Results 151 to 160 of about 60,296 (295)

The chemical evolution of elliptical galaxies

The Astrophysical Journal, 1980
U--R colors of elliptical and SO galaxies have been synthesized by combining the stellar populations of galactic globular clusters in accordance with a simple mass-loss chemical evolutionary model. We can account in a satisfactory way for the range, shape, and dispersion of the color-magnitude relation observed by Sandage and Visvanathan.
openaire   +1 more source

Deep‐Ultraviolet (DUV) Raman and Fluorescence of Perchlorates and Chlorates: Implications for the Detection of Oxychlorines by the SHERLOC Instrument in Jezero Crater, Mars

Earth and Space Science, Volume 13, Issue 1, January 2026.
Abstract Oxychlorines (i.e., perchlorates (ClO4−) and chlorates (ClO3−)) have been detected by several landed missions on Mars at various locations. These missions have provided crucial information about the geographic distribution and abundances of oxychlorines on Mars but have not definitively identified the cation and anion type of in situ, solid ...
J. V. Clark, R. S. Jakubek, P. Conrad, E. Cardarelli, D. Buckner, A. Corpolongo, W. J. Abbey, K. Hand, M. Fries, P. Casbeer, S. Siljeström, F. M. McCubbin, S. Sharma, C. Lee, R. Bhartia, A. Steele   +15 more
wiley   +1 more source

Chemical Evolution of Bulges of Active Galactic Nuclei in the Early Universe: Roles of Accreting Stars

The Astrophysical Journal
JWST/NIRCam observations reveal dense stellar cores in high-redshift galactic bulges, indicative of sustained star formation and potential stellar accretion.
Shuo Zhai, Jian-Min Wang, Yan-Rong Li, Wei-jian Guo, Gang Zhao   +4 more
doaj   +1 more source

Chemical evolution and the galactic habitable zone of M31 (the Andromeda Galaxy) [PDF]

, 2012
Leticia Carigi, J. García–Rojas, S. Meneses-Goytia   +2 more
openalex   +1 more source

Enhanced Radiation Exposure of Airline Crew and Passengers During the May 2024 Geomagnetic Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Enhanced radiation at aviation altitudes is a concern for flight crew and passengers. During space weather events, solar flares and coronal mass ejection (CME) driven shocks are sources of energetic particles that can reach Earth's near‐space environment and interact with its magnetic field and atmosphere.
Homayon Aryan, Jacob Bortnik, W. Kent Tobiska, Piyush Mehta, Benjamin Hogan, Rashmi Siddalingappa, Harshitha Challa   +6 more
wiley   +1 more source

Debye‐Scale Bipolar Structures and Their Role in the Electron Trajectory Instability at the Bow Shock

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract A number of mechanisms have been suggested to operate within the terrestrial bow shock to redistribute energy contained in the incoming solar wind flow. The majority of mechanisms involve the generation of turbulence while some are based on particle motion alone.
Simon N. Walker, Michael Gedalin, Michael A. Balikhin   +2 more
wiley   +1 more source

A 13 Billion Year View of Galaxy Growth: Metallicity Gradient Evolution from the Local Universe to z = 9 with JWST and Archival Surveys

The Astrophysical Journal Supplement Series
Galaxy gas-phase metallicity gradients have been extensively studied over the past four decades, both in the local and in the high-redshift Universe, as they trace the baryon cycle and growth of galaxies.
Zihao Li, Zheng Cai, Xin Wang, Zhaozhou Li, Avishai Dekel, Kartick C. Sarkar, Eduardo Bañados, Fuyan Bian, Aklant K. Bhowmick, Laura Blecha, Sarah E. I. Bosman, Jaclyn B. Champagne, Xiaohui Fan, Emmet Golden-Marx, Hyunsung D. Jun, Mingyu Li, Xiaojing Lin, Weizhe Liu, Fengwu Sun, Maxime Trebitsch, Fabian Walter, Feige Wang, Yunjing Wu, Jinyi Yang, Huanian Zhang, Shiwu Zhang, Mingyang Zhuang, Siwei Zou   +27 more
doaj   +1 more source

The Composition of the Sagittarius Dwarf Spheroidal Galaxy and Implications for Nucleosynthesis and Chemical Evolution [PDF]

, 2004
Andrew McWilliam, T. Smecker-Hane
openalex   +1 more source

An Analysis of the Exposure History of Apollo 17 Soils: Exploring Relationships Between Lunar Soil Maturity Indices

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Analysis of space weathering features in lunar regolith using transmission electron microscopy (TEM) allows researchers to characterize the surface exposure timescale of individual grains from the Moon. TEM analysis of regolith grains from Apollo 17 scoop samples, collected from five different locations in the Taurus‐Littrow Valley (TLV), each
J. A. McFadden, M. S. Thompson
wiley   +1 more source

Local variations of the radial metallicity gradient in a simulated NIHAO-UHD Milky Way analogue and their implications for (extra-)galactic studies

The Open Journal of Astrophysics
Radial metallicity gradients are fundamental to understanding galaxy formation and evolution. In our high-resolution simulation of a NIHAO-UHD Milky Way analogue, we analyze the linearity, scatter, spatial coherence, and age-related variations of ...
Sven Buder, Tobias Buck, Qian-Hui Chen, Kathryn Grasha   +3 more
doaj   +1 more source