scholarly journals INVESTIGATION OF THE DISTRIBUTION OF DARK MATTER IN THE GALACTIC STRUCTURE

2019 ◽  
Vol 5 (327) ◽  
pp. 40-50
Author(s):  
D. Kairatkyzy ◽  
◽  
◽  
Keyword(s):  
Dark Matter ◽  
Galactic Structure

scholarly journals A Historical Perspective on Dark Matter

1987 ◽  
Vol 117 ◽  
pp. 547-549 ◽  
Author(s):  
Scott Tremaine
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Historical Perspective ◽  
Galactic Structure ◽  
Extragalactic Astronomy ◽  
To Come ◽  
State Of Affairs

The dominant impression which I carry away from this meeting is that extragalactic astronomy has reached a crisis (‘a state of affairs in which a decisive change for better or worse is imminent’, according to Fowler). The nature, origin and distribution of the dark matter and its role in galaxy formation and dynamics are issues whose resolution is likely to determine the direction of studies in galactic structure and cosmology for decades to come.

scholarly journals Microlensing With Binaries And Planets

1996 ◽  
Vol 173 ◽  
pp. 233-234
Author(s):  
H.J. Witt ◽  
S. Mao
Keyword(s):  
Dark Matter ◽  
Galactic Halo ◽  
Galactic Structure ◽  
Matter Content

The ongoing microlensing experiments have now discovered more than 70 candidate events (Alcock et al. 1993, Bennett et al. 1994, Aubourg et al. 1993, Udalski et al. 1994). These experiments have put important constraints on the dark matter content of the Galactic halo (Alcock et al. 1995a) and yielded many interesting results about Galactic structure (Paczyński et al. 1994, Stanek et al. 1994).

scholarly journals Asymmetric dark matter: residual annihilations and self-interactions

2018 ◽  
Vol 4 (6) ◽  
Author(s):  
Iason Baldes ◽  
Marco Cirelli ◽  
Paolo Panci ◽  
Kalliopi Petraki ◽  
Filippo Sala ◽  
...  
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Galactic Structure ◽  
The Common ◽  
Asymmetric Dark Matter

Dark matter (DM) coupled to light mediators has been invoked to resolve the putative discrepancies between collisionless cold DM and galactic structure observations. However, \gammaγ-ray searches and the CMB strongly constrain such scenarios. To ease the tension, we consider asymmetric DM. We show that, contrary to the common lore, detectable annihilations occur even for large asymmetries, and derive bounds from the CMB, \gammaγ-ray, neutrino and antiproton searches. We then identify the viable space for self-interacting DM. Direct detection does not exclude this scenario, but provides a way to test it.

Largescale Problems of Galactic Structure and Dynamics

1984 ◽  
Vol 88 ◽  
pp. 223-229
Author(s):  
K.C. Freeman
Keyword(s):  
Dark Matter ◽  
Classical Problem ◽  
Galactic Structure ◽  
Matter Density ◽  
Radial Velocities ◽  
The Other ◽  
The Sun ◽  
Structure And Dynamics ◽  
F Stars ◽  
Total Matter

In tills review, I will talk about some galactic problems for which stellar radial velocities are important. I will not attempt to be comprehensive, but will just pick out some problems which are being actively studied and which I find particularly interesting.This is a classical problem. The aim is to estimate the total matter density near the Sun from the distribution and kinematics of a tracer population towards the galactic poles. Recently Bahcall (1984a,b,c) has made a major attack on this problem, using F stars and W giants. He finds that about half the total matter density near the Sun is unaccounted for. This is important. We know from work on other diek galaxies that about half their mass lies in a dark corona and the other half in the disk; the nature of this dark matter is not yet understood. If we also see that about half the mass of the disk itself is dark, then that is certainly worth knowing, because this dark matter has dissipated to the disk. That may help us to understand the nature of the dark matter.

scholarly journals Preliminary results from simulations on the sub-galactic structure formation

2014 ◽  
Vol 10 (S312) ◽  
pp. 155-156
Author(s):  
Kyungwon Chun ◽  
Jihye Shin
Keyword(s):  
Dark Matter ◽  
Structure Formation ◽  
Cold Dark Matter ◽  
Galactic Structure ◽  
Preliminary Results ◽  
Research Goal ◽  
Hydrodynamic Code

AbstractWe aim to investigate the formation of sub-galactic structure in the Lambda cold dark matter (CDM) cosmology. To accomplish our research goal, we have added various baryonic physics on the existing cosmological hydrodynamic code, GADGET-2. We performed two test runs to check our new implementations. We show our preliminary results from these test runs.

scholarly journals Deep 10 and 15 GHZ Searches for CMB Anisotropies

1992 ◽  
Vol 9 ◽  
pp. 323-325
Author(s):  
R. D. Davies ◽  
A. N. Lasenby
Keyword(s):  
Dark Matter ◽  
Cosmic Microwave Background ◽  
Early Universe ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
Galactic Structure ◽  
Observational Cosmology ◽  
Significant Progress ◽  
Microwave Background ◽  
Observing Systems

The search for anisotropies in the Cosmic Microwave Background (CMB) is fundamental to observational cosmology: it requires observations on a range of angular scales and at a range of frequencies to distinguish CMB structure from foreground galactic structure. We have made significant progress in setting new limits to CMB anisotropies on angular scales of 3°-12° using scaled observing systems at 10 and 15 GHz. This regime of angular scales is particularly matched to the predictions of Cold Dark Matter (CDM) and isocurvature scenarios of galaxy formation in the early Universe.

scholarly journals Observations from Australasia using the Gravitational Microlensing Technique

2000 ◽  
Vol 17 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Philip Yock
Keyword(s):  
Dark Matter ◽  
Galactic Structure ◽  
Gravitational Microlensing ◽  
Limb Darkening ◽  
The Antarctic ◽  
Structure Measurement

AbstractThe astronomical technique of gravitational microlensing provides new opportunities to make measurements which are difficult or impossible by other methods, or which are complementary to those obtained more directly. These include detection of dark matter, determination of galactic structure, measurement of limb darkening of stars, and searches for extra-solar planets. The technique is best suited to the southern sky, and several observations have been made from Australasia. A sample of these observations is described here. A case is also made for a telescope at the Antarctic dedicated to gravitational microlensing.

scholarly journals Galactic Dynamics and Dark Matter with Sub-Milliarcsecond Astrometry

1995 ◽  
Vol 166 ◽  
pp. 247-250
Author(s):  
D. Pfenniger
Keyword(s):  
Dark Matter ◽  
Mass Distribution ◽  
Large Scale ◽  
Galactic Structure ◽  
Solar Neighbourhood ◽  
Galactic Dynamics ◽  
Next Generation ◽  
Matter Distribution ◽  
The Galaxy ◽  
Dark Matter Distribution

Improving the astrometric accuracy by one or two orders of magnitude over ground-based techniques will not only change our raw knowledge about the Galaxy, but it will also modify 1) the fundamental questions that can be addressed, and 2) the stellar dynamical concepts used so far. More detail in Galactic structure, such as the shape and flow in its putative bar, will be accessible. Also, with the instruments of the next generation the large scale dark matter distribution in the Galaxy, whether distributed in a spheroidal smooth halo or a massive outer disc made of cold clumpy gas, will be measurable. Techniques used for mapping the cosmic flow and mass distribution at Mpc scales and more might be applied to the solar neighbourhood to find the degree of clumpiness of the local matter distribution.

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