Results 21 to 30 of about 216,057 (315)
Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history [PDF]
Astronomy & Astrophysics, 2019 Aims. Several kinematic and chemical substructures have been recently found amongst Milky Way halo stars with retrograde motions. It is currently unclear how these various structures are related to each other. This Letter aims to shed light on this issue.
H. Koppelman +4 more
semanticscholar +1 more source
Origin of the Excess of High-energy Retrograde Stars in the Galactic Halo [PDF]
Astrophysical Journal, 2019 We report on the very low α-element abundances of a group of metal-poor stars with high orbital energy and with large retrograde motion in the Milky Way halo, whose excess has been reported recently from metallicity and kinematics.
T. Matsuno, W. Aoki, T. Suda
semanticscholar +1 more source
Dynamical Relics of the Ancient Galactic Halo [PDF]
Astrophysical Journal, 2019 We search for dynamical substructures in the LAMOST DR3 very metal-poor (VMP) star catalog. After cross-matching with Gaia DR2, there are ∼3300 VMP stars with available high-quality astrometric information that have halo-like kinematics.
Z. Yuan +13 more
semanticscholar +1 more source
The Galactic Halo Contribution to the Dispersion Measure of Extragalactic Fast Radio Bursts [PDF]
Astrophysical Journal, 2019 A new model of the Milky Way (MW) halo component of the dispersion measure (DM) for extragalactic sources, such as fast radio bursts, is presented in light of recent diffuse X-ray observations. In addition to the spherical component of isothermal gas (kT
S. Yamasaki, T. Totani
semanticscholar +1 more source
Searching for dark matter in the Galactic halo with a wide field of view TeV gamma-ray observatory in the Southern Hemisphere [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 Despite mounting evidence that dark matter (DM) exists in the Universe, its fundamental nature remains unknown. We present sensitivity estimates to detect DM particles with a future very-high-energy (≳ TeV) wide field-of-view gamma-ray observatory in the
A. Viana +5 more
semanticscholar +1 more source
Gravitational Stability of Vortices in Bose-Einstein Condensate Dark Matter
The Open Journal of Astrophysics, 2022 We investigate a simple model for a galactic halo under the assumption that it is dominated by a dark matter component in the form of a Bose-Einstein condensate involving an ultra-light scalar particle.
Mark N Brook, Peter Coles
doaj +1 more source
Weighing the stellar constituents of the galactic halo with APOGEE red giant stars [PDF]
Monthly notices of the Royal Astronomical Society, 2019 The stellar mass in the halo of the Milky Way is notoriously difficult to determine, owing to the paucity of its stars in the solar neighbourhood. With tentative evidence from Gaia that the nearby stellar halo is dominated by a massive accretion event –
J. Mackereth, J. Bovy
semanticscholar +1 more source
The Astrophysical Journal, 2023 We studied the spectral signature of different components of the diffuse X-ray background (DXB), including Local Hot Bubble, solar wind charge exchange, galactic halo, and typically unresolved point sources (galaxies and active galactic nuclei), in the ...
Sicong Huang +6 more
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On the disc and halo of the milky way through a study of star clusters [PDF]
Serbian Astronomical Journal, 2000 The subject is the metallicity and the correlation between the metallicity and spatial distribution of star clusters of the Milky Way. The open star clusters are confirmed as good indicators for the population of the galactic disc, whereas the globular ...
Nagl M.
doaj +1 more source
Magnetic fields and UHECR propagation [PDF]
EPJ Web of Conferences, 2023 I review the main observational tools used to detect and measure magnetic fields in the interstellar medium of our Galaxy (considering both the Galactic disk and the Galactic halo), in the interstellar medium of external galaxies, and in the ...
Ferrière Katia
doaj +1 more source