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 Mass models of gas-rich void dwarf galaxies

2019 ◽  
Vol 491 (4) ◽  
pp. 4993-5014 ◽  
Author(s):  
Sushma Kurapati ◽  
Jayaram N Chengalur ◽  
Peter Kamphuis ◽  
Simon Pustilnik
Keyword(s):  
Dark Matter ◽  
Dwarf Galaxies ◽  
Matter Density ◽  
Field Analysis ◽  
Dark Matter Halo ◽  
Normal Density ◽  
Density Profiles ◽  
Dark Matter Density ◽  
Average Slope ◽  
Systematic Effects

ABSTRACT We construct mass models of eight gas rich dwarf galaxies that lie in the Lynx–Cancer void. From NFW fits to the dark matter halo profile, we find that the concentration parameters of haloes of void dwarf galaxies are similar to those of dwarf galaxies in normal density regions. We also measure the slope of the central dark matter density profiles, obtained by converting the rotation curves derived using 3D (fat) and 2D (ROTCUR) tilted ring fitting routines, into mass densities. We find that the average slope (α = −1.39 ± 0.19), obtained from 3D fitting is consistent with that expected from an NFW profile. On the other hand, the average slope measured using the 2D approach is closer to what would be expected for an isothermal profile. This suggests that systematic effects in velocity field analysis have a significant effect on the slope of the central dark matter density profiles. Given the modest number of galaxies we use for our analysis, it is important to check these results using a larger sample.

scholarly journals HIGH-RESOLUTION DARK MATTER DENSITY PROFILES OF THINGS DWARF GALAXIES: CORRECTING FOR NONCIRCULAR MOTIONS

2008 ◽  
Vol 136 (6) ◽  
pp. 2761-2781 ◽  
Author(s):  
Se-Heon Oh ◽  
W. J. G. de Blok ◽  
Fabian Walter ◽  
Elias Brinks ◽  
Robert C. Kennicutt
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
Dwarf Galaxies ◽  
Matter Density ◽  
Density Profiles ◽  
Dark Matter Density

Tidal evolution of dwarf galaxies with shallow dark matter density profiles

2012 ◽  
Vol 10 (H16) ◽  
pp. 346-346
Author(s):  
Ewa L. Łokas
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Local Group ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Morphological Evolution ◽  
Matter Density ◽  
Density Profiles ◽  
Tidal Evolution ◽  
Dark Matter Density

AbstractOne of the scenarios for the formation of dwarf spheroidal galaxies in the Local Group proposes that the objects formed from late type dwarfs via tidal interaction with bigger galaxies such as the Milky Way and Andromeda. The scenario naturally explains the morphology-density relation observed for dwarf galaxies in the Local Group. Using N-body simulations we study the long-term tidal evolution of dwarf galaxies in the vicinity of the Milky Way. The dwarf galaxies were initially composed of stellar disks embedded in dark matter haloes of different inner density slopes including shallow ones recently obtained in N-body+hydro simulations of dwarf galaxy formation in isolation. Such progenitors were placed on five different orbits around the Milky Way and their evolution was followed for 10 Gyr. The outcome of the evolution, in terms of the mass loss, morphological transformation and randomization of stellar orbits depends very sensitively on the inner density slope of dark matter. The effects of tides are stronger for dwarfs with shallower slopes; they are more heavily stripped, in some cases down to the scale of ultra-faint satellites of the Milky Way or even dissolved completely with obvious implications for the missing satellites problem. The morphological evolution of the stellar component, from rotationally supported disks to spheroids dominated by random motions, also proceeds faster. In addition, bars which usually form at the first pericenter passage are created more easily and live longer in dwarfs with shallow dark matter density profiles on extended orbits.

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 On the physical origin of dark matter density profiles

2004 ◽  
Vol 352 (4) ◽  
pp. 1109-1120 ◽  
Author(s):  
Y. Ascasibar ◽  
G. Yepes ◽  
S. Gottlöber ◽  
V. Müller
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Physical Origin ◽  
Density Profiles ◽  
Dark Matter Density

scholarly journals Diversity of Dark Matter Density Profiles in the Galactic Dwarf Spheroidal Satellites

2020 ◽  
Vol 904 (1) ◽  
pp. 45 ◽  
Author(s):  
Kohei Hayashi ◽  
Masashi Chiba ◽  
Tomoaki Ishiyama
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Density Profiles ◽  
Dark Matter Density

scholarly journals Dark matter density profiles: a comparison of nonextensive theory with N-body simulations

2006 ◽  
Vol 453 (1) ◽  
pp. 21-25 ◽  
Author(s):  
T. Kronberger ◽  
M. P. Leubner ◽  
E. van Kampen
Keyword(s):  
Dark Matter ◽  
Matter Density ◽  
Density Profiles ◽  
Dark Matter Density
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