Results 121 to 130 of about 33,866 (165)
Warps and Bars from the External Tidal Torques of Tumbling Dark Halos
, 2009 The dark matter halos in $\Lambda$CDM cosmological simulations are triaxial and highly flattened. In many cases, these triaxial equilibria are also tumbling slowly, typically about their short axes, with periods of order a Hubble time.
Bailin +38 more
core +1 more source
Probing the Dark Matter Halos of External Galaxies with Stellar Streams
The Astrophysical JournalStellar streams have proven to be powerful tools for measuring the Milky Way’s gravitational potential and hence its dark matter (DM) halo. In the coming years, the Vera Rubin Observatory, Euclid, ARRAKIHS, and the Nancy Grace Roman Space Telescope will ...
Madison Walder +3 more
doaj +1 more source
Line-of-sight Bias in Dark Matter Inferences from Galaxy Cluster Mergers
The Astrophysical JournalIn collisions of galaxy clusters, the lack of displacement between dark matter and galaxies suggests that the dark matter scattering depth is small. This yields an upper limit on the dark matter cross section if the dark matter column density is known ...
David Wittman +2 more
doaj +1 more source
Formation rates of Dark Matter Haloes [PDF]
, 2011 We derive an estimate of the rate of formation of dark matter halos per unit volume as a function of the halo mass and redshift of formation. Analytical estimates of the number density of dark matter halos are useful in modeling several cosmological ...
Bagla, J. S. +3 more
core
Analysis of Galaxies at the Extremes: Failed Galaxy Progenitors in the MAGNETICUM Simulations
The Open Journal of AstrophysicsThere is increasing observational evidence for a “failed galaxy” formation pathway for ultra-diffuse galaxies (UDGs) at low redshift however they currently lack simulated counterparts.
Jonah S. Gannon +7 more
doaj +1 more source
Dark matter in ALFALFA galaxies
Astronomy & AstrophysicsAims. This paper aims to investigate the galaxy-halo connection using a large sample of individual galaxies with H I -integrated spectra. We determined their dark matter content by applying a dynamical method based on H I line ...
Meng Yang +6 more
openaire +2 more sources
Tidal Suppression of Fuzzy Dark Matter Heating in Milky Way Satellite Galaxies
The Astrophysical Journal LettersMany previous studies have imposed stringent constraints on the particle mass of fuzzy dark matter (FDM) by analyzing observations of Galactic satellite galaxies, which show no significant evidence of the heating effect predicted by FDM.
Yu-Ming Yang +3 more
doaj +1 more source
Leaving No Branches Behind: Predicting Baryonic Properties of Galaxies from Merger Trees
The Astrophysical JournalGalaxies play a key role in our endeavor to understand how structure formation proceeds in the Universe. For any precision study of cosmology or galaxy formation, there is a strong demand for huge sets of realistic mock galaxy catalogs, spanning ...
Chen-Yu Chuang +4 more
doaj +1 more source
Accelerating Massive Galaxy Formation with Primordial Black Hole Seed Nuclei
The Astronomical JournalIf massive primordial black holes (PBHs) exist and constitute a fraction of the dark matter, they can dramatically catalyze galaxy formation. By acting as pre-existing, high-density seeds, they can shorten the galaxy assembly time to as little as 100 Myr
Jeremy Mould
doaj +1 more source
The GD-1 Stellar Stream Perturber as a Core-collapsed Self-interacting Dark Matter Halo
The Astrophysical Journal LettersThe GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (CDM) model.
Xingyu Zhang +3 more
doaj +1 more source