scholarly journals MORPHOLOGY OF DWARF GALAXIES IN ISOLATED SATELLITE SYSTEMS

2017 ◽  
Vol 50 (4) ◽  
pp. 111-124 ◽  
Author(s):  
Hong Bae Ann
Keyword(s):  
Dwarf Galaxies ◽  
Satellite Systems

scholarly journals Evolution of galactic planes of satellites in the eagle simulation

2019 ◽  
Vol 488 (1) ◽  
pp. 1166-1179 ◽  
Author(s):  
Shi Shao ◽  
Marius Cautun ◽  
Carlos S Frenk
Keyword(s):  
Galaxy Formation ◽  
Dwarf Galaxies ◽  
Large Fraction ◽  
Orbital Plane ◽  
Opening Angle ◽  
Satellite Orbits ◽  
Satellite Systems ◽  
The Past ◽  
The One ◽  
High Degree

ABSTRACT We study the formation of planes of dwarf galaxies around Milky Way (MW)-mass haloes in the eagle galaxy formation simulation. We focus on satellite systems similar to the one in the MW: spatially thin or with a large fraction of members orbiting in the same plane. To characterize the latter, we introduce a robust method to identify the subsets of satellites that have the most coplanar orbits. Out of the 11 MW classical dwarf satellites, 8 have highly clustered orbital planes whose poles are contained within a 22° opening angle centred around (l, b) = (182°, −2°). This configuration stands out when compared to both isotropic and typical ΛCDM satellite distributions. Purely flattened satellite systems are short-lived chance associations and persist for less than $1\, \rm {Gyr}$. In contrast, satellite subsets that share roughly the same orbital plane are longer lived, with half of the MW-like systems being at least $4\, \rm {Gyr}$ old. On average, satellite systems were flatter in the past, with a minimum in their minor-to-major axes ratio about $9\, \rm {Gyr}$ ago, which is the typical infall time of the classical satellites. MW-like satellite distributions have on average always been flatter than the overall population of satellites in MW-mass haloes and, in particular, they correspond to systems with a high degree of anisotropic accretion of satellites. We also show that torques induced by the aspherical mass distribution of the host halo channel some satellite orbits into the host’s equatorial plane, enhancing the fraction of satellites with coplanar orbits. In fact, the orbital poles of coplanar satellites are tightly aligned with the minor axis of the host halo.

scholarly journals On the stark difference in satellite distributions around the Milky Way and Andromeda

2014 ◽  
Vol 439 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Basilio Yniguez ◽  
Shea Garrison-Kimmel ◽  
Michael Boylan-Kolchin ◽  
James S. Bullock
Keyword(s):  
Radial Distribution ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Dwarf Galaxies ◽  
Sloan Digital Sky Survey ◽  
The Sun ◽  
Angular Anisotropy ◽  
Satellite Systems ◽  
Sky Survey ◽  
Number Counts

Abstract We compare spherically averaged radial number counts of bright (≳105 L⊙) dwarf satellite galaxies within 400 kpc of the Milky Way (MW) and M31 and find that the MW satellites are much more centrally concentrated. Remarkably, the two satellite systems are almost identical within the central 100 kpc, while M31 satellites outnumber MW satellites by about a factor of 4 at deprojected distances spanning 100–400 kpc. We compare the observed distributions to those predicted for Λ cold dark matter (ΛCDM) subhaloes using a suite of 44 high-resolution ∼1012 M⊙ halo zoom simulations, 22 of which are in pairs like the MW and M31. We find that the radial distribution of satellites around M31 is fairly typical of those predicted for subhaloes, while the MW's distribution is more centrally concentrated than any of our simulated ΛCDM haloes. One possible explanation is that our census of bright (≳105 L⊙) MW dwarf galaxies is significantly incomplete beyond ∼100 kpc of the Sun. If there were ∼8–20 more bright dwarfs orbiting undetected at 100–400 kpc distance, then the MW's radial distribution would fall within the range expected from subhalo distributions and also look very much like the known M31 system. We use our simulations to demonstrate that there is enough area left unexplored by the Sloan Digital Sky Survey and its extensions that the discovery of ∼10 new bright dwarfs is not implausible given the expected range of angular anisotropy of subhaloes in the sky.

Development system of metrological maintenance for radio-navigation fields of satellite systems

2001 ◽  
Vol 7 (4) ◽  
pp. 122-125
Author(s):  
V.N. Roman'ko ◽  
◽  
E.N. Khomyakov ◽  
S.T. Cherepkov ◽  
◽  
...  
Keyword(s):  
Development System ◽  
Satellite Systems ◽  
Radio Navigation

Network and Protocol Architectures for Future Satellite Systems

2017 ◽  
Author(s):  
Tomaso de Cola ◽  
Alberto Ginesi ◽  
Giovanni Giambene ◽  
George C. Polyzos ◽  
Vasilios A. Siris ◽  
...  
Keyword(s):  
Satellite Systems
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