Results 51 to 60 of about 355,593 (244)
The Astrophysical Journal, 2023 About 12 billion years ago, the Universe was first experiencing light again after the dark ages, and galaxies filled the environment with stars, metals, and dust. How efficient was this process? How fast did these primordial galaxies form stars and dust?
Meriem Behiri +14 more
doaj +1 more source
Contributions to the Power Spectrum of Cosmic Microwave Background from Fluctuations Caused by Clusters of Galaxies [PDF]
, 2000 We estimate the contributions to the cosmic microwave background radiation (CMBR) power spectrum from the static and kinematic Sunyaev-Zel'dovich (SZ) effects, and from the moving cluster of galaxies (MCG) effect.
Aghanim N. +16 more
core +3 more sources
The PHLEK Survey: A New Determination of the Primordial Helium Abundance [PDF]
Astrophysical Journal, 2020 We present Keck NIRSPEC and Keck NIRES spectroscopy of sixteen metal-poor galaxies that have pre-existing optical observations. The near-infrared (NIR) spectroscopy specifically targets the He i λ10830 Å emission line, due to its sensitivity to the ...
Tiffany Hsyu +3 more
semanticscholar +1 more source
Constraining Primordial Black Holes with Dwarf Galaxy Heating [PDF]
The Astrophysical Journal Letters, 2021 Abstract Black holes formed in the early universe, prior to the formation of stars, can exist as dark matter and also contribute to the black hole merger events observed in gravitational waves. We set a new limit on the abundance of primordial black holes (PBHs) by considering interactions of PBHs with the interstellar medium, which ...
Philip Lu +5 more
openaire +2 more sources
On the Formation and Interaction of Multiple Supermassive Stars in Cosmological Flows
The Astrophysical Journal, 2023 Supermassive primordial stars with masses exceeding ∼10 ^5 M _⊙ that form in atomically cooled halos are the leading candidates for the origin of high-redshift quasars at z > 6.
Tyrone E. Woods +3 more
doaj +1 more source
Imprint of galactic rotation curves and metric fluctuations on the recombination era anisotropy
Physics Letters B, 2023 In applications of the conformal gravity theory it has been shown that a scale of order 105 Mpc due to large scale inhomogeneities such as clusters of galaxies is imprinted on the rotation curves of galaxies.
Philip D. Mannheim
doaj +1 more source
Strong Primordial Inhomogeneities and Galaxy Formation [PDF]
, 2004 The modern theory of the cosmological large-scale structure is based on the assumption that this structure is formed as the result of development of gravitational instability from small initial perturbations of density or gravitational potential. As a rule, these perturbations are Gaussian, but some versions of non-Gaussian perturbations are also ...
Maxim Yu. Khlopov, Sergei G. Rubin
openaire +1 more source
Isolated galaxies: residual of primordial building blocks? [PDF]
Astronomy & Astrophysics, 2006 CONTEXT.The mass assembly is believed to be the dominant process of early galaxy formation. This mechanism of galaxy building can proceed either by repeated major mergers with other systems, or by means of accretion of matter from the surrounding regions. AIMS.In this paper we compare the properties of local disk galaxies that appear isolated, i.e. not
GALLETTA, GIUSEPPE +4 more
openaire +3 more sources
Gas accretion as the origin of chemical abundance gradients in distant galaxies
, 2010 It has recently been suggested that galaxies in the early Universe can grow through the accretion of cold gas, and that this may have been the main driver of star formation and stellar mass growth. Because the cold gas is essentially primordial, it has a
A Dekel +34 more
core +1 more source
Probing primordial features with future galaxy surveys [PDF]
Journal of Cosmology and Astroparticle Physics, 2016 24 pages, 11 figures, version matching JCAP publication, figures ...
BALLARDINI, MARIO +3 more
openaire +5 more sources