Article
Astronomy & Astrophysics
J. Runge, S. A. Walker, M. S. Mirakhor
Summary: The study examines the dark matter halo surrounding the nearby galaxy group NGC 1600 and finds that regardless of the assumed dark matter model profile, the halo concentration is an extreme outlier of the Lambda CDM c-M relation. This high concentration value makes NGC 1600 part of a select group of galaxy groups.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
D. Eckert, S. Ettori, A. Robertson, R. Massey, E. Pointecouteau, D. Harvey, I. G. McCarthy
Summary: The distribution of dark matter in the cold dark matter paradigm fits well with the Einasto profile, while self-interacting dark matter leads to flatter mass density profiles. Researchers measured the structural properties of massive galaxy clusters and found that the measurements are consistent with the predictions of the cold dark matter paradigm. The self-interaction cross section of dark matter is found to be lower than what is required to solve the core-cusp problem in dwarf spheroidal galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Xuejian Shen, Thejs Brinckmann, David Rapetti, Mark Vogelsberger, Adam Mantz, Jesus Zavala, Steven W. Allen
Summary: We performed cosmological zoom-in simulations of relaxed cluster-mass haloes with both cold dark matter (CDM) and self-interacting dark matter (SIDM) models. The distributions of dark matter and intracluster gas in SIDM appeared more spherical compared to CDM. We found that the X-ray morphology of observed non-cool-core clusters was better explained by SIDM models with a larger cross-section rather than CDM or SIDM models with a smaller cross-section.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jacob Svensmark, Steen H. Hansen, Davide Martizzi, Ben Moore, Romaine Tessier
Summary: This study introduces a new method to infer the dynamical property of dark matter, namely velocity anisotropy. The results show that the velocity anisotropy of DM in bright galaxy clusters is consistent with numerical simulations, supporting the collisionless nature of DM.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Uri Keshet, Itay Raveh, Yossi Naor
Summary: A clump moving through the intracluster medium of a galaxy cluster can create a bow shock trailed by a bullet-like core. The presence of dark matter can explain certain features seen in X-ray imaging, providing a unique probe for studying offset, collisionless dark matter.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
R. Seppi, J. Comparat, K. Nandra, E. Bulbul, F. Prada, A. Klypin, A. Merloni, P. Predehl, J. Ider Chitham
Summary: This study investigates the impact of the dynamical state of dark matter haloes on the halo mass function using simulations. It reveals that the concentration of low-mass haloes evolves faster with redshift, while the offset parameter decreases. A comprehensive mass function model is proposed to predict the mass function in relation to spin and offset, showing 3% accuracy at redshift 0 and up to z = 1.5.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Viral Parekh, Tatiana F. Lagana, Ruta Kale
Summary: By studying the formation and nature of the RXCJ0232.2-4420 cluster system, researchers detected substructures in the hot gas and confirmed the presence of a cool core through spectral analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. Vega-Ferrero, J. M. Dana, J. M. Diego, G. Yepes, W. Cui, M. Meneghetti
Summary: The study compares the statistics and morphology of giant arcs in galaxy clusters using different models, finding that self-interacting dark matter produces fewer but more magnified arcs. The probability of interaction is higher in colliding clusters and in denser regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Andrea Maccio, Daniel Huterer Prats, Keri L. Dixon, Tobias Buck, Stefan Waterval, Nikhil Arora, Stephane Courteau, Xi Kang
Summary: Through simulations, it has been shown that dwarf galaxies can lose up to 80% of their dark matter content and see a significant change in the dark matter-to-stellar mass ratio after interactions with central galaxies. These findings align with observations of NGC 1052-DF2 and NGC 1054-DF4.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
V Wetzell, T. E. Jeltema, B. Hegland, S. Everett, P. A. Giles, R. Wilkinson, A. Farahi, M. Costanzi, D. L. Hollowood, E. Upsdell, A. Saro, J. Myles, A. Bermeo, S. Bhargava, C. A. Collins, D. Cross, O. Eiger, G. Gardner, M. Hilton, J. Jobel, P. Kelly, D. Laubner, A. R. Liddle, R. G. Mann, V Martinez, J. Mayers, A. McDaniel, A. K. Romer, P. Rooney, M. Sahlen, J. Stott, A. Swart, D. J. Turner, P. T. P. Viana, T. M. C. Abbott, M. Aguena, S. Allam, F. Andrade-Oliveira, J. Annis, J. Asorey, E. Bertin, D. L. Burke, J. Calcino, A. Carnero Rosell, D. Carollo, M. Carrasco Kind, J. Carretero, A. Choi, M. Crocce, L. N. da Costa, M. E. S. Pereira, T. M. Davis, J. De Vicente, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, A. E. Evrard, I Ferrero, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, K. Glazebrook, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, G. F. Lewis, C. Lidman, M. Lima, M. A. G. Maia, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, R. Morgan, A. Palmese, F. Paz-Chinchon, A. A. Plazas Malagon, E. Sanchez, V Scarpine, S. Serrano, I Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, G. Tarle, D. Thomas, B. E. Tucker, D. L. Tucker, T. N. Varga, J. Weller
Summary: This study measures the velocity dispersions of clusters of galaxies selected by the redMaPPer algorithm in the Dark Energy Survey data. The results show that there is a significant population of clusters with higher velocity dispersions than expected based on their richness. These findings suggest that projection effects contribute significantly to the redMaPPer selection, especially at higher redshifts and lower richnesses. More in-depth data is needed to fully understand the nature of these clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Arnab Sarkar, Yuanyuan Su, Scott Randall, Fabio Gastaldello, Isabella Trierweiler, Raymond White, Ralph Kraft, Eric Miller
