Results 81 to 90 of about 73,146 (266)

Galaxy Zoo: 3D – crowdsourced bar, spiral, and foreground star masks for MaNGA target galaxies [PDF]

, 2021
Karen L. Masters, Coleman Krawczyk, Shoaib Shamsi, A. R. Todd, Daniel Finnegan, Matthew A. Bershady, Kevin Bundy, Brian Cherinka, Amelia Fraser-McKelvie, Dhanesh Krishnarao, Sandor Kruk, Richard R. Lane, David R. Law, Chris Lintott, M. R. Merrifield, Brooke Simmons, Anne-Marie Weijmans, Renbin Yan   +17 more
openalex   +1 more source

Commissioning of a combined stereoscopic x‐ray and surface guided radiotherapy system for performing breath hold gated lung radiotherapy

Journal of Applied Clinical Medical Physics, Volume 26, Issue 12, December 2025.
Abstract Background ExacTrac Dynamic (ETD) is a novel patient positioning and motion management system for radiation therapy that combines surface guidance, thermal imaging, and stereoscopic x‐rays for image guidance. This combination of technology enables both intrafraction monitoring and surface‐based breath hold gating capabilities.
Garrett C. Baltz, Steven M. Kirsner
wiley   +1 more source

Cool and warm dust emission from M33 (HerM33es) [PDF]

, 2012
We study the far-infrared emission from the nearby spiral galaxy M33 in order to investigate the dust physical properties such as the temperature and the luminosity density across the galaxy.
Alton, Aniano, B. Koribalski, B. Mookerjea, Bendo, Bendo, Benford, Bernard, Bianchi, Block, Block, Boquien, Boquien, Braine, C. Buchbender, C. Henkel, C. Kramer, Combes, D. Calzetti, Davies, Devereux, Dunne, E. M. Xilouris, E. Rosolowsky, F. Bertoldi, F. Combes, F. Israel, F. S. Tabatabaei, F. van der Tak, Freedman, G. Quintana-Lacaci, G. Stacey, Gerola, Gordon, Gratier, Gratier, Griffin, Haas, Hippelein, Hoopes, J. Braine, Kramer, Kramer, Krüegel, M. Boquien, M. Gonzalez, M. Relaño, Meijerink, Misiriotis, Ott, P. Gratier, P. van der Werf, Paturel, Pilbratt, Poglitsch, R. Beck, R. P. J. Tilanus, Reach, Regan, S. Akras, S. Anderl, S. Lord, S. Verley, Schlegel, Tabatabaei, Tabatabaei, Verley, Verley, Verley, Xilouris, Yang, Young   +71 more
core   +5 more sources

Dynamic Chiral Plasmonic Systems‐Based on Spiropyran Derivatives and Gold Nanorods

Advanced Materials Interfaces, Volume 12, Issue 23, December 8, 2025.
Soft chiral plasmonic nanocomposites are prepared by embedding gold nanorods into spiropyran‐based supramolecular gels. The system self‐assembles into helical structures, enabling plasmonic circular dichroism. When illuminated with UV light spiropyran–merocyanine isomerization occurs, inducing reversible nanoscale reorganization and modulation of the ...
Ewelina Tomczyk, Maciej Bagiński, Dorota Szepke, Wiktor Lewandowski, Michał Wójcik   +4 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

Quantifying the Unwinding Due to Ram Pressure Stripping in Simulated Galaxies

Galaxies
Galaxies moving through the gas of the intracluster medium (ICM) experience ram pressure stripping, which can leave behind a gas tail. When a disk galaxy receives the wind edge-on, however, the characteristic signature is not a typical jellyfish tail ...
Rubens E. G. Machado, Caroline F. O. Grinberg, Elvis A. Mello-Terencio   +2 more
doaj   +1 more source

Disk Galaxy Models Driven by Stochastic Self-Propagating Star Formation

Open Astronomy, 2010
We present a model of chemical and spectrophotometric evolution of disk galaxies based on a stochastic self-propagating star formation scenario. The model incorporates galaxy formation through the process of accretion, chemical and photometric evolution ...
Mineikis T., Vansevičius V.
doaj   +1 more source

The Stochastic‐Dissipative Störmer Problem‐Trajectories and Radiation Patterns

Annalen der Physik, Volume 537, Issue 12, December 2025.
We consider charged particle motion and radiation in a dipole magnetic field, in the presence of friction and of stochastic forces. The numerical solutions of the Langevin equation reveal how these forces modify the complex dynamics of particles, and they offer some new insights into the nonlinear processes relevant to planetary radiation belts ...
Tiberiu Harko, Gabriela Raluca Mocanu
wiley   +1 more source

The Stability of Some Galaxy Disks is Still Perplexing

The Astrophysical Journal, 2023
The problem of how some disk galaxies avoid forming bars remains unsolved. Many galaxy models having reasonable properties continue to manifest vigorous instabilities that rapidly form strong bars and no widely accepted idea has yet been advanced to ...
J. A. Sellwood, R. G. Carlberg
doaj   +1 more source

The curious case of J113924.74+164144.0: a possible new group of galaxies at z = 0.0693

, 2010
J113924.74+164144.0 is an interesting galaxy at z = 0.0693, i.e. D_L ~ 305 Mpc, with tidal-tail-like extended optical features on both sides. There are two neighbouring galaxies, a spiral galaxy J113922.85+164136.3 which has a strikingly similar 'tidal ...
Adelman-McCarthy, Auld, Barnes, Briggs, Carilli, Catinella, Chandreyee Sengupta, Chengalur, Cortese, De Bruyn, Giovanelli, Giovanelli, Haynes, Hota, Howard, Kanekar, Kantharia, Lah, Lah, Lang, N. G. Kantharia, Nirupam Roy, Rots, Sengupta, Verheijen, Verheijen, York, York, Zwaan, Zwaan, Zwaan   +30 more
core   +1 more source