Results 81 to 90 of about 14,841,931 (226)

CHILES. XI. Resolved H I Morphologies and the Evolution of the H2/H I Ratio over the Last Five Billion Years

open access: yesThe Astrophysical Journal
We present the neutral gas morphology of four galaxies from z = 0.22 to 0.47 obtained with the COSMOS H i Large Extragalactic Survey (CHILES). The H i is resolved at the highest redshift with the 7 $\mathop{.}\limits^{\unicode{x02033}}$ 5 beam of CHILES ...
J. Blue Bird   +10 more
doaj   +1 more source

CEERS Key Paper. III. The Diversity of Galaxy Structure and Morphology at z = 3–9 with JWST

open access: yesThe Astrophysical Journal Letters, 2023
We present a comprehensive analysis of the evolution of the morphological and structural properties of a large sample of galaxies at z = 3–9 using early James Webb Space Telescope (JWST) CEERS NIRCam observations. Our sample consists of 850 galaxies at z
Jeyhan S. Kartaltepe   +61 more
doaj   +1 more source

Dynamical Dark Sector: A Joint Two‐Scalar‐Field Model for Dark Matter and Quintessence

open access: yesAdvances in Astronomy, Volume 2026, Issue 1, 2026.
The physical nature of dark matter and dark energy remains one of the most pressing questions in modern cosmology. This work presents a phenomenological model where the entire dark sector is described by two minimally coupled scalar fields within general relativity.
Silvio A. Corrêa Junior, Jianguo Yan
wiley   +1 more source

THE PREMATURE FORMATION OF HIGH-REDSHIFT GALAXIES [PDF]

open access: yesThe Astronomical Journal, 2014
Accepted for publication in the Astronomical ...
openaire   +2 more sources

The nature of high-redshift galaxies [PDF]

open access: yesPhysics Reports, 1998
Abstract Using semi-analytic models of galaxy formation, we investigate the properties of z∼3 galaxies and compare them with the observed population of Lyman-break galaxies (LBGs). In addition to the usual quiescent mode of star formation, we introduce a physical model for starbursts triggered by galaxy–galaxy interactions.
Joel R. Primack   +3 more
openaire   +1 more source

Galaxy clustering and dynamics from redshift surveys [PDF]

open access: yes, 1990
The clustering and dynamical properties of the 368 galaxies in the redshift surveys of Metcalfe et al. (1989) and Parker et al. (1986) are investigated. These galaxies were selected from ten high galactic latitude fields complete to a magnitude limit of ...
Hale-Sutton, D, Hale-Sutton, Duncan
core  

AN H I SURVEY OF SIX LOCAL GROUP ANALOGS. II. H I PROPERTIES OF GROUP GALAXIES [PDF]

open access: yes, 2008
The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz, In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-
Uchiyama Y   +999 more
core   +8 more sources

The AURORA Survey: High-redshift Empirical Metallicity Calibrations from Electron Temperature Measurements at z = 2–10

open access: yesThe Astrophysical Journal
We present detections of auroral emission lines of [O iii ], [O ii ], [S iii ], and [S ii ] in deep JWST/NIRSpec spectroscopy for 41 star-forming galaxies at z  = 1.4–7.2 from the AURORA survey.
Ryan L. Sanders   +31 more
doaj   +1 more source

The Effect of Seductive Details on Knowledge Retention in Physics Videos: A Mixed Methods Study

open access: yesJournal of Research in Science Teaching, Volume 62, Issue 8, Page 1923-1940, October 2025.
ABSTRACT Research reports that interesting but irrelevant information, seductive details, in teaching material can impede learning. In science education, the inclusion of historical narratives in lessons to promote interest has been recommended but may hinder learning.
Richard Brock   +2 more
wiley   +1 more source

The Clustering of Dark Matter, Haloes & Galaxies [PDF]

open access: yes, 2008
In this thesis I study the spatial distribution of galaxies, haloes and dark matter particlesin the Universe. The subjects investigated are conceptually divided into three areas.One line of research, which is made up of Chapters 2 and 3, is to explore ...
Raúl Esteban Angulo de la Puente,
core  

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