scholarly journals Measuring Dark Matter by Modeling Interacting Galaxies

2010 ◽  
Author(s):  
H. P. Petsch ◽  
A. Ružička ◽  
Ch. Theis ◽  
Victor P. Debattista ◽  
C. C. Popescu
Keyword(s):  
Dark Matter ◽  
Interacting Galaxies

scholarly journals Galaxy interactions in IllustrisTNG-100, I: The power and limitations of visual identification

2019 ◽  
Vol 492 (2) ◽  
pp. 2075-2094 ◽  
Author(s):  
Kelly A Blumenthal ◽  
Jorge Moreno ◽  
Joshua E Barnes ◽  
Lars Hernquist ◽  
Paul Torrey ◽  
...  
Keyword(s):  
Dark Matter ◽  
Interacting Galaxies ◽  
Galaxy Interactions ◽  
Visual Classification ◽  
Tidal Forces ◽  
Visual Identification ◽  
Merger Rate ◽  
Stellar Masses ◽  
Massive Galaxy

ABSTRACT We present a sample of 446 galaxy pairs constructed using the cosmological simulation IllustrisTNG-100 at z = 0, with M$_{\rm FoF,dm} = 10^{11}\!-\!10^{13.5}$ M⊙. We produce ideal mock SDSS g-band images of all pairs to test the reliability of visual classification schema employed to produce samples of interacting galaxies. We visually classify each image as interacting or not based on the presence of a close neighbour, the presence of stellar debris fields, disturbed discs, and/or tidal features. By inspecting the trajectories of the pairs, we determine that these indicators correctly identify interacting galaxies ∼45 per cent of the time. We subsequently split the sample into the visually identified interacting pairs (VIP; 38 pairs) and those which are interacting but are not visually identified (nonVIP; 47 pairs). We find that VIP have undergone a close passage nearly twice as recently as the non-VIP, and typically have higher stellar masses. Further, the VIP sit in dark matter haloes that are approximately 2.5 times as massive, in environments nearly 2 times as dense, and are almost a factor of 10 more affected by the tidal forces of their surroundings than the nonVIP. These factors conspire to increase the observability of tidal features and disturbed morphologies, making the VIP more likely to be identified. Thus, merger rate calculations which rely on stellar morphologies are likely to be significantly biased toward massive galaxy pairs which have recently undergone a close passage.

scholarly journals The fate of magnetic fields in colliding galaxies

2010 ◽  
Vol 6 (S274) ◽  
pp. 376-380
Author(s):  
Hanna Kotarba ◽  
Harald Lesch ◽  
Klaus Dolag ◽  
Thorsten Naab
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
Magnetic Fields ◽  
Structure Formation ◽  
Large Scale ◽  
Cold Dark Matter ◽  
Gravitational Interaction ◽  
Interacting Galaxies ◽  
Galactic Dynamics

AbstractThe evolution and amplification of large-scale magnetic fields in galaxies is investigated by means of high resolution simulations of interacting galaxies. The goal of our project is to consider in detail the role of gravitational interaction of galaxies for the fate of magnetic fields. Since the tidal interaction up to galaxy merging is a basic ingredient of cold-dark matter (CDM) structure formation models we think that our simulations will give important clues for the interplay of galactic dynamics and magnetic fields.

Is There a Fifth-Force? Using Galaxy Mergers to Constrain Dark-Matter Self-Interactions

2017 ◽  
Author(s):  
Maggie McLean
Keyword(s):  
Dark Matter ◽  
Numerical Simulations ◽  
Fundamental Problem ◽  
Interacting Galaxies ◽  
Galaxy Mergers ◽  
Tidal Disruption ◽  
Fifth Force ◽  
Tidal Forces ◽  
Visible Matter ◽  
The Universe

Over ninety percent of the matter in the universe is believed to be “dark matter,” a mysterious form of matter the nature of which is still unknown. Since it cannot be detected directly, dark matter can only be inferred from its effect on visible matter. This leaves a significant gap in our knowledge. Without the ability to measure the influence of dark matter on other dark matter, we could miss a possible fifth fundamental force which mediates dark matter self-interactions. We propose a means of constraining the existence of a “fifth-force” by observing galaxies that are in the process of merging. Using numerical simulations, we examine the effect of including a hypothetical fifth-force on the tidal disruption of visible matter during galaxy mergers. We find distinct differences in the formation and appearance of tidal features produced during these interactions, providing an observable constraint on the strength of any “fifth-force.” The sheer volume of interacting galaxies that can be observed makes tidal forces a valuable tool in studying a fundamental problem that would otherwise pose a great challenge for physicists.

Dark Matter Inside and Around Binary Galaxies: Formation of Interacting Galaxies

1995 ◽  
pp. 422-422
Author(s):  
J. Anosova ◽  
B. G. Anandarao
Keyword(s):  
Dark Matter ◽  
Interacting Galaxies ◽  
Binary Galaxies

Measuring Dark Matter Halos by Modeling Interacting Galaxies

2004 ◽  
Vol 220 ◽  
pp. 461-462 ◽  
Author(s):  
Christian Theis
Keyword(s):  
Genetic Algorithm ◽  
Dark Matter ◽  
Parameter Space ◽  
Matter Content ◽  
Interacting Galaxies ◽  
Dark Matter Halo ◽  
Dark Matter Halos ◽  
Characteristic Parameters ◽  
Galactic Dark Matter

The richness of tidal features seen in interacting galaxies allows for the determination of their characteristic parameters, provided one can deal with the extended parameter space. Genetic algorithm based methods – like our code minga – have proven to be such a tool. Here I discuss the implementation of dark matter halo descriptions in the restricted N-body simulations of minga. I show that the final morphology of a galaxy encounter strongly depends on the halo properties. Thus, modeling tidal features of interacting galaxies might allow also for conclusions on the galactic dark matter content.

First runs with the ORPHEUS dark matter detector

2002 ◽  
Vol 110 (2) ◽  
pp. 106-108
Author(s):  
G Czapek
Keyword(s):  
Dark Matter

Status of dark matter searches in the Boulby Mine

2002 ◽  
Vol 110 (2) ◽  
pp. 91-93
Author(s):  
S Hart
Keyword(s):  
Dark Matter

Baryonic dark matter

2002 ◽  
Vol 110 (2) ◽  
pp. 16-25 ◽  
Author(s):  
R Rebolo
Keyword(s):  
Dark Matter ◽  
Baryonic Dark Matter

Hunt for dark matter turns to ancient minerals

Nature ◽  
2018 ◽  
Author(s):  
Anil Ananthaswamy
Keyword(s):  
Dark Matter

Existence of RNA 'dark matter' in doubt

Nature ◽  
2010 ◽  
Author(s):  
Melissa Lee Phillips
Keyword(s):  
Dark Matter
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