Results 211 to 220 of about 355,593 (244)

First measurement of the Weyl potential evolution from the Year 3 Dark Energy Survey data: Localising the σ8 tension

Bonvin C, Tutusaus I, Grimm N.
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Rapidly growing primordial black holes as seeds of the massive high-redshift JWST Galaxies

Science China Physics Mechanics and Astronomy, 2023
A group of massive galaxies at redshifts of z ≳ 7 have been recently detected by the James Webb Space Telescope (JWST), which were unexpected to form at such an early time within the standard Big Bang cosmology.
G. Yuan, Lei Lei, Yuanyuan Wang, Bo Wang, Yiyuan Wang, Chao Chen, Z. Shen, Y. Cai, Yi-zhong Fan   +8 more
semanticscholar   +1 more source

Supermassive Primordial Black Holes for Nano-Hertz Gravitational Waves and High-redshift JWST Galaxies

Research in Astronomy and Astrophysics
Recently, observational hints for supermassive black holes have been accumulating, prompting the question: Can primordial black holes (PBHs) be supermassive, particularly with masses M ≳ 109 M ⊙?
Hai-Long Huang, Yong Cai, Jun-Qian Jiang, Jun Zhang, Yun-Song Piao   +4 more
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A nearly primordial galaxy

Nature, 1988
[no abstract] ; © 1988 Nature Publishing Group.
openaire   +2 more sources

Scrutinizing the primordial black hole interpretation of PTA gravitational waves and JWST early galaxies

Physical Review D
Recent observations have granted to us two unique insights into the early universe: the presence of a low-frequency stochastic gravitational wave background detected by the NANOGrav and Pulsar Timing Array (PTA) experiments and the emergence of unusually
Yann Gouttenoire, S. Trifinopoulos, G. Valogiannis, Miguel Vanvlasselaer   +3 more
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Strong damped Lyman-α absorption in young star-forming galaxies at redshifts 9 to 11

Science
Primordial neutral atomic gas, mostly composed of hydrogen, is the raw material for star formation in galaxies. However, there are few direct constraints on the amount of neutral atomic hydrogen (H i) in galaxies at early cosmic times.
K. Heintz, D. Watson, G. Brammer, S. Vejlgaard, A. Hutter, V. Strait, J. Matthee, P. Oesch, P. Jakobsson, N. Tanvir, P. Laursen, R. Naidu, C. Mason, M. Killi, I. Jung, T. Hsiao, Abdurro’ Uf, Dan Coe, P. Haro, S. Finkelstein, S. Toft   +20 more
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The JWST-PRIMAL archival survey. A JWST/NIRSpec reference sample for the physical properties and Lyman-alpha absorption and emission of ~ 600 galaxies at z = 5:0 - 13:4

Astronomy & Astrophysics
One of the surprising early findings with has been the discovery of a strong ``roll-over'' or a softening of the absorption edge of in a large number of galaxies at \(z 6\), in addition to systematic offsets from photometric redshift estimates and ...
K. Heintz, G. Brammer, D. Watson, P. Oesch, L. C. Keating, M. Hayes, Abdurro’uf, K. Z. Arellano-C'ordova, A. Carnall, C. Christiansen, F. Cullen, R. Dav'e, P. Dayal, A. Ferrara, K. Finlator, J. Fynbo, S. Flury, V. Gelli, S. Gillman, R. Gottumukkala, K. Gould, T. Greve, S. Hardin, T. Hsiao, A. Hutter, P. Jakobsson, M. Killi, N. Khosravaninezhad, P. Laursen, M. Lee, G. Magdis, J. Matthee, R. Naidu, D. Narayanan, C. Pollock, M. Prescott, V. Rusakov, M. Shuntov, A. Sneppen, R. Smit, N. Tanvir, C. Terp, S. Toft, F. Valentino, A. Vijayan, J. Weaver, J. H. Wise, J. Witstok   +47 more
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Primordial Galaxies: From Local HII Galaxies to High Redshift Galaxies

1999
Primordial galaxies at early epoch may be strong Lya emitters. I review the results of recent studies of local HII galaxies on their Lya emission that are relevant to the search of distant young galaxies. The interdependance of the Lya escape with the properties of the ISM in starburst galaxies is outlined.
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Evolution of Galaxy Cluster and Primordial Nucleosynthesis

1991
The model of galaxy cluster evolution is presented, matter exchange between galaxies and intergalactic medium and time dependence of initial mass function being taken into account. In all the model versions corresponding to available observed data primordial deuterium abundance in a galaxy decreases by a factor 2 to the present time, that enables to ...
V. V. Chuvenkov, A. Yu. Glukhov, B. V. Vainer   +2 more
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Primordial Helium from Extremely Metal-Poor Galaxies

1995
Primordial helium determination relies heavily in the value obtained from extremely metal defficient galaxies (Z≤ 1/20 Z⊙) but they have been almost impossible to find. In the past few years, we have been successful in discovering them. We are now embarked in a programme for obtaining very high S/N spectra of these objects with linear detectors, in ...
Elena Terlevich, Evan D. Skillman, Roberto Terlevich   +2 more
openaire   +1 more source