Results 131 to 140 of about 579,982 (342)

Stellar kinematics in the Galactic center

The Astrophysical Journal, 1989
The observations of the stellar kinematics in the central 8 pc of the Galaxy are presented. It is shown that the spectroscopy of the 2.3 microns CO absorption feature, in late type stars, yields the stellar velocity dispersion and the average stellar radial velocity as a function of galactocentric distance.
M. T. McGinn, K. Sellgren, E. E. Becklin, D. N. B. Hall   +3 more
openaire   +1 more source

Tough, Ductile, and Strong Hard‐Soft Cementitious Composite Enabled by Multi‐Material Additive Manufacturing

Advanced Materials, EarlyView.
Drawing inspiration from the layered hard‐soft architecture found in sea sponges, this work establishes a new framework for architected cementitious composites (ACC) through multi‐material additive manufacturing (MMAM) process. The integration of mortar and elastomer phases into layered architectures enables synergistic toughening mechanisms, including
Aimane Najmeddine, Shashank Gupta, William Makinen, Zayvinn Lin, Krystal Delnoce, Reza Moini   +5 more
wiley   +1 more source

Type 2 Active Galactic Nuclei with Double-Peaked [OIII] Lines. II. Single AGNs with Complex Narrow-Line Region Kinematics are More Common than Binary AGNs [PDF]

, 2011
(Abridged) Approximately 1% of low redshift ...
Civano, Comerford, Comerford, Crenshaw, Crenshaw, Das, Fischer, Fu, Gerke, Greene, Hennawi, Hennawi, Hopkins, Jenny E. Greene, Kewley, Komossa, Liu, Liu, Liu, Michael A. Strauss, Myers, Peng, Persson, Rodriguez, Rosario, Rosario, Skrutskie, Smith, Tody, Veilleux, Wang, Whittle, Whittle, Xin Liu, York, Yue Shen, Zhou   +36 more
core   +2 more sources

Triply‐Twinned Metamaterials: Unraveling the Mechanics and Failure Pathways Through High‐Resolution XCT

Advanced Materials, EarlyView.
Triply‐twinned architected lattices transform deformation from bending to stretching of struts, delivering up to threefold increases in stiffness and strength across polymeric and metallic systems. High‐resolution synchrotron XCT and image‐based simulations reveal how meta‐grain architecture, defects, and AM build orientation govern failure pathways ...
David McArthur, George Maddison, Jaianth Vijayakumar, Paul Tafforeau, Kathy Christofidou, Peter David Lee, PJ Tan, Chu Lun Alex Leung   +7 more
wiley   +1 more source

A Galactic Transformation—Understanding the SMC’s Structural and Kinematic Disequilibrium

The Astrophysical Journal
The SMC is in disequilibrium. Gas line-of-sight (LOS) velocity maps show a gradient of 60–100 km s ^−1 , generally interpreted as a rotating gas disk consistent with the Tully–Fisher relation. Yet, the stars don’t show rotation.
Himansh Rathore, Gurtina Besla, Roeland P. van der Marel, Nitya Kallivayalil   +3 more
doaj   +1 more source

STELLAR KINEMATICS AND STRUCTURAL PROPERTIES OF VIRGO CLUSTER DWARF EARLY-TYPE GALAXIES FROM THE SMAKCED PROJECT. III. ANGULAR MOMENTUM AND CONSTRAINTS ON FORMATION SCENARIOS [PDF]

, 2014
We analyze the stellar kinematics of 39 dwarf early-type galaxies (dEs) in the Virgo Cluster. Based on the specific stellar angular momentum λRe and the ellipticity, we find 11 slow rotators and 28 fast rotators.
E. Toloba, P. Guhathakurta, A. Boselli, R. Peletier, E. Emsellem, T. Lisker, G. van de Ven, J. Simon, J. Falcón-Barroso, J. Adams, A. Benson, S. Boissier, M. den Brok, J. Gorgas, G. Hensler, J. Janz, E. Laurikainen, S. Paudel, A. Ryś, H. Salo   +19 more
semanticscholar   +1 more source

2D Nanomaterials Toward Function‐Ready Superlubricity in Advanced Microsystems

Advanced Materials, EarlyView.
A unified framework links structural and transformation superlubricity with microsystem functions and deployment requirements. Mechanisms, device architectures, integration strategies, AI‐guided discovery, and benchmarking protocols are connected to define function‐ready superlubricity in advanced microsystems.
Yushan Geng, Jun Yang, Yong Yang
wiley   +1 more source

A JWST/MIRI View of the Interstellar Medium in M83. I. Resolved Molecular Hydrogen Properties, Star Formation, and Feedback

The Astrophysical Journal
We present a spatially resolved (∼3 pc pixel ^−1 ) analysis of the distribution, kinematics, and excitation of warm H _2 gas in the nuclear starburst region of M83.
Logan H. Jones, Svea Hernandez, Linda J. Smith, Aditya Togi, Tanio Diaz-Santos, Alessandra Aloisi, William Blair, Alec S. Hirschauer, Leslie K. Hunt, Bethan L. James, Nimisha Kumari, Vianney Lebouteiller, Matilde Mingozzi, Lise Ramambason   +13 more
doaj   +1 more source

Beyond compactness

Astronomy & Astrophysics
Context. Ultra-compact massive galaxies (UCMGs) often exhibit elevated stellar-to-dynamical mass ratios when dynamical masses are estimated using standard virial prescriptions. This discrepancy has been interpreted as evidence for structural non-homology
Spiniello Chiara
doaj   +1 more source

Topological Point Defects in SmC* Liquid Crystals Under Mechanical Disturbance

Advanced Materials Interfaces, EarlyView.
Tangetial air jet shear inducess island formation and nucleates topological point defects in uniform SmC films. Island bounded by edge dislocation loops shrink and transform into isolated point defects under continued shear. Mechanical perturbatio provides a controllable route for defect engineering in smectric liquid crystal thin films.
Gunganist Kongklad, Vandana Molahalli, Apichart Pattanaporkratana, Nattaporn Chattham   +3 more
wiley   +1 more source