Results 91 to 100 of about 617 (181)
The density profiles of dark matter halos in spiral galaxies
Natural Science, 2012 In spiral galaxies, we explain their non-Keplerian rotation curves (RCs) by means of a non-luminous component embedding their stellar-gaseous disks. Understanding the detailed properties of this component (labelled Dark Matter, DM) is one of the most pressing issues of Cosmology. We investigate the recent relationship (claimed by Walker et al.
Castignani G +3 more
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The Astrophysical JournalGalaxy merger timescales are crucial for understanding and modeling galaxy formation in our hierarchically structured Universe. However, previous studies have reported widely varying dependencies of merger timescales on initial orbital parameters and ...
Kun Xu, Y. P. Jing
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Dark Matter Distribution in Milky Way analog Galaxies
The Astrophysical JournalOur current understanding of how dark matter (DM) is distributed within the Milky Way (MW) halo, particularly in the solar neighborhood, is based on either careful studies of the local stellar orbits, model assumptions on the global shape of the MW halo,
Natanael G. de Isídio +11 more
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Galaxy Galaxy Lensing as a Probe of Galaxy Dark Matter Halos
, 2006 Gravitational lensing has now become a popular tool to measure the mass distribution of structures in the Universe on various scales. Here we focus on the study of galaxy's scale dark matter halos with galaxy-galaxy lensing techniques: observing the shapes of distant background galaxies which have been lensed by foreground galaxies allows us to map the
Limousin, M., Kneib, J-P., Natarajan, P.
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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
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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
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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
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Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
Galaxies, 2019 The presence of dark matter substructure will boost the signatures of dark matter annihilation. We review recent progress on estimates of this subhalo boost factor—a ratio of the luminosity from annihilation in the subhalos to that originating the ...
Shin’ichiro Ando +2 more
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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
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Globular Cluster Distributions as a Dynamical Probe of Dark Matter
The Astrophysical JournalGlobular clusters (GCs) act as massive probe particles traversing the dark matter halos of their host galaxies. Gravitational dynamical friction due to halo particles causes GC orbits to contract over time, providing a beyond-mean field test of the cold ...
Nativ Ben-Yeda, Kfir Blum, Inbar Havilio
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