Results 61 to 70 of about 51,949 (176)

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

A Possible “Too-many-satellites” Problem in the Isolated Dwarf Galaxy DDO 161

The Astrophysical Journal Letters
The abundance of satellite galaxies provides a direct test of ΛCDM and galaxy formation physics on small scales. While satellites of Milky Way-mass galaxies are well studied, those of dwarf galaxies remain largely unexplored.
Jiaxuan Li, Jenny E. Greene, Shany Danieli, Scott G. Carlsten, Marla Geha   +4 more
doaj   +1 more source

Dynamical galactic effects induced by solitonic vortex structure in bosonic dark matter

European Physical Journal C: Particles and Fields, 2023
The nature of dark matter (DM) remains one of the unsolved mysteries of modern physics. An intriguing possibility is to assume that DM consists of ultralight bosonic particles in the Bose–Einstein condensate (BEC) state. We study stationary DM structures
K. Korshynska, Y. M. Bidasyuk, E. V. Gorbar, Junji Jia, A. I. Yakimenko   +4 more
doaj   +1 more source

Growing Massive Black Holes in a Local Group Environment: the Central Supermassive, Slowly Sinking, and Ejected Populations

, 2011
We explore the growth of < 10^7 Msun black holes that reside at the centers of spiral and field dwarf galaxies in a Local Group type of environment. We use merger trees from a cosmological N-body simulation known as Via Lactea II (VL-2) as a framework to
Abel, Abel, Adams, Aguilar, Alexander, Baes, Baker, Begelman, Begelman, Bellovary, Berczik, Binney, Bogdanovic, Boker, Booth, Boylan-Kolchin, Bromm, Bromm, Bromm, Bullock, Burkert, Campanelli, Cattaneo, Colpi, Cote, Cox, Croton, David, Dekel, Di, Di, Di, Di Steffano, Diemand, Diemand, Dotti, Dotti, Ebisuzaki, Escala, Fan, Fender, Ferrarese, Ferrarese, Ferrarese, Gebhardt, Gebhardt, Ghez, Ghigna, Gnedin, Gonzalez, Gonzalez, Granato, Greenstein, Haehnelt, Haehnelt, Heger, Heggie, Hernquist, Herrmann, Ho, Holley-Bockelmann, Holley-Bockelmann, Holley-Bockelmann, Hopkins, Hopkins, Hopkins, Hopkins, Hu, Islam, Islam, Kauffmann, Kazantzidis, Kelly Holley-Bockelmann, Keres, Kesden, Komossa, Koppitz, Kormendy, Koushiappas, Kravtsov, Lehner, Loeb, Lousto, Maccarone, Maccarone, Maccarone, Mack, Madau, Makino, Marconi, Matthews, Mayer, Melia, Menou, Merloni, Merritt, Merritt, Micic, Micic, Mihos, Miller, Milosavljevic, Milosavljevic, Miroslav Micic, Monaco, Navarro, Nayakshin, Ostriker, O’Sullivan, Pedersen, Portegies, Quataert, Quinlan, Rees, Richstone, Robertson, Sales, Schneider, Schnittman, Schnittman, Sesana, Shakura, Shankar, Sigurdsson, Sijacki, Sijacki, Silk, Sinha, Soltan, Somerville, Sperhake, Steinn Sigurdsson, Taffoni, Tremaine, Trenti, Trenti, Valluri, van der Marel, Volonteri, Volonteri, Volonteri, Weinberg, Wise, Wyithe   +143 more
core   +1 more source

The Coherent Magnetic Field of the Milky Way

The Astrophysical Journal
We present a suite of models of the coherent magnetic field of the Galaxy based on new divergence-free parametric functions describing the global structure of the field.
Michael Unger, Glennys R. Farrar
doaj   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

A Coherence Theory of Jurisprudence in the Spirit of Jhering: A Restatement, Update, and Defence of Jhering’s Early Methodology

Ratio Juris, Volume 38, Issue 3, Page 198-235, November 2025.
Abstract This essay revisits the early methodology of Rudolph von Jhering. It has often been dismissed due to its heavy metaphysics, unwieldy presentation, and alleged neglect of teleology. But a charitable reconstruction in contemporary terms reveals a coherence theory of jurisprudence that is in many ways superior to current coherence accounts.
Pascal Felix Meier
wiley   +1 more source

Devouring the Centaurus A Satellites: Modeling Dwarf Galaxies with Galacticus

The Astrophysical Journal
For the first time, systematic studies of dwarf galaxies are being conducted throughout the Local Volume, including the dwarf satellites of the nearby giant elliptical galaxy Centaurus A (NGC 5128).
Sachi Weerasooriya, Mia Sauda Bovill, Matthew A. Taylor, Andrew J. Benson, Cameron Leahy   +4 more
doaj   +1 more source

HEAD IN THE STARS, FEET ON THE GROUND: Scale and Astronomy Initiatives in Southern Africa

Cultural Anthropology, Volume 40, Issue 4, Page 571-596, November 2025.
ABSTRACT This article explores the evolution of radio astronomy in South Africa and Madagascar, focusing on how “scale” functions as both a way of understanding the world and marking differences in existence. In outer space research, the ground is crucial but often overlooked.
HANNA NIEBER, DAVIDE CHINIGÒ
wiley   +1 more source