Results 111 to 120 of about 611,346 (300)

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

Physics Letters B, 2020
Photons may convert to axion-like particles (ALPs) in external magnetic fields. Under certain conditions, this effect should result in irregular features in observed spectra of astrophysical sources.
Maxim Libanov, Sergey Troitsky
doaj   +1 more source

The Spatial Homogeneity of Nebular and Stellar Oxygen Abundances in the Local Group Dwarf Irregular Galaxy NGC 6822 [PDF]

, 2005
To test the existence of a possible radial gradient in oxygen abundances within the Local Group dwarf irregular galaxy NGC 6822, we have obtained optical spectra of 19 nebulae with the EFOSC2 spectrograph on the 3.6 m telescope at ESO La Silla.
Henry Lee, E. Skillman, K. Venn
semanticscholar   +1 more source

Clinical Validation of Artificial Intelligence Algorithms for the Diagnosis of Adult Obstructive Sleep Apnea and Sleep Staging From Oximetry and Photoplethysmography—SleepAI

Journal of Sleep Research, Volume 35, Issue 1, February 2026.
ABSTRACT Home sleep apnea tests (HSATs) have emerged as alternatives to in‐laboratory polysomnography (PSG), but Type IV HSATs often show limited diagnostic performance. This study clinically validates SleepAI, a novel remote digital health system that applies AI algorithms to raw oximetry data for automated sleep staging and obstructive sleep apnea ...
Shirel Attia, Arie Oksenberg, Jeremy Levy, Angeleene Ang, Revital Shani‐Hershkovich, Alissa Adler, Shlomit Katsav, Sharon Haimov, Alexandra Alexandrovich, Riva Tauman, Joachim A. Behar   +10 more
wiley   +1 more source

The stellar structure of irregular galaxies. Face-on galaxies

Astronomy Reports, 2005
Stellar photometry of nearby irregular galaxies of the Local Group is used to identify and study the young and old stellar populations of these galaxies. An analysis of the spatial distributions of stars of different ages in face-on galaxies shows that the young stellar populations in irregular galaxies are concentrated toward the center, and form ...
openaire   +3 more sources

Metal-THINGS: a panchromatic analysis of the local scaling relationships of the dwarf irregular galaxy NGC 1569 [PDF]

, 2023
L. E. Garduño, Javier Zaragoza-Cardiel, M. A. Lara-López, I. A. Zinchenko, M. C. Zerbo, M. E. De Rossi, J. Fritz, Sami Dib, L. S. Pilyugin, M. Sánchez-Cruces, V. Heesen, S. P. O’Sullivan, Omar Lopez‐Cruz, Mabel Valerdi, M. Rosado   +14 more
openalex   +3 more sources

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

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.
ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source

The influences of the Magellanic Clouds on the Galaxy: Pole shift, warp, and star formation history

, 2012
We investigate how the Large Magellanic Cloud (LMC) influences the evolution of the Galaxy after the LMC enters into the virial radius of the dark matter halo of the Galaxy for the first time.
Bekki, Bekki, Bekki, Bekki, Bekki, Besla, Connors, Costa, Diag, Diaz, Diaz, Gardiner, Gardiner, Hunter, Kallivayalil, Keller, Kenji Bekki, Law, Levine, Li, Lin, Mastropietro, McClure-Griffiths, Metz, Momany, Murai, Navarro, Nichols, Olsen, Piatek, Quinn, Reid, Rocha-Pinto, Ruzicka, Subramaniam, Sugimoto, Tsuchiya, Vieira, Weinberg, Weinberg, Wilkinson, Yoshizawa   +41 more
core   +1 more source

Hot Interstellar Gas in the Irregular Galaxy NGC 4449 [PDF]

, 1997
NGC 4449 is an irregular galaxy with a moderately high star formation activity. The massive stars in NGC 4449 have given rise to many bright HII regions, superbubbles, supergiant shells, and "chimney-like" radial filaments.
D. Bomans, Y. Chu, U. I. Urbana-Champaign, Universitatssternwarte Munchen   +3 more
semanticscholar   +1 more source