Results 91 to 100 of about 67,629 (216)

The May 2024 Superstorm Coronal Mass Ejections as Observed by the Psyche Gamma‐Ray and Neutron Spectrometer

Space Weather, Volume 24, Issue 5, May 2026.
Abstract We report new measurements of high‐energy protons ejected by the sun during the May 2024 Ganon superstorm. Our observations were made by the Neutron Spectrometer (NS) on the Psyche spacecraft, which was located at a solar distance of approximately 2 AU and a Sun‐Earth‐Probe separation angle of 75°.
Madison Liebel, Patrick N. Peplowski, David J. Lawrence, Insoo Jun   +3 more
wiley   +1 more source

Star Formation in the Lopsided Galaxy Arp 291

The Astrophysical Journal
We have investigated the star formation process taking place in the lopsided galaxy Arp 291, based on narrowband images in the H α , [N ii ] λ 6583, and [O iii ] λ 5007 emission lines, obtained using the modern tunable photometer MaNGaL at the Caucasus ...
Irina S. Proshina, Dmitriy V. Oparin
doaj   +1 more source

Engineering Asymmetry: How Chirality Boosts Catalysis, Spin Selectivity, and Light–Matter Interactions

ChemPhotoChem, Volume 10, Issue 4, April 2026.
This review connects chiroptical spectroscopy, asymmetric catalysis, and spintronics, revealing how chirality influences the interactions of matter with light, charge, and spin. Across diverse systems, remarkable chiroptical effects emerge, showing among others that high efficiencies can arise without absolute enantiopurity, and that functionality is ...
Charitini Panagiotopoulou, Maedeh Anisi, Changseop Jeong, Kamyar Shameli, J. Lorenzo Alonso‐Gómez, Aras Kartouzian   +5 more
wiley   +1 more source

Here Be SDRAGNs—Spiral Galaxies Hosting Large Double Radio Sources

The Astronomical Journal
We present a sample of large double radio sources hosted by spiral galaxies (spiral double radio active galactic nuclei, SDRAGNs). Candidates were initially selected through the Radio Galaxy Zoo project and subsequently refined using Sloan Digital Sky ...
Jean Tate, William C. Keel, Michael O’Keeffe, O. Ivy Wong, Heinz Andernach, Julie K. Banfield, Alexei Moiseev, Aleksandrina Smirnova, Arina Arshinova, Eugene Malygin, Elena Shablovinskaya, Roman Uklein, Stanislav Shabala, Ray Norris, Brooke D. Simmons, Rebecca Smethurst, Ivan Terentev, Chris Molloy, Victor Linares   +18 more
doaj   +1 more source

On the Spiral Structure of the Milky Way Galaxy

, 2010
We consider the possible pattern of the overall spiral structure of the Galaxy, using data on the distribution of neutral (atomic), molecular, and ionized hydrogen, on the base of the hypothesis of the spiral structure being symmetric, i.e.
A. Cabrera-Lavers, A. D. Chernin, A. E. Piskunov, A. K. Dambis, A. Luna, A. M. Mel’nik, A. M. Mel’nik, B. Elmegreen, B. G. Elmegreen, B. G. Elmegreen, B. G. Elmegreen, C. Clarke, C. Clarke, C. L. Dobbs, D. A. Grabelsky, D. A. Grabelsky, D. M. Gittins, E. Churchwell, E. S. Levine, H. Nakanishi, H. Nakanishi, H. Weaver, J. A. Selwood, J. P. Vallée, J. Vaucouleurs de, L. G. Hou, L. N. Berdnikov, M. J. Reid, M. Messineo, M. S. Seigar, M.S. Seigar, N. M. McClure-Griffiths, P. A. James, R. A. Benjamin, R. Beck, R. C. Kennicutt Jr., R. Shetty, R. X. McGee, S. T. Strasser, T. M. Dame, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov, Yu. N. Efremov   +48 more
core   +1 more source

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

A Comprehensive Analysis on the Nature of the Spiral Arms in NGC 3686, NGC 4321, and NGC 2403

Galaxies
In theoretical investigations, various mechanisms have been put forward to explain the emergence of spiral patterns in galaxies. One of the few ways to find out the nature of spirals in a particular galaxy is to consider the so-called corotation radius ...
Valeria Kostiuk, Alexander Marchuk, Alexander Gusev, Ilia V. Chugunov   +3 more
doaj   +1 more source

The Effect of Corotation on the Radial Gradient of Metallicity of Spiral Galaxies

, 2010
The corotation radius in a spiral galaxy is the radius where the spiral pattern speed has the same velocity of the rotation curve. By compiling results from the literature for 20 spiral galaxies we verified a strong correlation between the radius of the ...
Lepine, J. R. D., Scarano Jr., S.
core   +1 more source

Modeling Study on Energetic Particle Distribution in the Ionospheric South Atlantic Anomaly at Height of the Space Station

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The South Atlantic Anomaly (SAA) in Earth's radiation belt is a critical region that poses significant threats to the safety of Space Stations. This region harbors a high concentration of energetic particles that can penetrate Space Stations, thereby affecting onboard components and posing risks to astronauts.
Xiang Dong, Tao Yang, Mingchen Sun, Haimeng Li, Qinglin Zhu, Yifan Zhang   +5 more
wiley   +1 more source

The Theory of Spiral Structure of Galaxies [PDF]

Symposium - International Astronomical Union, 1970
A Landau-type instability mechanism for generating spiral waves is suggested.Two populations of stars, Populations I and II, are considered, the second one with mean rotational velocity zero. Then a dispersion relation is derived which is reduced to the Lin-Shu dispersion relation in the case of vanishing Population II. The amplification of the wave is
openaire   +1 more source