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Volume 11, October
 
 

Galaxies, Volume 11, Issue 6 (December 2023) – 13 articles

Cover Story (view full-size image): Gamma-ray burst (GRB) 221009A was unprecedented: it was extremely bright in gamma-rays and X-rays through to the far ultraviolet, allowing follow-up with multiple space and ground-based optical/near-infrared telescopes, and enabling a first association with photons at high TeV energies. That is in direct tension with a potentially observable phenomenon of quantum gravity (QG), where spacetime “foaminess” accumulates in wavefronts propagating cosmological distances, which at high-enough energy could spread photons out over the whole sky without resulting in photon loss. A simple multiwavelength average of foam-induced blurring is described, analogous to atmospheric seeing from the ground. This fits with measured instrumental point-spread functions, yet can still be consistent with the highest-energy localization of GRB221009A. View this paper
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11 pages, 3280 KiB  
Review
Fueling Processes on (Sub-)kpc Scales
Galaxies 2023, 11(6), 120; https://doi.org/10.3390/galaxies11060120 - 13 Dec 2023
20 pages, 8333 KiB  
Article
S0 Galaxies: Outer Gas Accretion through Tidal Interaction and Minor Merging
Galaxies 2023, 11(6), 119; https://doi.org/10.3390/galaxies11060119 - 8 Dec 2023
19 pages, 6571 KiB  
Review
Ionizing Spotlight of Active Galactic Nucleus
Galaxies 2023, 11(6), 118; https://doi.org/10.3390/galaxies11060118 - 7 Dec 2023
24 pages, 603 KiB  
Article
Testing a Lepto-Hadronic Two-Zone Model with Extreme High-Synchrotron Peaked BL Lacs and Track-like High-Energy Neutrinos
Galaxies 2023, 11(6), 117; https://doi.org/10.3390/galaxies11060117 - 6 Dec 2023
8 pages, 310 KiB  
Communication
On the Maximum Energy Release from Formation of Static Compact Objects
Galaxies 2023, 11(6), 116; https://doi.org/10.3390/galaxies11060116 - 21 Nov 2023
11 pages, 1240 KiB  
Article
Holographic Quantum-Foam Blurring Is Consistent with Observations of Gamma-Ray Burst GRB221009A
Galaxies 2023, 11(6), 115; https://doi.org/10.3390/galaxies11060115 - 17 Nov 2023
22 pages, 10637 KiB  
Article
A Study of the Properties and Dynamics of the Disk of Satellites in a Milky-Way-like Galaxy System
Galaxies 2023, 11(6), 114; https://doi.org/10.3390/galaxies11060114 - 16 Nov 2023
13 pages, 1191 KiB  
Article
Quasiperiodic Oscillations and Dynamics of Test Particles around Regular-Kiselev Black Holes
Galaxies 2023, 11(6), 113; https://doi.org/10.3390/galaxies11060113 - 16 Nov 2023
19 pages, 1320 KiB  
Article
Exoplanets around Red Giants: Distribution and Habitability
Galaxies 2023, 11(6), 112; https://doi.org/10.3390/galaxies11060112 - 16 Nov 2023
13 pages, 1673 KiB  
Article
Optimization of Quantum Noise in Space Gravitational-Wave Antenna DECIGO with Optical-Spring Quantum Locking Considering Mixture of Vacuum Fluctuations in Homodyne Detection
Galaxies 2023, 11(6), 111; https://doi.org/10.3390/galaxies11060111 - 9 Nov 2023
43 pages, 12994 KiB  
Article
Simulated Radio and Neutrino Imaging of a Microquasar
Galaxies 2023, 11(6), 110; https://doi.org/10.3390/galaxies11060110 - 9 Nov 2023
11 pages, 1252 KiB  
Communication
On the Possible Asymmetry in Gamma Rays from Andromeda Due to Inverse Compton Scattering of Star Light on Electrons from Dark Matter Annihilation
Galaxies 2023, 11(6), 109; https://doi.org/10.3390/galaxies11060109 - 7 Nov 2023
12 pages, 6216 KiB  
Communication
The Structure of Micro-Variability in the WEBT BL Lacertae Observation
Galaxies 2023, 11(6), 108; https://doi.org/10.3390/galaxies11060108 - 1 Nov 2023
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