Search results for "Galaxy evolution"

showing 3 items of 3 documents

Testing LTB void models without the cosmic microwave background or large scale structure: new constraints from galaxy ages

2012

We present new observational constraints on inhomogenous models based on observables independent of the CMB and large-scale structure. Using Bayesian evidence we find very strong evidence for homogeneous LCDM model, thus disfavouring inhomogeneous models. Our new constraints are based on quantities independent of the growth of perturbations and rely on cosmic clocks based on atomic physics and on the local density of matter.

AstrofísicaVoid (astronomy)Cosmology and Nongalactic Astrophysics (astro-ph.CO)dark energy experimentsCosmic microwave backgroundgalaxy evolutionFOS: Physical sciencesAstrophysicsBayesian evidenceAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciences0103 physical sciencesScale structuredark energy theory010303 astronomy & astrophysicsPhysicsCOSMIC cancer databaseCosmologia010308 nuclear & particles physicsAstronomy and AstrophysicsObservableGalaxiesGalaxyGalàxiesCosmologyHomogeneousAstrophysics - Cosmology and Nongalactic Astrophysics
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Two Remarkably Luminous Galaxy Candidates at z ≈ 10-12 Revealed by JWST

2022

The first few 100 Myr at z > 10 mark the last major uncharted epoch in the history of the universe, where only a single galaxy (GN-z11 at z ≈ 11) is currently spectroscopically confirmed. Here we present a search for luminous z > 10 galaxies with JWST/NIRCam photometry spanning ≈1–5 μm and covering 49 arcmin2 from the public JWST Early Release Science programs (CEERS and GLASS). Our most secure candidates are two MUV ≈ −21 systems: GLASS-z12 and GLASS-z10. These galaxies display abrupt ≳1.8 mag breaks in their spectral energy distributions (SEDs), consistent with complete absorption of flux bluewards of Lyα that is redshifted to =+z12.40.3 0.1and=+z10.40.5 0.4. Lower redshift interlopers su…

DECOMPOSITIONII.594Early universeFOS: Physical sciences2291435PROPAGATION734595310Galaxies and CosmologyUNCERTAINTIESGalaxy evolutionGalaxy formationTO 8REIONIZATIONMASSIVE GALAXIESAstronomy and AstrophysicsBRIGHT ENDAstrophysics - Astrophysics of GalaxiesEVOLUTIONSTELLARSpace and Planetary Science5101 Astronomical SciencesAstrophysics of Galaxies (astro-ph.GA)High-redshift galaxiesJames Webb Space Telescope51 Physical Sciences
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ALHAMBRA Ks band selected catalogue

2017

Galaxy formation and evolution are an essential part of astronomy and cosmology today. To better understand the processes that are involved in the mechanism behind them it is necessary to study the physical processes in the observable universe at different epochs, which requires large astronomical surveys. In the case of the ALHAMBRA Survey, near infrared images (NIR) provide extra information that significantly increases the scientific value of the data, particularly for strongly-reddened elliptical galaxies, AGN or moderate-redshift starburst galaxies. The selection in the optical band F814W (used for ALHAMBRA’s original catalogue in Molino et al. (2014)) creates a bias against intrinsica…

redshfitcatálogobanda Ksgalaxy evolutionUNESCO::ASTRONOMÍA Y ASTROFÍSICA:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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