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Optical emission-line ratios are traditionally used to estimate gas metallicities from observed galaxy spectra. While such estimators have been calibrated primarily at low redshift, they are commonly used to study high-redshift galaxies,…

星系天体物理 · 物理学 2023-05-09 Michaela Hirschmann , Stephane Charlot , Rachel S. Somerville

A combination of ground-based (NTT and VLT) and HST (HDF-N and HDF-S) public imaging surveys have been used to collect a sample of 1712 I-selected and 319 $K\leq 21$ galaxies. Photometric redshifts have been obtained for all these galaxies.…

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

The James Webb Space Telescope (JWST), scheduled for launch in 2014, is expected to revolutionize our understanding of the high-redshift Universe. Even so, many of the most interesting sources that may be hiding at redshifts z~10…

宇宙学与河外天体物理 · 物理学 2015-03-17 E. Zackrisson

Resolved stellar morphology of $z>1$ galaxies was inaccessible before JWST. This limitation, due to the impact of dust on rest-frame UV light, had withheld major observational conclusions required to understand the importance of clumps in…

星系天体物理 · 物理学 2025-01-30 Boris S. Kalita , John D. Silverman , Emanuele Daddi , Wilfried Mercier , Luis C. Ho , Xuheng Ding

Early results from the James Webb Space Telescope (JWST) observations have hinted at two traces beyond the standard cosmological framework. One is the extraordinarily high stellar masses and their density at $z=7.5\sim9.1$, another is the…

星系天体物理 · 物理学 2023-09-13 Yi-Ying Wang , Lei Lei , Guan-Wen Yuan , Yi-Zhong Fan

We propose a novel use of high-redshift galaxies, discovered in deep Hubble Space Telescope (HST) fields around strong lensing clusters. These fields probe small comoving volumes (about 1000 cubic Mpc) at high magnification ({\mu} > 10),…

宇宙学与河外天体物理 · 物理学 2013-08-15 Fabio Pacucci , Andrei Mesinger , Zoltan Haiman

The upcoming launch of the James Webb Space Telescope (JWST) will dramatically increase our understanding of exoplanets, particularly through direct imaging. Microlensing and radial velocity surveys indicate that some M-dwarfs host long…

地球与行星天体物理 · 物理学 2020-01-08 Jonathan Brande , Thomas Barclay , Joshua E. Schlieder , Eric D. Lopez , Elisa V. Quintana

We combine the galaxy formation model GALFORM with the Photon Dominated Region code UCL_PDR to study the emission from the rotational transitions of 12CO (CO) in galaxies from z=0 to z=6 in the Lambda CDM framework. GALFORM is used to…

宇宙学与河外天体物理 · 物理学 2015-06-04 Claudia del P. Lagos , Estelle Bayet , Carlton M. Baugh , Cedric G. Lacey , Tom Bell , Nikolaos Fanidakis , James Geach

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

Galaxy redshift surveys are designed to map cosmic structures in three dimensions for large-scale structure studies. Nevertheless, limitations due to sampling and the survey window are unavoidable and degrade the cosmological constraints.…

宇宙学与河外天体物理 · 物理学 2022-04-01 N. Estrada , B. R. Granett , L. Guzzo

Galaxy clustering measurements can be used to constrain many aspects of galaxy evolution, including galaxy host halo masses, satellite quenching efficiencies, and merger rates. We simulate JWST galaxy clustering measurements at…

We present the first results of the JWST Emission Line Survey (JELS). Utilising the first NIRCam narrow-band imaging at 4.7$\mu$m, over 63 arcmin$^{2}$ in the PRIMER/COSMOS field, we identified 609 emission line galaxy candidates. From…

We reduce and analyse the available James Webb Space Telescope (JWST) ERO and ERS NIRCam imaging (SMACS0723, GLASS, CEERS) in combination with the latest deep ground-based near-infrared imaging in the COSMOS field (provided by UltraVISTA…

JWST observations have revealed an overabundance of bright galaxies at $z \geq 9$, creating apparent tensions with theoretical predictions within standard $\Lambda$CDM cosmology. We address this challenge using a semi-empirical approach…

星系天体物理 · 物理学 2025-11-13 Abhijnan Kar , Shadab Alam , Joseph Silk

Wide-field slitless spectroscopic galaxy surveys, such as the one performed by the upcoming Chinese Space Station Survey Telescope (CSST), are crucial for precision cosmology but present formidable data analysis challenges. Because spectra…

天体物理仪器与方法 · 物理学 2026-05-19 Xingchen Zhou , Yan Gong , Xin Zhang , Xian-Min Meng , Haitao Miao , Run Wen , Nan Li

We present a catalog of about 25,000 images of massive ($M_{\star} \ge 10^9 M_{\odot}$) galaxies at redshift $3 \leq z \leq 6$ from the TNG50 cosmological simulation, tailored for observations at multiple wavelengths carried out with JWST.…

Aerosols are capable of having a huge influence on reflected, emitted and transmitted planetary spectra. The Near InfraRed Spectrograph (NIRSpec) using the PRISM mode on board of the James Webb Space Telescope (JWST) is providing valuable…

地球与行星天体物理 · 物理学 2025-02-19 J. Roy-Perez , S. Pérez-Hoyos , N. Barrado-Izagirre , H. Chen-Chen

In the current era of JWST, we continue to uncover a wealth of information about the Universe deep into the Epoch of Reionization. In this work, we use a suite of simulations with 21cmSPACE, to explore the astrophysical properties of early…

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