Results 11 to 20 of about 37,989 (204)
Observed Evidence for the Primordial Origin of Galaxy Sizes
The Astrophysical JournalWe present observational evidence supporting the scenario that the protogalactic angular momenta play an important role in molding the optical sizes of present galaxies. Analyzing the NASA-Sloan Atlas catalog in the redshift range of 0.02 ≤ z
Jun-Sung Moon, Jounghun Lee
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Magnetic helicity in primordial and dynamo scenarios of galaxies [PDF]
Astronomische Nachrichten, 2006 Some common properties of helical magnetic fields in decaying and driven turbulence are discussed. These include mainly the inverse cascade that produces fields on progressively larger scales.
Balbus +99 more
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Probing Primordial Chirality with Galaxy Spins [PDF]
Physical Review Letters, 2020 Chiral symmetry is maximally violated in weak interactions, and such microscopic asymmetries in the early Universe might leave observable imprints on astrophysical scales without violating the cosmological principle. In this Letter, we propose a helicity measurement to detect primordial chiral violation.
Hao-Ran Yu +7 more
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Primordial Supernovae and the Assembly of the First Galaxies [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractCurrent numerical studies suggest that the first protogalaxies formed a few stars at a time and were enriched only gradually by the first heavy elements. However, these models do not resolve primordial supernova (SN) explosions or the mixing of their heavy elements with ambient gas, which could result in intervening, prompt generations of low ...
Whalen, D. +3 more
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Galaxy bias and primordial non-Gaussianity [PDF]
Journal of Cosmology and Astroparticle Physics, 2015 37 pages, 2 figures; v2: minor clarifications in Section ...
Assassi, V., Baumann, D., Schmidt, F.
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A primordial feature at the scale of superclusters of galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We investigate a spatially-flat cold dark matter model (with the matter density parameter $Ω_m=0.3$) with a primordial feature in the initial power spectrum. We assume that there is a bump in the power spectrum of density fluctuations at wavelengths $λ\sim 30-60h^{-1}$Mpc, which correspond to the scale of superclusters of galaxies.
Gramann, Mirt, H\\"utsi, Gert
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Magnetic Fields in Primordial Galaxies
, 2021 Magnetic fields play a vital role in numerous astrophysical processes such as star formation and the interstellar medium. In particular, their role in the formation and evolution of galaxies is not well understood. This paper presents high-resolution magnetohydrodynamic (MHD) simulations performed with GIZMO to investigate the effect of magnetic fields
Chiu, Huai-Hsuan, Chen, Ke-Jung
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Astroparticle Constraints from Cosmic Reionization and Primordial Galaxy Formation
Universe, 2022 We derived astroparticle constraints in different dark matter scenarios that are alternatives to cold dark matter (CDM): thermal relic warm dark matter, WDM; fuzzy dark matter, ψDM; self-interacting dark matter, SIDM; sterile neutrino dark matter, νDM ...
Andrea Lapi +6 more
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Tests for primordial non-Gaussianity [PDF]
, 2000 We investigate the relative sensitivities of several tests for deviations from Gaussianity in the primordial distribution of density perturbations. We consider models for non-Gaussianity that mimic that which comes from inflation as well as that which ...
Albrecht +6 more
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Clustercentric Distance or Local Density? It Depends on Galaxy Morphology
The Astrophysical Journal, 2023 Determining which between projected local density and distance from the cluster center plays a major role in regulating morphological fractions in clusters is a longstanding debate.
Benedetta Vulcani +8 more
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