EMPRESS. IX. Extremely Metal-poor Galaxies are Very Gas-rich Dispersion-dominated Systems: Will the James Webb Space Telescope Witness Gaseous Turbulent High-z Primordial Galaxies? [PDF]
The Astrophysical Journal, 2023 We present kinematics of six local extremely metal-poor galaxies (EMPGs) with low metallicities (0.016–0.098 Z _⊙ ) and low stellar masses (10 ^4.7 –10 ^7.6 M _⊙ ).
Yuki Isobe +51 more
doaj +2 more sources
High-redshift JWST Observations and Primordial Non-Gaussianity [PDF]
The Astrophysical Journal, 2023 Several bright and massive galaxy candidates at high redshifts have been recently observed by the James Webb Space Telescope. Such early massive galaxies seem difficult to reconcile with standard Λ cold dark matter model predictions.
Matteo Biagetti +2 more
doaj +2 more sources
Early Structure Formation from Primordial Density Fluctuations with a Blue, Tilted Power Spectrum: High-redshift Galaxies [PDF]
The Astrophysical Journal, 2023 Recent observations by the James Webb Space Telescope (JWST) discovered unexpectedly abundant luminous galaxies at high redshift, posing possibly a severe challenge to popular galaxy formation models.
Shingo Hirano, Naoki Yoshida
doaj +2 more sources
Entropy of the Universe and Hierarchical Dark Matter [PDF]
Entropy, 2022 We discuss the relationship between dark matter and the entropy of the universe, with the premise that dark matter exists in the form of primordial black holes (PBHs) in a hierarchy of mass tiers. The lightest tier includes all PBHs with masses below one
Paul H. Frampton
doaj +2 more sources
Primordial alignment of elliptical galaxies in intermediate redshift clusters [PDF]
, 2015 We measure primordial alignments for the red galaxies in the sample of eight massive galaxy clusters in the southern sky from the CLASH-VLT Large Programme, at a median redshift of 0.375.
Liao, Jin-Yuan +2 more
core +2 more sources
The escape of ionizing photons from supernova-dominated primordial galaxies [PDF]
, 2009 In order to assess the contribution of Lyman break galaxies (LBGs) and Lyman alpha emitters (LAEs) at redshifts 36.Comment: 8 pages, 4 figures, accepted for publication in ...
Ajiki +69 more
core +2 more sources
Primordial power spectrum in light of JWST observations of high redshift galaxies [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2023 Early data releases of JWST have revealed several high redshift massive galaxy candidates by photometry, and some of them have been confirmed spectroscopically. We study their implications on the primordial power spectrum. In the first part, we use the
Priyank Parashari, Ranjan Laha
semanticscholar +1 more source
Constraints on anisotropic primordial non-Gaussianity from intrinsic alignments of SDSS-III BOSS galaxies [PDF]
Physical Review D, 2023 We measure the three-dimensional cross-power spectrum of galaxy density and intrinsic alignment (IA) fields for the first time from the spectroscopic and imaging data of SDSS-III BOSS galaxies, for each of the four samples in the redshift range $0 ...
Toshiki Kurita, M. Takada
semanticscholar +1 more source
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension [PDF]
Astrophysical Journal, 2022 The primordial He abundance Y P is a powerful probe of cosmology. Currently, Y P is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor (
A. Matsumoto +44 more
semanticscholar +1 more source
EMPRESS. IV. Extremely Metal-poor Galaxies Including Very Low-mass Primordial Systems with M * = 104–105 M ⊙ and 2%–3% (O/H): High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-instability Supernovae [PDF]
Astrophysical Journal, 2021 We present Keck/LRIS follow-up spectroscopy for 13 photometric candidates of extremely metal-poor galaxies (EMPGs) selected by a machine-learning technique applied to the deep (∼26 AB mag) optical and wide-area (∼500 deg2) Subaru imaging data in the ...
Y. Isobe +24 more
semanticscholar +1 more source