Results 71 to 80 of about 37,989 (204)

Evidence of Extreme Ionization Conditions and Low Metallicity in GHZ2/GLASS-Z12 from a Combined Analysis of NIRSpec and MIRI Observations

The Astrophysical Journal
GHZ2/GLASS-z12, one of the most distant galaxies found in JWST observations, has been recently observed with both the NIRSpec and MIRI spectrographs, establishing a spectroscopic redshift z _spec = 12.34 and making it the first system at z > 10 with ...
Antonello Calabrò, Marco Castellano, Jorge A. Zavala, Laura Pentericci, Pablo Arrabal Haro, Tom J. L. C. Bakx, Denis Burgarella, Caitlin M. Casey, Mark Dickinson, Steven L. Finkelstein, Adriano Fontana, Mario Llerena, Sara Mascia, Emiliano Merlin, Ikki Mitsuhashi, Lorenzo Napolitano, Diego Paris, Pablo G. Pérez-González, Guido Roberts-Borsani, Paola Santini, Tommaso Treu, Eros Vanzella   +21 more
doaj   +1 more source

On the detectability of primordial black holes in the Galaxy

, 2009
10 pages, 3 figures, paper to be presented at ICRC ...
Becker, Julia K., Abramowicz, Marek A., Biermann, Peter L.   +2 more
openaire   +2 more sources

Initial study of regolith exposure ages and burial conditions on Ryugu: Cosmogenic nuclides score in two touchdowns

Meteoritics &Planetary Science, Volume 61, Issue 4, Page 565-579, April 2026.
Abstract Surface processes on the asteroid Ryugu have been investigated using cosmic‐ray‐produced radionuclides, 10Be, 26Al, and 36Cl, and stable noble gases, on eight samples returned by the Hayabusa2 spacecraft. The 10Be and 26Al along with 21Ne measurements indicate that the two Chamber A samples A0105 collected during the first touchdown (TD) were ...
Kunihiko Nishiizumi, Keisuke Nagao, Marc W. Caffee, Ryuji Okazaki, Jozef Masarik, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hiroshi Naraoka, Hikaru Yabuta, Kanako Sakamoto, Kasumi Yogata, Toru Yada, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda, Masanao Abe, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Hirotaka Sawada, Satoshi Tanaka, Tomohiro Usui, Koji Wada, Hajime Yano, Makoto Yoshikawa, Hayabusa2 Initial Analysis Volatile Team   +30 more
wiley   +1 more source

Dissecting the Massive Pristine, Neutral Gas Reservoir of a Remarkably Bright Galaxy at z = 14.179

The Astrophysical Journal Letters
At cosmic dawn, the first stars and galaxies are believed to form from and be deeply embedded in clouds of dense, pristine gas. Here we present a study of the James Webb Space Telescope/NIRSpec data of the most distant, spectroscopically confirmed galaxy
Kasper E. Heintz, Clara L. Pollock, Joris Witstok, Stefano Carniani, Kevin N. Hainline, Francesco D’Eugenio, Chamilla Terp, Aayush Saxena, Darach Watson   +8 more
doaj   +1 more source

Strong Primordial Inhomogeneities and Galaxy Formation

, 2002
The new element of theory of galaxy formation, strong primordial inhomogeneities, is shown to be a reflection of unstable large scale structures of topological defects, created in second order phase transitions in the inflationary Universe. In addition to {\it archioles-like} large scale correlation of the primordial inhomogeneity of energy density of ...
Khlopov, M. Yu., Rubin, S. G., Sakharov, A. S.   +2 more
openaire   +2 more sources

Al‐Khadhaf: The first camera‐observed (H5–6) meteorite fall from Oman

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 522-547, March 2026.
Abstract A fireball camera system installed in 2022 by the Oman Meteorite Monitoring Project (OMMP) as part of the Global Fireball Observatory (GFO) recorded a 3.2 s fireball on March 8, 2022 at 8:15 p.m. UTC. A meteoroid of 4 ± 2 kg entered the atmosphere at 14.0 km/s.
Anna Zappatini, Edwin Gnos, Beda A. Hofmann, Urs Eggenberger, Pascal M. Kruttasch, Frank Gfeller, Mohammad Tauseef, Ingo Leya, Hadrien A. R. Devillepoix, Eleanor K. Sansom, Martin Cupák, Sophie E. Deam, Thomas W. C. Stevenson, Peter Jenniskens, Sebastian Lindemann, Beat Booz, Muati. S. Al‐Muati, Abdulmunaim A. Al‐Zakwani, Hussain A. Al‐Ghafri   +18 more
wiley   +1 more source

1000–10,000 M⊙ Primordial Stars Created the Nitrogen Excess in GS 3073 at z = 5.55

The Astrophysical Journal Letters
The advent of the James Webb Space Telescope has revealed a wealth of new galaxies just a few hundred Myr after the Big Bang, a few of which exhibit unusual N/O ratios that are difficult to explain with stellar populations today.
Devesh Nandal, Daniel J. Whalen, Muhammad A. Latif, Alexander Heger   +3 more
doaj   +1 more source

Primordial Random Motions and Angular Momenta of Galaxies and Galaxy Clusters

The Astrophysical Journal, 1973
We study the decay of primordial random motions of galaxies and galaxy clusters in an expanding universe by solving a kinetic equation for the relaxation of differential energy spectra N(E, t). Systematic dissipative energy losses are included, involving gravitational drag by, and accretion of, intergalactic matter, as well as the effect of collisions ...
Joseph Silk, Susan Lea
openaire   +1 more source

Axion Black Hole Solution in Non‐Metricity Gravity

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract A static, spherically symmetric black hole solution in symmetric teleparallel (non‐metricity) gravity sourced by an axion field is constructed. Starting from the modified field equations, exact configurations are obtained characterized by the mass M$M$ and an axion–geometry coupling β$\beta$, with temporal metric function A(r)=1−2Mr+βr$A(r)=1-\
A. Eid, G.G.L. Nashed
wiley   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source