Results 161 to 170 of about 346,903 (248)

Unveiling the formation channels of stellar halos through their chemical fingerprints

Context. Stellar halos around galaxies contain key information about their formation and assembly history. Using simulations, we can trace the origins of different stellar populations in these halos, contributing to our understanding of galaxy evolution.
Lucas Bignone, Elisa A. Tau, Emanuel Sillero, Jenny Gonzalez-Jara, Patricia B. Tissera, Diego Pallero, Susana Pedrosa, Antonela Monachesi, Brian Tapia-Contreras   +8 more
core   +2 more sources

Exploration of Halo Substructures in Integrals-of-motion Space with Gaia Data Release 3

The Astrophysical Journal
Using kinematic data from the Gaia Data Release 3 catalog, along with metallicity estimates robustly derived from Gaia BP/RP spectra, we have explored the Galactic stellar halo in search of both known and potentially new substructures.
Haoyang Liu, Cuihua Du, Dashuang Ye, Jian Zhang, Mingji Deng   +4 more
doaj   +1 more source

Active Neutron Spectroscopy to Determine the Hydration of Low‐Mass, Sealed Mars Samples

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract Mars samples returned to Earth as part of the NASA Mars Sample Return program (MSR) will be subject to a wide range of scientific analyses, many of which will have important implications for the search for life/habitability and planetary evolution. Critical to both of these is the hydration state of the samples. But to ensure the most accurate
Sean Czarnecki, Patrick Gasda, Katherine E. Mesick, Carey Legett, Craig Hardgrove   +4 more
wiley   +1 more source

An empirical model to form and evolve galaxies in dark matter halos

, 2016
Based on the star formation histories of galaxies in halos with different masses, we develop an empirical model to grow galaxies in dark matter halos. This model has very few ingredients, any of which can be associated with observational data and thus be
Shi, Feng, Tweed, Dylan, Yang, Lei, Yang, Xiao-Hu, Luo, Wen-Tao, Liu, Cheng-Ze, Lu, Yi, Wei, Jian-Wen, Zhang, You-Cai, Li, Shi-Jie, Wang, Hui-Yuan   +10 more
core   +1 more source

Progenitor Diversity in the Accreted Stellar Halos of Milky Way–like Galaxies

The Astrophysical Journal
Ongoing large stellar spectroscopic surveys of the Milky Way seek to reconstruct the major events in the assembly history of the Galaxy. Chemical and kinematic observations can be used to separate the contributions of different progenitor galaxies to the
Sy-Yun Pu, Andrew P. Cooper, Robert J. J. Grand, Facundo A. Gómez, Antonela Monachesi   +4 more
doaj   +1 more source

Flux Reconstruction With Machine Learning Techniques for the ESA JUICE Mission Radiation Monitor, RADEM

Space Weather, Volume 24, Issue 11, November 2026.
Abstract Solar energetic particles (SEPs) are a significant space weather hazard to spacecraft. For Radiation Hardness Assurance (RHA) in future space missions, it is important to characterize the differential flux spectra of SEP events. In this paper, we present a machine learning model developed for reconstructing the differential flux spectrum from ...
Rafael Parente, Marco Pinto, Inês Ochoa, António Gomes, Patrícia Gonçalves   +4 more
wiley   +1 more source

Igniting Galaxy Formation in the Postreionization Universe

The Astrophysical Journal
It is widely believed that the ultraviolet background produced during the epoch of reionization conspires against the formation of low-mass galaxies. Indeed, this mechanism is often invoked as part of the solution to the so-called “missing satellites ...
Jorge Moreno, Coral Wheeler, Francisco J. Mercado, M. Katy Rodriguez Wimberly, Jenna Samuel, Pratik J. Gandhi, Elia Cenci, Robert Feldmann, Michael Boylan-Kolchin, Andrew Wetzel, James S. Bullock, Philip F. Hopkins   +11 more
doaj   +1 more source

Energy Spectra of High Energy Helium An Extended and Improved Data Product From SOHO EPHIN

Space Weather, Volume 24, Issue 11, November 2026.
Abstract Context. The Electron Proton Helium INstrument (EPHIN) aboard the SOlar and Heliospheric Observatory (SOHO) is a particle telescope that measures energetic protons and Helium particles with kinetic energies above 4 MeV/nuc and electrons with kinetic energies above 150 KeV. Located at the Lagrangian point L1 of the Earth‐Sun system, it provides
M. Hörlöck, B. Heber, S. Jensen, M. Köberle, P. Kühl, H. Sierks   +5 more
wiley   +1 more source

The Formation of Stellar Halos in Late-Type Galaxies

, 2015
Near-field observations may provide tight constraints - i.e. "boundary conditions" - on any model of structure formation in the Universe. Detailed observational data have long been available for the Milky Way (e.g. Freeman $\&$ Bland-Hawthorn 2002) and have provided tight constraints on several Galaxy formation models (e.g. Abadi et al. 2003, Bekki
openaire   +2 more sources

Baryonic Imprints on DM Halos: the concentration-mass relation and its dependence on halo and galaxy properties

The Open Journal of Astrophysics
The halo concentration-mass relation has ubiquitous use in modeling the matter field for cosmological and astrophysical analyses, and including the imprints from galaxy formation physics is tantamount to its robust usage.
Mufan Shao, Dhayaa Anbajagane
doaj   +1 more source