Results 71 to 80 of about 2,129 (213)
The Circular Velocity Curve of the Milky Way from 5–25 kpc Using Luminous Red Giant Branch Stars
The Astrophysical Journal, 2023 We present a sample of 254,882 luminous red giant branch (LRGB) stars selected from the APOGEE and LAMOST surveys. By combining photometric and astrometric information from the Two Micron All Sky Survey and Gaia survey, the precise distances of the ...
Yuan Zhou +3 more
doaj +1 more source
Testing Noncommutativity-Like Model as a Galactic Density Profile
Galaxies, 2021 Noncommutative-like model (NC-like) is an interesting alternative inspired by string theory to understand and describe the velocity rotation curves of galaxies without the inclusion of dark matter particles.
Juan Jordi Ancona-Flores +2 more
doaj +1 more source
Revisiting Variable Stars Toward the Globular Cluster NGC 6496 With ATLAS and Gaia Photometry
Astronomische Nachrichten, EarlyView.ABSTRACT We revisit 13 variable stars in the field of the metal‐rich globular cluster NGC 6496, discovered by Abbas et al. (2015; Astronomical Journal 149:40) (hereafter referred to as “MA15”) via time‐series data, spanning 2 years. We improve upon the MA15 characterization of the variables using ATLAS time‐series photometry data, spanning 8 years, in ...
Madison E. Martin +2 more
wiley +1 more source
The Supersonic Project: The Eccentricity and Rotational Support of SIGOs and DM GHOSts
The Astrophysical Journal, 2023 A supersonic relative velocity between dark matter (DM) and baryons (the stream velocity) at the time of recombination induces the formation of low-mass objects with anomalous properties in the early universe.
Claire E. Williams +9 more
doaj +1 more source
A Data Driven Solution to the Dark Matter Problem
ACI Avances en Ciencias e Ingenierías, 2023 A data driven solution to the dark matter problem is presented. This short and self-contained overview is intended for a wide audience, with full technical details available in the cited references.
Bruce Hoeneisen
doaj +1 more source
Investigation on tunnel stability considering pipe‐roof support with transparent soil technology
Deep Underground Science and Engineering, EarlyView.This study integrates transparent soil technology, 3D reconstruction and numerical simulation to captures the full‐field deformation of shield tunnel instability. Results demonstrate that pipe‐roof support enhances stability via the “soil‐arching barrier effect,” effectively restraining failure wedge development by extending stress transfer paths ...
Zhi Jia +4 more
wiley +1 more source
Breaking the Degeneracy between Warps and Radial Flows in External Galaxies
The Astrophysical JournalObservations of the line-of-sight (LOS) component of emitter velocities in galaxies are valuable for reconstructing their two-dimensional (2D) velocity fields, albeit requiring certain assumptions.
Francesco Sylos Labini +2 more
doaj +1 more source
International Journal of Chemical Kinetics, EarlyView.ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley +1 more source
Galaxy rotation curves from general relativity with renormalization group corrections [PDF]
, 2015 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We consider the application of quantum corrections computed using renormalization group arguments in the astrophysical domain
Rodrigues, DC, Letelier, PS, Shapiro, IL
core +1 more source
Galaxy Size and Rotation Curve Diversity in ΛCDM with Baryons
The Astrophysical JournalThe observed rotation curves of dwarf galaxies exhibit significant diversity at fixed halo mass, challenging galaxy formation within the cold dark matter (CDM) model.
Akaxia Cruz +9 more
doaj +1 more source