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Article
Astronomy & Astrophysics
Hakim Atek et al.
Summary: One of the main goals of the JWST is to study the first galaxies in the Universe. Through a systematic photometric analysis, we have discovered two galaxy candidates at z similar to 16, only 250 million years after the big bang. We have also identified candidates at z similar to 12 and z similar to 9-11, demonstrating the capabilities of JWST to uncover photometric candidates at very high redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. J. Adams et al.
Summary: We conduct a search for ultra-high-redshift galaxies (z > 9) using new post-launch calibrations and identify four candidate galaxies, including one at z = 11.5 and a possible pair of galaxies. However, the recovery rate for these candidates is low, with many being assigned lower redshifts in our work. Our analysis reveals evidence of Balmer-breaks and extreme emission lines, indicating advanced or very young stellar populations depending on the cause of the excess. The resolved structures of these early galaxies show a mixture of light concentration levels, with exceptionally small sizes (<0.5 kpc).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Charlotte A. Mason et al.
Summary: Recent JWST observations suggest an excess of z ? 10 galaxy candidates above most theoretical models. The properties and number densities of galaxies observed in the early Universe are affected by the interplay between halo formation time-scales, star formation efficiency, and dust attenuation. Theoretical calculations and modeling predict that the observed galaxies at z ? 10 are dominated by those with the fastest formation time-scales, extreme star formation rates, and young ages. Deeper JWST observations are expected to reveal more typical galaxies with relatively older ages and less extreme star formation rates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. T. Donnan et al.
Summary: We analyze JWST ERO and ERS NIRCam imaging in combination with ground-based near-infrared imaging to measure the evolving galaxy UV luminosity function and estimate the UV luminosity density and cosmic star formation rate density at high redshifts. Our results confirm a double power law description of the high-redshift LF and show a gradual decline up to z≈15. We also identify 47 new high-redshift galaxy candidates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Ivo Labbe et al.
Summary: Using early release observations from the James Webb Space Telescope, we have identified six candidate massive galaxies, including one with a possible stellar mass of 10^11 solar masses, within the first 750 million years of cosmic history. These findings suggest that the stellar mass density in massive galaxies may be higher than previously anticipated.
Article
Astronomy & Astrophysics
Jorge A. Zavala et al.
Summary: Lyman-break galaxy (LBG) candidates at z greater than or similar to 10 have been identified in James Webb Space Telescope (JWST)/NIRCam observations. However, we have found that dust-enshrouded star-forming galaxies at lower redshifts may mimic the near-infrared colors of z > 10 LBGs, potentially contaminating LBG candidate samples.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Haojing Yan et al.
Summary: On July 13, 2022, NASA released the initial set of science-grade data obtained by the long-awaited James Webb Space Telescope (JWST) Early Release Observations (ERO), which marks the beginning of a new era in astronomy. The JWST allows the study of the early universe beyond the redshift boundary of z approximately 11 imposed by the Hubble Space Telescope (HST). By using JWST's NIRCam, scientists were able to identify 87 candidate objects at high redshifts, z > 11, which is unexpected and requires further investigation.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Marco Castellano et al.
Summary: In this study, we present the results of a search for galaxy candidates with redshifts around z=9-15 using deep seven-band NIRCam imaging from the GLASS-JWST Early Release Science Program. We identified several candidates using different versions of the Lyman-break technique and obtained their photometric redshifts. These candidates include two bright galaxies with redshifts greater than z=10, which is unexpected given the survey volume.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
D. Nardiello et al.
Summary: The translation discusses independent processing of JWST imaging of the metal-poor globular cluster M 92, deriving data for precision point-source photometry and astrometry. The resulting color-magnitude diagrams reveal white dwarf candidates and multiple stellar populations within M 92.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Qiao Wang et al.
