Results 81 to 90 of about 125,059 (235)

The astrophysical consequences of intervening galaxy gas on fast radio bursts [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We adopt and analyze results on the incidence and physical properties of damped Ly$ $ systems (DLAs) to predict the astrophysical impact of gas in galaxies on observations of Fast Radio Bursts (FRBs). Three DLA measures form the basis of this analysis: (i) the HI column density distribution, parameterized as a double power-law; (ii) the incidence of ...
Prochaska, J. Xavier, Neeleman, Marcel
openaire   +2 more sources

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Micro-Arcsecond Radio Astrometry

, 2013
Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate the size, luminosity, mass, and ages of most objects ...
Honma, M., Reid, M. J.
core   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Effect of Background Magnetic Field on Ion Weibel Instability With High‐Intensity Short‐Pulse Lasers

Contributions to Plasma Physics, Volume 65, Issue 10, November 2025.
ABSTRACT The effect of finite background magnetic field on magnetic field amplification by Weibel instability using high‐intensity short‐pulse lasers is investigated. We consider Weibel instability for counter‐streaming sub‐relativistic plasma flows generated by shooting pure carbon targets with short‐pulse lasers.
Taiki Jikei, Takanobu Amano, Yosuke Matsumoto, Yasuhiro Kuramitsu   +3 more
wiley   +1 more source

Principal Component Analysis of Molecular Dynamic Trajectories: Concepts, Tools, and Applications

WIREs Computational Molecular Science, Volume 15, Issue 6, November/December 2025.
Principal component analysis (PCA) applied to dynamical systems. Top‐left: PCA of the tip motion of a mechanical spring. Top‐right: dihedral PCA of the trialanine peptide. Bottom‐left: three‐dimensional mapping of the end‐to‐end distance in the space of the first two eigenvectors of a β‐hairpin peptide.
Danilo Roccatano
wiley   +1 more source

Illuminating Galaxy Evolution at Cosmic Noon with ISCEA: the Infrared Satellite for Cosmic Evolution Astrophysics [PDF]

, 2021
Yun Wang, L. Armus, Andrew Benson, E. Daddi, Andreas L. Faisst, Anthony H. Gonzalez, Casey Papovich, Zoran Ninkov, Massimo Robberto, Randall Rose, Thomas Thomas, Rose, Claudia Scarlata, S. A. Stanford, Todd Veach, Zhongxu Zhai, B. A. Benson, L. E. Bleem, Michael W. Davis, G. Hélou, Lynne A. Hillenbrand   +20 more
openalex   +3 more sources

Cosmic Ray Counting Variability From Water‐Cherenkov Detectors as a Proxy of Stratospheric Conditions in Antarctica

Earth and Space Science, Volume 12, Issue 11, November 2025.
Abstract This work examines atmospheric effects on cosmic ray counts observed by a Water‐Cherenkov detector at the Argentine Antarctic Marambio Station. We analyze the influence of ground‐level barometric pressure and geopotential height at various pressure levels on daily particle rates, finding the strongest association at 100 hPa, linked to ...
N. A. Santos, N. Gómez, S. Dasso, A. M. Gulisano, L. Rubinstein, M. Pereira, O. Areso, for the LAGO Collaboration   +7 more
wiley   +1 more source

Theory and laboratory astrophysics [PDF]

Science opportunities in the 1990's are discussed. Topics covered include the large scale structure of the universe, galaxies, stars, star formation and the interstellar medium, high energy astrophysics, and the solar system.
Alcock, Charles, Allamandola, Lou, Chevalier, Roger A., Cline, David B., Dalgarno, Alexander, Elmegreen, Bruce G., Fall, S. Michael, Ferland, Gary J., Mckee, Christopher F., Schramm, David N.   +9 more
core   +1 more source

Estimating Soft X‐Ray Emission From Uranus's Magnetosheath

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract Soft X‐ray emission occurs within planetary magnetosheaths when highly charged solar wind ions undergo charge exchange with neutrals. The emission can provide dynamic views of the magnetosheath and cusps, allowing for investigations of the solar wind interaction with a planetary magnetosphere.
D. Naylor, L. C. Ray, W. R. Dunn, J. M. Jasinski, C. Paty   +4 more
wiley   +1 more source