Results 81 to 90 of about 77,751 (271)
Cosmic Ray Transport in the Galaxy: a Review [PDF]
, 2017 The physics of energetic particle propagation in magnetised environments plays a crucial role in both the processes of acceleration and transport of cosmic rays.
Amato, Elena, Blasi, Pasquale
core +2 more sources
Misaligned External Gas Acquisition Boosts Central Black Hole Activities
The Astrophysical JournalOne important question in active galactic nuclei (AGN) is how gas is brought down to the galaxy center. Both internal secular evolution (torque induced by nonaxisymmetric galactic structures such as bars) and external processes (e.g., mergers or ...
Yuren Zhou +8 more
doaj +1 more source
The Constraint of Crewed Mars Missions Based on Current Radiation Dose Measurements
Space Weather, Volume 24, Issue 3, March 2026.Abstract Crewed missions to Mars will be a milestone of future space exploration programs. However, the absence of Earth's magnetic field leaves astronauts directly exposed to unattenuated energetic particles in deep space, primarily galactic cosmic rays (GCRs), resulting in significantly higher radiation levels and enhanced health risks. Understanding
Chao Zhang +4 more
wiley +1 more source
Results from the Search for Tidal Disruption Flares in the GALEX Deep Imaging Survey [PDF]
, 2007 A supermassive black hole in the nucleus of a galaxy will be revealed when a star passes close enough to be torn apart by tidal forces and a UV/X-ray flare is emitted by the stream of stellar debris that plunges into the black hole.
Gezari, Suvi
core
A Modified 3D Biconical Outflow Model: Spatial Constraints on Active Galactic Nuclei–Driven Outflows
The Astrophysical JournalWe present a modified outflow model and its application to constrain ionized outflow properties of active galactic nuclei (AGNs). By adding a rotating disk component to the biconical outflow model of H.-J. Bae & J.-H.
Changseok Kim, Jong-Hak Woo
doaj +1 more source
The Astrophysical Journal Letters, 2023 We study the properties of galaxies hosting mid-infrared outbursts in the context of a catalog of 500,000 galaxies from the Sloan Digital Sky Survey. We find that nuclear obscuration, as inferred by the surrounding dust mass, does not correlate with host
Sierra A. Dodd +7 more
doaj +1 more source
Compact Nuclei in Moderately Redshifted Galaxies [PDF]
The Astrophysical Journal, 1996 12 pages AASTeX manuscript, 3 separate Postscript figures, to be published in ApJ ...
Sarajedini, Vicki L. +3 more
openaire +2 more sources
Shock metamorphic effects in Itokawa phosphates: A comparison with megaregolith‐derived meteorites
Meteoritics &Planetary Science, Volume 61, Issue 3, Page 351-370, March 2026.Abstract Returned regolith samples from the asteroid Itokawa provide a unique opportunity to compare shock metamorphic effects in unconsolidated regolith materials with those preserved in lithified meteorites, that is, megaregolith. We analyzed four Itokawa particles (Ueda—RA‐QD02‐0519, Narahara—RA‐QD02‐0573, Domon—RA‐QD02‐0588, Ishiuchi—RX‐MD03‐0212 ...
E. Dobrică, A. N. Krot, A. J. Brearley
wiley +1 more source
Ultraviolet-Optical observations of the Seyfert 2 Galaxies NGC 7130, NGC 5135 and IC 3639: Implications for the Starburst-AGN Connection [PDF]
, 1998 We present and discuss HST (WFPC2 and FOC) images and UV GHRS spectra plus ground-based near UV through to near IR spectra of three Seyfert 2 nuclei (NGC 7130, NGC 5135 and IC 3639). These galaxies, together to Mrk 477, were selected from a bigger sample
Andrew S. Wilson +36 more
core +2 more sources
Nucleolar dominance arises in Spartina homoploid hybrids and persists after allopolyploidization
The Plant Journal, Volume 125, Issue 5, March 2026.Significance Statement Evolution of nucleolar dominance in Spartina anglica since its origin c. 150 years ago. mC, cytosine methylation; NOR, nucleolar organizer regions. rDNA resides within the NORs. Spartina anglica C.E. Hubbard presents an iconic allopolyploid species that formed only 150 years ago, spreading worldwide since then.
Alena Kuderová +8 more
wiley +1 more source