Summary: This study introduces a large-scale N-body simulation, Ultramarine, which reveals the process of structure formation and evolution in the universe up to redshift 5.5. The simulation shows that the mass function of dark matter haloes agrees well with some models at high redshifts, but the halo bias factor and halo mass-concentration relation differ. Additionally, the concentration parameters of high redshift dark matter haloes are much lower than most model predictions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Steven L. Finkelstein et al.
Summary: In this study, the discovery of a candidate galaxy with a photo-z of approximately 12 in the Cosmis Evolution Early Release Science Survey was reported. The source was identified based on conservative selection criteria and has been validated through observations. The properties of this galaxy suggest that it is a young and rapidly forming galaxy.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Rohan P. Naidu et al.
Summary: Researchers have used JWST/NIRCam to search for bright galaxies in the last unexplored epoch of the universe (around a few hundred million years ago with z > 10). They have identified two candidate galaxies, which show spectral features suggesting they may have formed stars with a mass of around 10^9 solar masses in approximately 300-400 million years. These findings challenge previous predictions of the number density of such bright sources at high redshifts.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
N. J. Adams et al.
Summary: We conducted an analysis of the James Webb Space Telescope's SMACS 0723 field to search for ultra-high-redshift galaxies. We found four previously unidentified candidate galaxies, with one object at z = 11.5 and another possibly being a pair of galaxies. Most of the candidate galaxies showed evidence of color breaks and emission lines related to gas. These galaxies were exceptionally small in size and had relatively low masses. These candidates will be important targets for future observations to better understand their physical nature.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tristan L. Smith et al.
Summary: By analyzing data from ACT DR4, SPT-3G 2018, Planck polarization, and restricted Planck temperature data, we found a 3.3 sigma preference for early dark energy (EDE) over ACDM. This marks the first time that a moderate preference for EDE has been reported for these combined CMB datasets including Planck polarization.
Article
Astronomy & Astrophysics
Masato Shirasaki et al.
Summary: The study utilizes high-resolution N-body simulations to investigate halo mass functions under a ΛCDM cosmology, calibrating a four-parameter model for a wide range of masses and redshifts. The model predicts an overestimation of 20%-30% in the halo abundance at z = 6 for high masses compared to the analytical prediction by Sheth & Tormen.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Anatoly Klypin et al.
Summary: The Cold Dark Matter with cosmological constant (Lambda CDM) cosmological models with early dark energy (EDE) aim to resolve tensions between locally measured Hubble constant and deduced H-0 from Planck CMB data. Non-linear evolution reduces differences in power spectra at low redshifts but increases differences at high redshifts. EDE model predicts significantly more massive clusters at higher redshifts, potentially aiding in reionizing the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Michael Boylan-Kolchin et al.
Summary: Planck data provides precise constraints on cosmological parameters under the base Lambda CDM model, but the persistence of the 'Hubble tension' has led to interest in models like early dark energy (EDE). Research shows that EDE affects the redshift-time relation significantly and introduces uncertainty into our understanding of cosmology.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Biochemical Research Methods
Pauli Virtanen et al.
Article
Astronomy & Astrophysics
N. Aghanim et al.
ASTRONOMY & ASTROPHYSICS
(2020)
Review
Multidisciplinary Sciences
Charles R. Harris et al.
Article
Astronomy & Astrophysics
Peter Behroozi et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Sandro Tacchella et al.
ASTROPHYSICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Giulia Despali et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2016)
Article
Astronomy & Astrophysics
Charles. L. Steinhardt et al.
ASTROPHYSICAL JOURNAL
(2016)
Article
Astronomy & Astrophysics
S. G. Murray et al.
ASTRONOMY AND COMPUTING
(2013)
Article
Astronomy & Astrophysics
M. Trenti et al.
ASTROPHYSICAL JOURNAL
(2008)
Article
Computer Science, Interdisciplinary Applications
Fernando Perez et al.
COMPUTING IN SCIENCE & ENGINEERING
(2007)
Article
Astronomy & Astrophysics
D Reed et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2003)
