Results 51 to 60 of about 561,353 (372)
Realizing normal group-velocity dispersion in free space via angular dispersion [PDF]
, 2021 It has long been thought that normal group-velocity dispersion (GVD) cannot be produced in free space via angular dispersion. Indeed, conventional diffractive or dispersive components such as gratings or prisms produce only anomalous GVD. We identify the conditions that must be fulfilled by the angular dispersion introduced into a plane-wave pulse to ...
arxiv +1 more source
Velocity Dispersion of Ionized Gas and Multiple Supernova Explosions
Open Astronomy, 2015 We use 3D numerical simulations to study the evolution of the Hα intensity and velocity dispersion for single and multiple supernova (SN) explosions. We find that the IHα– σ diagram obtained for simulated gas flows is similar in shape to that observed in
Vasiliev E. O. +2 more
doaj +1 more source
Resolved gas kinematics in a sample of low-redshift high star-formation rate galaxies [PDF]
, 2016 We have used integral field spectroscopy of a sample of six nearby (z~0.01-0.04) high star-formation rate (SFR~10-40 solar masses per year) galaxies to investigate the relationship between local velocity dispersion and star formation rate on sub-galactic scales.
arxiv +1 more source
Tracing Dark Matter Halos with Satellite Kinematics and the Central Stellar Velocity Dispersion of Galaxies [PDF]
, 2020 It has been suggested that the central stellar velocity dispersion of galaxies can trace dark matter halo mass directly. We test this hypothesis using a complete spectroscopic sample of isolated galaxies surrounded by faint satellite galaxies from the Sloan Digital Sky Survey Data Release 12.
arxiv +1 more source
The Dynamics of Dense Cores in the Perseus Molecular Cloud II: The Relationship Between Dense Cores and the Cloud [PDF]
, 2010 We utilize the extensive datasets available for the Perseus molecular cloud to analyze the relationship between the kinematics of small-scale dense cores and the larger structures in which they are embedded.
Alyssa Goodman +31 more
core +2 more sources
Self‐Similarity and the Pair Velocity Dispersion [PDF]
The Astrophysical Journal, 1997 We have considered linear two point correlations of the form $1/{x^ }$ which are known to have a self-similar behaviour in a $ =1$ universe. We investigate under what conditions the non-linear corrections, calculated using the Zel'dovich approximation, have the same self-similar behaviour.
openaire +3 more sources
Velocity and dispersion of heavy oils [PDF]
SEG Technical Program Expanded Abstracts 2008, 2008 Acoustic properties of heavy oils have been investigated based on laboratory measurement and modeling studies. Based on newly measured shear velocity data in extended low temperature, we have revealed a full spectrum of shear velocity of heavy oils as function of temperature, which we have applied to calibrate viscosity of heavy oils.
De-hua Han, M. Batzle, Jiajin Liu
openaire +1 more source
Stellar Velocity Dispersion: Linking Quiescent Galaxies to their Dark Matter Halos [PDF]
, 2018 We analyze the Illustris-1 hydrodynamical cosmological simulation to explore the stellar velocity dispersion of quiescent galaxies as an observational probe of dark matter halo velocity dispersion and mass. Stellar velocity dispersion is proportional to dark matter halo velocity dispersion for both central and satellite galaxies.
arxiv +1 more source
The Blackhole-Dark Matter Halo Connection [PDF]
, 2015 We explore the connection between the central supermassive blackholes (SMBH) in galaxies and the dark matter halo through the relation between the masses of the SMBHs and the maximum circular velocities of the host galaxies, as well as the relationship ...
Akl, Maya Abi +3 more
core +3 more sources
A stepwise emergence of evolution in the RNA world
FEBS Letters, EarlyView.How did biological evolution emerge from chemical reactions? This perspective proposes a gradual scenario of self‐organization among RNA molecules, where catalytic feedback on random mixtures plays the central role. Short oligomers cross‐ligate, and self‐assembly enables heritable variations. An event of template‐externalization marks the transition to
Philippe Nghe
wiley +1 more source