Results 31 to 40 of about 759 (221)

Turbulently generated magnetic fields in clusters of galaxies

The Astrophysical Journal, 1991
The typical scale and velocity of the dominant, turbulent eddies excited by the motion of galaxies in clusters are determined from basic considerations which are valid if a steady state is attained. Hydrodynamic turbulence in the intracluster plasma presumably generates magnetic fields; our estimates of the typical scale and mean strength of these ...
Itzhak Goldman, Yoel Rephaeli
openaire   +1 more source

The Next Generation Virgo Cluster Survey (NGVS). XXX. Ultra-diffuse Galaxies and Their Globular Cluster Systems [PDF]

The Astrophysical Journal, 2020
Abstract We present a study of ultra-diffuse galaxies (UDGs) in the Virgo Cluster based on deep imaging from the Next Generation Virgo Cluster Survey. Applying a new definition for the UDG class based on galaxy scaling relations, we define samples of 44 and 26 UDGs using expansive and restrictive selection criteria, respectively. Our UDG
Lim, Sungsoon, Côté, Patrick, Peng, Eric W., Ferrarese, Laura, Roediger, Joel C., Durrell, Patrick R., Mihos, J. Christopher, Wang, Kaixiang, Gwyn, S. D. J., Cuillandre, Jean-Charles, Liu, Chengze, Sánchez-Janssen, Rubén, Toloba, Elisa, Sales, Laura V., Guhathakurta, Puragra, Lançon, Ariane, Puzia, Thomas H.   +16 more
openaire   +4 more sources

The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster

The Astrophysical Journal Supplement Series, 2020
Abstract We present a study of ultracompact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg2 of u*giz imaging, we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius.
Liu, Chengze, Côté, Patrick, Peng, Eric W., Roediger, Joel, Zhang, Hongxin, Ferrarese, Laura, Sánchez-Janssen, Rubén, Guhathakurta, Puragra, Yang, Xiaohu, Jing, Yipeng, Alamo-Martinez, Karla, Blakeslee, John P., Cuilandre, Jean-Charles, Duc, Pierre-Alain, Durrell, Patrick, Gwyn, Stephen, Jordán, Andres, Ko, Youkyung, Lançon, Ariane, Lim, Sungsoon, Longobardi, Alessia, Mei, Simona, Mihos, J. Christopher, Munoz, Roberto, Powalka, Mathieu, Puzia, Thomas, Spengler, Chelsea, Toloba, Elisa, Peng, Eric, Blakeslee, John, Boselli, Alessandro   +30 more
openaire   +6 more sources

The generation of optical emission-line filaments in galaxy clusters [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
15 pages, 18 figures. Altered density values in table 1, which were a factor of 1000 too small. Also extended caption for table 1 to show the mass outflow rate.
Pope, Edward, Pittard, Julian, Hartquist, Thomas, Falle, Sam   +3 more
openaire   +2 more sources

On a Generalized Mass-Velocity Relation for Disk Galaxies and Galaxy Clusters

, 2021
We consolidate the BFJ and BTF (MVD) relations into a generalized Scaling Mass Velocity Relation applicable to both pressure-supported galaxy clusters and rotation-supported galaxies. Unlike MOND inspired relations containing a characteristic acceleration scale and its normalization factor, our proposal is dependent on observed dynamic surface mass ...
openaire   +2 more sources

Generalizing MOND to explain the missing mass in galaxy clusters [PDF]

Astronomy & Astrophysics, 2017
Modified Newtonian Dynamics (MOND) is a gravitational framework designed to explain the astronomical observations in the Universe without the inclusion of particle dark matter. Modified Newtonian Dynamics, in its current form, cannot explain the missing mass in galaxy clusters without the inclusion of some extra mass, be it in the form of neutrinos or ...
Hodson, Alistair O., Zhao, Hongsheng
openaire   +4 more sources

Testing generalized scalar-tensor theories of gravity with clusters of galaxies

Physical Review D, 2023
We test the generalized scalar-tensor theory in static systems, namely galaxy clusters. The Degenerate higher-order scalar-tensor (DHOST) theory modifies the Newtonian potential through effective Newtonian constant and $Ξ_1$ parameter in the small scale, which modifies the hydrostatic equilibrium.
Haridasu B. S., Karmakar P., De Petris M., Cardone V. F., Maoli R.   +4 more
openaire   +3 more sources

Controlling 3D Contractility via Engineered Fibrous Hydrogel Composites

Advanced Functional Materials, EarlyView.
A tunable composite contractile assembly (CCA) is developed that can permit or resist contraction without changing cell‐adhesion and density, unlike collagen whose inherent coupling of these ECM cues limits its use as a platform in contractility studies.
Karen L. Xu, Yuqi Zhang, Alysse DeFoe, Georgios Kotsaris, Brendan Stoeckl, Matthew D. Davidson, Jason A. Burdick, Robert L. Mauck   +7 more
wiley   +1 more source

Self‐Powered Flexible Triboelectric‐Gated Ion‐Gel Transistor for Neuromorphic Tactile Sensing and Human Activity Recognition

Advanced Materials, EarlyView.
A fully flexible ion‐gel‐gated graphene‐channel transistor driven by a triboelectric nanogenerator enables self‐powered tactile sensing and synaptic learning. Mimicking spike‐rate‐dependent plasticity, the device exhibits frequency‐selective potentiation and depression, supporting rate‐coded neuromorphic computation even under flex.
Hanseong Cho, Seoyeon Park, Youngmin Lee, Sejoon Lee   +3 more
wiley   +1 more source

The Next Generation Virgo Cluster Survey (NGVS). XXXII. A Search for Globular Cluster Substructures in the Virgo Galaxy Cluster Core [PDF]

The Astrophysical Journal, 2018
Abstract Substructure in globular cluster (GC) populations around large galaxies is expected in galaxy formation scenarios that involve accretion or merger events, and it has been searched for using direct associations between GCs and structure in the diffuse galaxy light, or with GC kinematics.
Mathieu Powalka, Thomas H. Puzia, Ariane Lançon, Alessia Longobardi, Eric W. Peng, Pierre-Alain Duc, Karla Alamo-Martínez, John P. Blakeslee, Patrick Côté, Jean-Charles Cuillandre, Patrick Durrell, Paul Eigenthaler, Laura Ferrarese, Puragra Guhathakurta, S. D. J. Gwyn, Patrick Hudelot, Chengze Liu, Simona Mei, Roberto P. Muñoz, Joel Roediger, Rubén Sánchez-Janssen, Elisa Toloba, Hongxin Zhang   +22 more
openaire   +5 more sources