Summary: The study presents joint Suzaku and Chandra observations of MKW4, revealing a power law relationship in its entropy distribution and significantly lower scatter of gas properties at the outskirts, indicating that MKW4 is a spherically symmetric and highly relaxed system.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Anthony M. Flores, Adam B. Mantz, Steven W. Allen, R. Glenn Morris, Rebecca E. A. Canning, Lindsey E. Bleem, Michael S. Calzadilla, Benjamin T. Floyd, Michael McDonald, Florian Ruppin
Summary: This study analyzed deep X-ray observations of 10 high-redshift galaxy clusters, measuring the metallicity of the intracluster medium and constraining models of metal enrichment at intermediate radii. Results indicate that the metallicity of high-redshift clusters is slightly lower than that of low-redshift clusters, suggesting that most of the ICM enrichment occurred early on.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Charles Thorpe-Morgan, Denys Malyshev, Christoph-Alexander Stegen, Andrea Santangelo, Josef Jochum
Summary: This study reports on a search for dark matter in galaxy clusters using Fermi/LAT data, presenting constraints on the annihilation cross-section for different channels and discussing the potential impact of substructures and uncertainties on the results. The obtained limits are comparable to the best available limits based on observations of dwarf spheroidal galaxies with Fermi/LAT.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Han Aung, Daisuke Nagai, Erwin T. Lau
Summary: Recent studies have found discrepancies between the location of the accretion shock and the splashback radius of dark matter, with the former being larger by 20-100%. This has implications for multiwavelength studies of galaxy clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Arnab Sarkar, Yuanyuan Su, Nhut Truong, Scott Randall, Francois Mernier, Fabio Gastaldello, Veronica Biffi, Ralph Kraft
Summary: We report results from observations of four nearby galaxy groups, which show that their gas properties are similar to those of larger galaxy clusters and support the existence of an early-enrichment scenario. However, there is a discrepancy between the measured iron content and the expected supernova yields. The study also provides constraints on the abundances of other elements and finds consistency with numerical simulations. These findings are important for understanding the formation and evolution of galaxy clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Nils Deppe, Allison Kolly, Andrew Frey, Gabor Kunstatter
PHYSICAL REVIEW LETTERS
(2015)
Article
Physics, Particles & Fields
Nils Deppe, Andrew R. Frey
JOURNAL OF HIGH ENERGY PHYSICS
(2015)
Article
Physics, Particles & Fields
Nils Deppe, Allison Kolly, Andrew R. Frey, Gabor Kunstatter
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Physics, Particles & Fields
Brad Cownden, Andrew R. Frey, M. C. David Marsh, Bret Underwood
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Astronomy & Astrophysics
James M. Cline, Andrew R. Frey
Article
Physics, Particles & Fields
Andrew R. Frey, Michael P. Grehan, Manu Srivastava
Summary: The study reveals that in asymptotically anti-de Sitter spacetime, the volume and action forms of holographic complexity for the gravitational collapse of scalar field matter exhibit quasiperiodic oscillations, showing a scaling symmetry with the amplitude of the scalar field.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Nuclear
M. E. Carrington, A. R. Frey, B. A. Meggison
Summary: This paper studies the effects of anisotropy on phase transitions in graphene. By solving a coupled set of Schwinger-Dyson equations in a low-energy effective field theory, it is shown that anisotropy reduces the critical coupling.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Physics, Particles & Fields
Jiayue Yang, Andrew R. Frey
Summary: This study investigates the holographic complexity of CFTs compactified on a circle and proposes a scaling law for the complexity based on the radius of the circle.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
M. E. Carrington, A. R. Frey, B. A. Meggison
Summary: We investigate the semimetal-insulator phase transition in graphene using a Schwinger-Dyson approach. Different forms of vertex Ansatze are employed to truncate the Schwinger-Dyson equations hierarchy. We introduce a Ball-Chiu-type vertex that preserves gauge invariance and find that a family of such vertices parameterized by a continuous parameter a satisfies the Ward identity. The importance of including vertex contributions self-consistently is highlighted.
Article
Astronomy & Astrophysics
Andrew R. Frey, Ratul Mahanta, Anshuman Maharana
Summary: This article discusses the impact of the relationship between the sector associated with the Standard Model and the dark radiation sector on the observed effective number of neutrino-like species when the early universe enters the Hagedorn phase. Through the study of warped string compactifications, it is found that if the Hubble scale during inflation is high, the Standard Model sector will enter the Hagedorn phase, and bulk axions will no longer pose a threat to dark radiation.
Article
Materials Science, Multidisciplinary
M. E. Carrington, A. R. Frey, B. A. Meggison
Article
Astronomy & Astrophysics
Andrew R. Frey
Article
Astronomy & Astrophysics
Brad Cownden, Nils Deppe, Andrew R. Frey
Article
Astronomy & Astrophysics
Brad Cownden, Andrew R. Frey