Galaxy dark matter halos as a research area focuses on the structure, composition, and dynamical role of extended, non-luminous mass distributions surrounding galaxies, investigated primarily through gravitational effects such as rotation curves, strong and weak lensing, satellite kinematics, and large-scale structure. This field addresses halo density profiles, concentration–mass relations, subhalo populations, and their dependence on cosmological parameters and dark matter models (e.g., cold vs. warm). It also studies baryon–halo interactions, including feedback-driven core formation, galaxy–halo connection (abundance matching, halo occupation), and the impact of halos on galaxy formation, evolution, and environmental processes within the cosmological context.
Small and unassuming, Segue 1 is a nearby dwarf galaxy containing only a handful of stars—too few to provide the gravity needed to keep itself from scattering into space. Like other dwarf galaxies, it was long believed that ...
Astronomy
Oct 27, 2025
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An international team of researchers led by the Leibniz Institute for Astrophysics Potsdam (AIP) has shed light on a decades-long debate about why galaxies spin faster than expected—and whether this behavior is caused by ...
Astronomy
Oct 27, 2025
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New research shows that dark matter has a different distribution in our galaxy than previously thought, and that advances dark matter's status as a potential source of the observed gamma ray excess in the Milky Way's center. ...
General Physics
Oct 19, 2025
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737
The nature of dark matter remains one of the greatest mysteries in cosmology. Within the standard framework of non-collisional cold dark matter (CDM), various models are considered: WIMPs (Weakly Interacting Massive Particles, ...
General Physics
Oct 18, 2025
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369
Detecting dark matter—the mysterious substance that holds galaxies together—is one of the greatest unsolved problems in physics. Although it cannot be seen or touched directly, scientists believe dark matter leaves weak signals ...
General Physics
Oct 17, 2025
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207
Johns Hopkins researchers may have identified a compelling clue in the ongoing hunt to prove the existence of dark matter. A mysterious diffuse glow of gamma rays near the center of the Milky Way has stumped researchers for ...
Astronomy
Oct 16, 2025
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249
When Rutgers theoretical astrophysicist Charles Keeton first saw an unusual picture shared by his colleague, he was intrigued.
Astronomy
Sep 16, 2025
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300
Dr. Sukanya Chakrabarti, the Pei-Ling Chan Endowed Chair in the College of Science at The University of Alabama in Huntsville (UAH), and her team have posted a new paper to the arXiv preprint server that for the first time ...
Astronomy
Sep 9, 2025
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111
Ursa Major III, the faintest object in our galaxy, orbits the Milky Way at a distance of more than 30,000 light years. Until now, it was considered a dwarf galaxy, thought to consist mainly of dark matter due to its large ...
Astronomy
Aug 15, 2025
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124
Astronomers at the Center for Astrophysics | Harvard & Smithsonian have proposed a new explanation for some of the universe's most puzzling early galaxies, nicknamed "little red dots."
Astronomy
Aug 11, 2025
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