scholarly journals Determining the local dark matter density with LAMOST data

2016 ◽  
Vol 458 (4) ◽  
pp. 3839-3850 ◽  
Author(s):  
Qiran Xia ◽  
Chao Liu ◽  
Shude Mao ◽  
Yingyi Song ◽  
Lan Zhang ◽  
...  
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Dark Matter Density

scholarly journals Isolated dwarf galaxies: from cuspy to flat dark matter density profiles and metalicity gradients

2010 ◽  
Vol 514 ◽  
pp. A47 ◽  
Author(s):  
S. Pasetto ◽  
E. K. Grebel ◽  
P. Berczik ◽  
R. Spurzem ◽  
W. Dehnen
Keyword(s):  
Dark Matter ◽  
Dwarf Galaxies ◽  
Matter Density ◽  
Density Profiles ◽  
Dark Matter Density

scholarly journals Non-Gaussian inference from non-linear and non-Poisson biased distributed data

2014 ◽  
Vol 10 (S306) ◽  
pp. 258-261
Author(s):  
Metin Ata ◽  
Francisco-Shu Kitaura ◽  
Volker Müller
Keyword(s):  
Dark Matter ◽  
Statistical Inference ◽  
Computer Code ◽  
Matter Density ◽  
Density Field ◽  
Distributed Data ◽  
Dark Matter Density ◽  
Posterior Sampling ◽  
Non Linear ◽  
Non Gaussian

AbstractWe study the statistical inference of the cosmological dark matter density field from non-Gaussian, non-linear and non-Poisson biased distributed tracers. We have implemented a Bayesian posterior sampling computer-code solving this problem and tested it with mock data based onN-body simulations.

scholarly journals NIHAO – IV: core creation and destruction in dark matter density profiles across cosmic time

2016 ◽  
Vol 456 (4) ◽  
pp. 3542-3552 ◽  
Author(s):  
Edouard Tollet ◽  
Andrea V. Macciò ◽  
Aaron A. Dutton ◽  
Greg S. Stinson ◽  
Liang Wang ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Time ◽  
Matter Density ◽  
Density Profiles ◽  
Dark Matter Density

scholarly journals Measuring the local dark matter density with LAMOST DR5 and Gaia DR2

2020 ◽  
Vol 495 (4) ◽  
pp. 4828-4844 ◽  
Author(s):  
Rui Guo ◽  
Chao Liu ◽  
Shude Mao ◽  
Xiang-Xiang Xue ◽  
R J Long ◽  
...  
Keyword(s):  
Dark Matter ◽  
Azimuthal Angle ◽  
Matter Density ◽  
Dwarf Stars ◽  
Dark Matter Density ◽  
The North ◽  
Vertical Data ◽  
Data Release ◽  
The Difference ◽  
North And South

ABSTRACT We apply the vertical Jeans equation to the kinematics of Milky Way stars in the solar neighbourhood to measure the local dark matter density. More than 90 000 G- and K-type dwarf stars are selected from the cross-matched sample of LAMOST (Large Sky Area Multi-Object Fibre Spectroscopic Telescope) fifth data release and Gaia second data release for our analyses. The mass models applied consist of a single exponential stellar disc, a razor thin gas disc, and a constant dark matter density. We first consider the simplified vertical Jeans equation that ignores the tilt term and assumes a flat rotation curve. Under a Gaussian prior on the total stellar surface density, the local dark matter density inferred from Markov chain Monte Carlo simulations is $0.0133_{-0.0022}^{+0.0024}\ {\rm M}_{\odot }\, {\rm pc}^{-3}$. The local dark matter densities for subsamples in an azimuthal angle range of −10° < ϕ < 5° are consistent within their 1σ errors. However, the northern and southern subsamples show a large discrepancy due to plateaux in the northern and southern vertical velocity dispersion profiles. These plateaux may be the cause of the different estimates of the dark matter density between the north and south. Taking the tilt term into account has little effect on the parameter estimations and does not explain the north and south asymmetry. Taking half of the difference of σz profiles as unknown systematic errors, we then obtain consistent measurements for the northern and southern subsamples. We discuss the influence of the vertical data range, the scale height of the tracer population, the vertical distribution of stars, and the sample size on the uncertainty of the determination of the local dark matter density.

scholarly journals Probing a dark matter density spike at the Galactic Center

2014 ◽  
Vol 89 (6) ◽  
Author(s):  
Thomas Lacroix ◽  
Céline Bœhm ◽  
Joseph Silk
Keyword(s):  
Dark Matter ◽  
Galactic Center ◽  
Matter Density ◽  
Dark Matter Density

scholarly journals A new determination of the local dark matter density from the kinematics of K dwarfs

2012 ◽  
Vol 425 (2) ◽  
pp. 1445-1458 ◽  
Author(s):  
Silvia Garbari ◽  
Chao Liu ◽  
Justin I. Read ◽  
George Lake
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Dark Matter Density

scholarly journals The dark matter density at the Sun’s location

2010 ◽  
Vol 523 ◽  
pp. A83 ◽  
Author(s):  
P. Salucci ◽  
F. Nesti ◽  
G. Gentile ◽  
C. Frigerio Martins
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Dark Matter Density

scholarly journals A non-parametric method for measuring the local dark matter density

2016 ◽  
Vol 459 (4) ◽  
pp. 4191-4208 ◽  
Author(s):  
H. Silverwood ◽  
S. Sivertsson ◽  
P. Steger ◽  
J. I. Read ◽  
G. Bertone
Keyword(s):  
Dark Matter ◽  
Parametric Method ◽  
Matter Density ◽  
Dark Matter Density ◽  
Non Parametric

scholarly journals Determination of the local dark matter density in our Galaxy

2010 ◽  
Vol 509 ◽  
pp. A25 ◽  
Author(s):  
M. Weber ◽  
W. de Boer
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Dark Matter Density
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