Results 81 to 90 of about 954,000 (309)

The abundance of dark galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
We show that gas in a large fraction of low mass dark matter halos may form Toomre stable disks, if angular momentum is conserved when the gas contracts. Such halos would be stable to star formation and therefore remain dark. This may potentially explain the discrepancy between the predicted and observed number of dwarf satellites in the Local Group ...
Verde, Licia, Oh, S. Peng, Jimenez, Raul
openaire   +2 more sources

The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants

The Astrophysical Journal
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [ Z ] =
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin, Lucas M. Macri, Wenlong Yuan, Siyang Li, Gagandeep S. Anand, Adam G. Riess   +7 more
doaj   +1 more source

Abundances of Cu and Zn in metal-poor stars: Clues for Galaxy evolution [PDF]

, 2002
We present new observations of copper and zinc abundances in 90 metal-poor stars, belonging to the metallicity range −3 100). The trend of Cu and Zn abundances as a function of the metallicity (Fe/H) is discussed and compared to that of other heavy ...
T. Mishenina, V. Kovtyukh, C. Soubiran, C. Travaglio, Maurizio Busso   +4 more
semanticscholar   +1 more source

From Sample to Mixed Reality: A Translational 3D MALDI Imaging Platform for Advanced 3D Spatial Omics Analysis of 3D Cell Culture Disease Models

Advanced Science, EarlyView.
A comprehensive technology platform enables high‐fidelity, volumetric MALDI imaging of 3D cell cultures by integrating custom embedding molds, a semi‐automated computational framework for 3D reconstruction, voxel‐instead of pixel‐based biomarker discovery, and immersive mixed reality data exploration.
Stefania Alexandra Iakab, Jonas Cordes, Thomas Enzlein, Florian Keller, Kevin Kastner, Theresa Mulholland, Björn Christian Fröhlich, Lars Gruber, James Lucas Cairns, Stefan Schmidt, Mathias Hafner, Richard Schneider, Johannes Betge, Frank Fischer, Julian Reichwald, Rüdiger Rudolf, Carsten Hopf   +16 more
wiley   +1 more source

The galaxy clustering crisis in abundance matching [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Abstract Galaxy clustering on small scales is significantly underpredicted by sub-halo abundance matching (SHAM) models that populate (sub-)haloes with galaxies based on peak halo mass, Mpeak. SHAM models based on the peak maximum circular velocity, Vpeak, have had much better success.
Duncan Campbell, Frank C van den Bosch, Nikhil Padmanabhan, Yao-Yuan Mao, Andrew R Zentner, Johannes U Lange, Fangzhou Jiang, Antonia Sierra Villarreal   +7 more
openaire   +2 more sources

The Gut Commensal Butyricimonas Virosa Modulates Gut Microbiota‐Dependent Thiamine Metabolism and Attenuates Mouse Steatotic Liver Disease

Advanced Science, EarlyView.
This study reveals that dietary stachyose enriches Butyricimonas virosa, effectively attenuating metabolic dysfunction‐associated steatotic liver disease (MASLD). Mechanistically, B. virosa enhances gut thiamine monophosphate synthesis, which elevates hepatic thiamine pyrophosphate levels.
Ningning He, Haoyu Wang, Zizhen Yang, Hui Li, Bei Liu, Kaiwei Chen, Zhinan Wu, Xinnan Zhao, Hewei Liang, Mengmeng Wang, Xiaofang Li, Yiyi Zhong, Haifeng Zhang, Liang Xiao, Karsten Kristiansen, Jixing Peng, Yuanqiang Zou, Shangyong Li   +17 more
wiley   +1 more source

KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering, and galaxy-galaxy lensing

Astronomy & Astrophysics, 2023
We present constraints on the flat Λ cold dark matter cosmological model through a joint analysis of galaxy abundance, galaxy clustering, and galaxy-galaxy lensing observables with the Kilo-Degree Survey. Our theoretical model combines a flexible conditional stellar mass function, which describes the galaxy-halo connection, with a cosmological N-body ...
Andrej Dvornik, Catherine Heymans, Marika Asgari, Constance Mahony, Benjamin Joachimi, Maciej Bilicki, Elisa Chisari, Hendrik Hildebrandt, Henk Hoekstra, Harry Johnston, Konrad Kuijken, Alexander Mead, Hironao Miyatake, Takahiro Nishimichi, Robert Reischke, Sandra Unruh, Angus H. Wright   +16 more
openaire   +7 more sources

Subsystems of the Galactic halo, their structures and compositions

Odessa Astronomical Publications, 2017
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy.
V. A. Marsakov, T. V. Borkova
doaj   +1 more source

Substituent‐Based Modulation of Self‐Assembly and Immunogenicity of Amphipathic Peptides

Advanced Science, EarlyView.
This study systematically investigates how positional and subtle changes, such as substituents on the phenyl ring attached to short amphipathic peptides, influence their self‐assembly, fibril morphology, and immunogenic responses. ABSTRACT Self‐assembled peptide‐based biomaterials provide versatile platforms for biomedical uses, featuring customizable ...
Anirban Das, Ushasi Pramanik, Elise M. Brown, Chih‐Yun Liu, Huan Gong, Jonathan Fascetti, Mark Gibson, Samuel Stealey, Silviya P. Zustiak, Cory Berkland, Piyoosh Sharma, Meredith E. Jackrel, Mark A. White, Jai S. Rudra   +13 more
wiley   +1 more source

Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon

The Astrophysical Journal
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Ly α Emission at Reionization survey with stellar mass $8.5\lt ...
Yingjie Cheng, Mauro Giavalisco, Raymond C. Simons, Zhiyuan Ji, Darren Stroupe, Nikko J. Cleri   +5 more
doaj   +1 more source