scholarly journals Bosonic gas as a galactic dark matter halo

2010 ◽  
Vol 82 (12) ◽  
Author(s):  
L. Arturo Ureña-López ◽  
Argelia Bernal
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Galactic Dark Matter

scholarly journals On measuring the Galactic dark matter halo with hypervelocity stars

2019 ◽  
Vol 487 (3) ◽  
pp. 4025-4036 ◽  
Author(s):  
O Contigiani ◽  
E M Rossi ◽  
T Marchetti
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Galactic Dark Matter

scholarly journals The shape of the dark matter halo revealed from a hypervelocity star

2019 ◽  
Vol 14 (S353) ◽  
pp. 96-100
Author(s):  
Kohei Hattori ◽  
Monica Valluri
Keyword(s):  
Dark Matter ◽  
Posterior Distribution ◽  
Galactic Center ◽  
Dark Matter Halo ◽  
Velocity Data ◽  
Broad Distribution ◽  
Giant Star ◽  
Circular Velocity ◽  
Galactic Dark Matter ◽  
Radial Orbit

AbstractA recently discovered young, high-velocity giant star J01020100-7122208 is a good candidate of hypervelocity star ejected from the Galactic center, although it has a bound orbit. If we assume that this star was ejected from the Galactic center, it can be used to constrain the Galactic potential, because the deviation of its orbit from a purely radial orbit informs us of the torque that this star has received. Based on this assumption, we estimate the flattening of the Galactic dark matter halo by using the Gaia DR2 data and the circular velocity data. Our Bayesian analysis shows that the orbit of J01020100-7122208 favors a prolate halo within ~ 10 kpc from the Galactic center. The posterior distribution of the density flattening q shows a broad distribution at q ≳ 1 and peaks at q ≃ 1.5. Also, 98.5% of the posterior distribution is located at q > 1, highly disfavoring an oblate halo.

scholarly journals WEIGHING THE GALACTIC DARK MATTER HALO: A LOWER MASS LIMIT FROM THE FASTEST HALO STAR KNOWN

2010 ◽  
Vol 718 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Norbert Przybilla ◽  
Alfred Tillich ◽  
Ulrich Heber ◽  
Ralf-Dieter Scholz
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Mass Limit ◽  
Lower Mass ◽  
Halo Star ◽  
Galactic Dark Matter ◽  
Lower Mass Limit

scholarly journals On the Shape of the Galactic Dark Matter Halo

2004 ◽  
Vol 21 (2) ◽  
pp. 212-215 ◽  
Author(s):  
Amina Helmi
Keyword(s):  
Dark Matter ◽  
Numerical Simulations ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Dark Matter Halo ◽  
Dark Halo ◽  
Galactic Dark Matter ◽  
Galactic Potentials ◽  
Strong Contrast

AbstractThe confined nature of the debris from the Sagittarius dwarf to a narrow trail on the sky has recently prompted the suggestion that the dark matter halo of our Galaxy should be nearly spherical (Ibata et al. 2001; Majewski et al. 2003). This would seem to be in strong contrast with predictions from cold dark matter (CDM) simulations, where dark halos are found to have typical density axis ratios of 0.6 to 0.8. Here I present numerical simulations of the evolution of a system like the Sagittarius dSph in a set of Galactic potentials with varying degrees of flattening. These simulations show that the Sagittarius streams discovered so far are too young dynamically to be sensitive to the shape of the dark halo of the Milky Way. The data presently available are entirely consistent with a Galactic dark matter halo that could either be oblate or prolate, with density axis ratios c/a that range from 0.6 to 1.6 within the region of the halo probed by the orbit of the Sagittarius dwarf.

Rotation Curve and Dark Matter Halo profile in Finsler Geometry

2020 ◽  
Author(s):  
Nupur Paul ◽  
Farook Rahaman ◽  
Nasarul Islam ◽  
S.S. De
Keyword(s):  
Dark Matter ◽  
Rotational Velocity ◽  
Finsler Geometry ◽  
Outer Region ◽  
Recent Time ◽  
Dark Matter Halo ◽  
Dark Matter Halos ◽  
Radial Profiles ◽  
Galactic Dark Matter ◽  
Specific Equation

Galactic dark matter is an active area of research in recent time. Several researchers proposed several descriptions of radial profiles of dark matter halos by using N-body simulations. Among them, Navarro, Frenk and White (NFW) dark matter profile provides the most accurate description of dark matter halos. It is believed that dark matter is smooth and distributed uniformly throughout space. Using Finslerian geometrical background and a specific equation of state, we propose a new way to estimate the rotational velocity of galaxies based on the NFW dark matter profile. On small scales the first few distances (about 30 kpc) the velocity increases whereas in the outer region of the galaxies, the rotational velocity is found to be more or less constant which supports observed rotational velocities.

scholarly journals Neutrino propagation in the Galactic dark matter halo

2016 ◽  
Vol 94 (12) ◽  
Author(s):  
P. F. de Salas ◽  
R. A. Lineros ◽  
M. Tórtola
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Galactic Dark Matter ◽  
Neutrino Propagation

scholarly journals DETECTING TRIAXIALITY IN THE GALACTIC DARK MATTER HALO THROUGH STELLAR KINEMATICS. II. DEPENDENCE ON NATURE DARK MATTER AND GRAVITY

2015 ◽  
Vol 805 (1) ◽  
pp. 29 ◽  
Author(s):  
Armando Rojas-Niño ◽  
Luis A. Martínez-Medina ◽  
Barbara Pichardo ◽  
Octavio Valenzuela
Keyword(s):  
Dark Matter ◽  
Dark Matter Halo ◽  
Stellar Kinematics ◽  
Galactic Dark Matter
Sign in / Sign up

Export Citation Format

Share Document