-10-22 Natalie Mashian , Pascal Oesch , Abraham Loeb

JWST's discovery of unexpectedly bright $z>10$ galaxies has triggered claims that standard $\Lambda$CDM cannot reproduce their abundances, while estimates of the ionizing escape fraction $f_{\rm esc}$ at $z>6$ have spanned a factor of four…

宇宙学与河外天体物理 · 物理学 2026-05-06 Zihan Wang , Huanyuan Shan

Early observations with JWST have led to the discovery of an unexpected large density (stellar mass density $\rho_*\approx 10^{6}\,M_{\odot}\,Mpc^{-3}$) of massive galaxies (stellar masses $M_*\geq 10^{10.5}M_{\odot}$) at extremely high…

宇宙学与河外天体物理 · 物理学 2022-10-26 N. Menci , M. Castellano , P. Santini , E. Merlin , A. Fontana , F. Shankar

Observations with the {\it James Webb Space Telescope} have revealed a high abundance of bright galaxies at redshift, $z\gtrsim 12$, which has been widely interpreted as conflicting with the $\Lambda$CDM model. In Cowley et al. (2018)…

星系天体物理 · 物理学 2024-11-27 Shengdong Lu , Carlos S. Frenk , Sownak Bose , Cedric G. Lacey , Shaun Cole , Carlton M. Baugh , John C. Helly

A wealth of extragalactic populations completely missed at UV-optical wavelengths has been identified in the last decade, combining the deepest HST and Spitzer observations. These dark sources are thought to be very dusty and star-forming…

We analyze a sample of 3300 galaxies between redshifts z~3.5 and z~8.5 selected from JWST images in the Hubble Ultra Deep Field (HUDF) and UKIDSS Ultra Deep Survey field, including objects with stellar masses as low as ~ 10^8 Msun up to…

The James Webb Space Telescope (JWST) has unveiled unexpectedly massive galaxy candidates at high redshifts, challenging standard $\Lambda$CDM cosmological predictions. In this work, we study the predictions of more realistic dark matter…

星系天体物理 · 物理学 2026-03-17 Saeed Fakhry , Reyhaneh Vojoudi Salmani , Javad T. Firouzjaee

We present and compare in this paper new photometric redshift catalogs of the galaxies in three public fields: the NTT Deep Field, the HDF-N and the HDF-S. Photometric redshifts have been obtained for thewhole sample, by adopting a $\chi^2$…

天体物理学 · 物理学 2009-10-31 A. Fontana , S. D'Odorico , F. Poli , E. Giallongo , S. Arnouts , S. Cristiani , A. Moorwood , P. Saracco

The James Webb Space Telescope (JWST) has enabled us to uncover faint galaxies and active galactic nuclei (AGNs) in the early universe. Taking advantage of the unique filter combination used in the Cosmic Evolution Early Release Science…