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.
This NASA Hubble Space Telescope image features a galaxy cluster called CL0016+1609, or MACS J0018.5+1626, that is very bright at X-ray wavelengths and is one of the most extensively studied clusters at X-ray and radio wavelengths. ...
Astronomy
Jun 18, 2026
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Two U.S. physicists have suggested that the nine concentric rings surrounding the galaxy LEDA 1313424, also known as the Bullseye galaxy, could have emerged through the quantum behavior of particles of dark matter. Through ...
A Yale-led team of astronomers has found a third galaxy devoid of dark matter—located alongside the other two in a formation that has never been seen before. Astronomers have followed a faint, cosmic trail of gas to a third ...
Astronomy
Jun 16, 2026
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Picture the Milky Way not as a silent pinwheel of stars but as something that quietly sings. Scattered through it are millions of pairs of dead stars, mostly white dwarfs, whirling around each other and stirring ripples in ...
Astronomy
Jun 15, 2026
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The European Space Agency (ESA) has officially adopted ARRAKIHS as a scientific mission, confirming the target launch date of 2030. Matthieu Schaller is part of the science team: "I look forward to learning more about the ...
Astronomy
Jun 11, 2026
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No matter the time or vantage point, from a pre-Neolithic cave to a post-lockdown London high-rise, the predictability of the night sky has always been humanity's symbol of permanence and reassuring stability.
Astronomy
Jun 10, 2026
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Astronomers have identified a possible new example of one of the universe's strangest galaxy types: galaxies that appear to contain little or no dark matter. The newly studied pair, FCC 224 and FCC 240, on the outskirts of ...
3I/ATLAS has caused quite a stir over the last year, inviting astronomers to update what they know about other solar systems as well as our own. However, this third interstellar visitor may have an unexpected impact on our ...
Astronomy
Jun 7, 2026
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On the night of 18 December 2019, a star in our satellite galaxy, the Large Magellanic Cloud, briefly got brighter. Not dramatically nor explosively, just a smooth symmetrical rise and fall in brightness lasting about an ...
Astronomy
May 28, 2026
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Researchers at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, have identified a promising new method for measuring the mass of galaxies orbiting the Milky Way by using pulsars, ...
Astronomy
May 22, 2026
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