Results 31 to 40 of about 5,843,387 (165)

Observational Evidence of Dust Evolution in Supernova Remnants: Size Redistribution toward Larger Grains in the Early Sedov Phase

The Astrophysical Journal Letters
Recent observations have revealed that dust is widespread and abundant in galaxies up to z  ≃ 8, significantly influencing their appearance and spectral properties.
He Zhao, Bingqiu Chen, Jun Li
doaj   +1 more source

Surface ages of alluvial fans in the southern Central Andes recorded by ground‐ and space‐based hyperspectral reflectance

Earth Surface Processes and Landforms, Volume 51, Issue 8, August 2026.
Secondary weathering of alluvial‐fan surfaces records the relative, and even absolute, ages of deposited sediments up to 300 ka. Hyperspectral imagery quantifies evolving mineral‐weathering pathways to unlock high‐resolution mapping and dating of these sedimentary landscapes.
Henry T. Crawford, Mitch K. D'Arcy, Andreas Ruby, Ana Laura Martínez López, Philippa J. Mason, Taylor F. Schildgen, Ricardo N. Alonso   +6 more
wiley   +1 more source

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

The Astrophysical Journal
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the ...
Ruoyi Zhang, Haibo Yuan, Bowen Huang, Tao Wang, Lin Yang, Gregory M. Green, Xiangyu Zhang   +6 more
doaj   +1 more source

Computing consensus: Language ideological work in LLM‐assisted deliberative democracy

Journal of Linguistic Anthropology, Volume 36, Issue 2, August 2026.
Abstract This article examines how the digital platform Polis and its experiments with large language models (LLMs) reconfigure democratic participation through a particular vision of consensus. Through analysis of media coverage of Polis and developers' public discussions of the platform, I argue that developers reframe consensus from a discursive ...
Janet E. Connor
wiley   +1 more source

A First Measurement of Circumgalactic Dust Reddening from Only 4.6 deg2 of the Rubin Observatory’s Data Preview 1

The Astrophysical Journal Letters
We present the first measurement of circumgalactic dust reddening from the Vera C. Rubin Observatory, using only 4.6 deg ^2 of ComCam Data Preview 1—roughly 0.03% of the final LSST footprint. Using photometric redshifts, we stack background-galaxy colors
John Franklin Crenshaw, Matthew McQuinn, Jessica K. Werk   +2 more
doaj   +1 more source

Visible, near‐, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 1788-1805, August 2026.
Abstract Remote spectroscopy is used to characterize the mineralogy and infer the history of planetary bodies. Carbonaceous asteroids, such as B‐type (101955) Bennu, represent the earliest stages of planet formation. B types have a blue (negative) spectral slope and comprise <5% of asteroids.
V. E. Hamilton, E. A. Cloutis, R. E. Milliken, P. Haenecour, D. R. Golish, K. J. Domanik, T. J. McCoy, L. P. Keller, A. A. Simon, H. H. Kaplan, C. A. Goodrich, S. A. Sandford, D. Applin, T. Hiroi, D. H. Hill, N. G. Lunning, F. M. McCubbin, S. A. Eckley, C. J. Snead, E. H. Blumenfeld, J. E. Aebersold, C. Schultz, N. Bowles, K. A. Shirley, S. S. Russell, J. J. Barnes, T. J. Zega, D. N. DellaGiustina, A. J. Ryan, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr., D. S. Lauretta   +32 more
wiley   +1 more source

Interstellar reddening in the galaxy [PDF]

, 1964
Objective prism spectra obtained with the 16/24/60-inch Schmidt telescope have been used for an investigation of the wavelength dependence of interstellar absorption in the spectral range from 8000A to 3450A, in a region of 30 square degrees in ...
Nandy, Kashi Nath
core  

Data-driven Stellar Intrinsic Colors and Dust Reddenings for Spectrophotometric Data: From the Blue-edge Method to a Machine Learning Approach

The Astrophysical Journal
Intrinsic colors (ICs) of stars are essential for studies on both stellar physics and dust reddening. In this work, we developed an XGBoost model to predict ICs with the atmospheric parameters T _eff , ${\rm{log}}\,g$ , and [M/H].
He Zhao, Shu Wang, Biwei Jiang, Jun Li, Dongwei Fan, Yi Ren, Xiaoxiao Ma   +6 more
doaj   +1 more source

Assessing the Effects of Composition and Surface Roughness on the Photopolarimetric Response of Planetary Regoliths

The Astrophysical Journal Supplement Series
This study is part of an ongoing project in which we experimentally examine the effect of composition (refractive index) and surface roughness on the scattering matrix elements of a set of well-characterized rough regolith simulants.
Francisco J. García-Izquierdo, Elisa Frattin, Julia Martikainen, Olga Muñoz, Alvaro Alvarez-Candal, Fernando Moreno, María Passas-Varo, Juan Carlos Gómez-Martín, Teresa Jardiel, Marco Peiteado, Amador C. Caballero, Gorden Videen, Johannes Markkanen, Antti Penttilä, Karri Muinonen   +14 more
doaj   +1 more source

RECOVER Guidelines: First Aid for Dogs and Cats. Clinical Guidelines

Journal of Veterinary Emergency and Critical Care, Volume 36, Issue S1, Page S36-S62, August 2026.
ABSTRACT Objective To present evidence‐ and consensus‐based guidelines for prehospital first aid in dogs and cats. Design Prioritized clinical questions pertaining to first aid posed in the Population–Intervention–Comparator–Outcome (PICO) format were used to inform systematic literature searches by information specialists, which facilitated extraction
Deborah C. Mandell, Vincent J. Thawley, Jamie M. Burkitt‐Creedon, Daniel J. Fletcher, Manuel Boller, Erik Fausak   +5 more
wiley   +1 more source