Results 41 to 50 of about 73,795 (320)
Is the galactic halo baryonic?
, 1995 Recent observations of microlensing events in the Large Magellanic Cloud suggest that a sizeable fraction of the galactic halo is in form of MACHOs with mass less than abou 0.1 M_{\odot}. Here we argue that molecular clouds (mainly H_2) located in the galactic halo can contribute substantially to its total mass.
DE PAOLIS, Francesco +3 more
openaire +3 more sources
On the early evolution of the Galactic halo [PDF]
Astronomy & Astrophysics, 2003 It is shown that the low metallicity tail of the stellar metallicity distribution predicted by simple Outflow models for the Milky Way halo depends sensitively on whether Instantaneous Recycling is adopted or relaxed. In both cases, current - and still preliminary - data suggest a ``G-dwarf problem'' for the halo (reminiscent of the local disk).
openaire +3 more sources
Sub-structures in the inner halo of the Milky Way
EPJ Web of Conferences, 2012 We present a spectroscopic study of a sample of 238 RR Lyrae stars, from the QUEST survey, located in the Galactic halo at distances between 4 and 20 kpc from the Sun.
Duffau S. +3 more
doaj +1 more source
Traversable wormholes supported by dark matter and monopoles with semiclassical effects
European Physical Journal C: Particles and Fields, 2023 We present a new traversable wormhole explication of Einstein’s field equations supported by the profile of Einasto Dark Matter densities (Einasto in Trudy Inst Astrofiz Alma-Ata 51:87, 1965; PTarO 36:414, 1968; Astron Nachr 291:97, 1969) and global ...
Farook Rahaman +4 more
doaj +1 more source
The Settling of Warped Disks in Oblate Dark Halos [PDF]
Astrophys.J. 442 (1995) 492, 1994 When a galaxy forms, the disk may initially be tilted with respect to a flattened dark halo. The misalignment between the disk and the halo is a common explanation for galactic disk warps, since in this state, disks have precessing bending modes which resemble real warps.
arxiv +1 more source
Revisiting perfect fluid dark matter: Observational constraints from our galaxy
Physics Letters B, 2016 We revisit certain features of an assumed spherically symmetric perfect fluid dark matter halo in the light of the observed data of our galaxy, the Milky Way (MW). The idea is to apply the Faber–Visser approach of combined observations of rotation curves
Alexander A. Potapov +2 more
doaj +1 more source
Evolution of the Galactic Halo and Disk [PDF]
Symposium - International Astronomical Union, 1995 Correlations between stellar kinematics and chemical abundances are fossil evidence for evolutionary connections between Galactic structural components. Extensive stellar surveys show that the only tolerably clear distinction between galactic components appears in the distributions of specific angular momentum.
openaire +3 more sources
DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor
The Astrophysical Journal, 2023 We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail.
Arjun Dey +47 more
doaj +1 more source
EPJ Web of Conferences, 2017 We present our project to calibrate the RR Lyræ period-luminosity-metallicity relation using a sample of Galactic calibrators in the halo and globular clusters.
Marengo Massimo +7 more
doaj +1 more source
A Tilted Dark Halo Origin of the Galactic Disk Warp and Flare [PDF]
, 2023 The outer disk of the Milky Way Galaxy is warped and flared. Several mechanisms have been proposed to explain these phenomena, but none have quantitatively reproduced both features. Recent work has demonstrated that the Galactic stellar halo is tilted with respect to the disk plane, suggesting that at least some component of the dark matter halo may ...
arxiv +1 more source