Results 21 to 30 of about 776 (246)

Semi-analytical study on the generic degeneracy for galaxy clustering measurements [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractFrom the galaxy power spectrum in redshift space, we derive semi-analytical results on the generic degeneracy of galaxy clustering measurements. Defining the observables A = Gbσ8 and R = Gfσ8, (being G the growth function, b the bias, f the growth rate, and σ8 the amplitude of the power spectrum), we perform a Fisher matrix formalism to ...
Guarnizo, Alejandro, Amendola, Luca, Kunz, Martin, Vollmer, Adrian   +3 more
openaire   +3 more sources

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

Triazine‐Trione Thermosets with High Processability for Scaffold Applications in Bone Tissue Engineering

Advanced Healthcare Materials, EarlyView.
Novel photo‐clickable triazine‐trione thermosets can be shaped and cured under mild conditions, including room and physiological temperatures. These materials are biocompatible and support osteogenic differentiation of bone marrow–derived mesenchymal stem cells on their surface.
Åshild Johansen, Shuntaro Yamada, Daniel J. Hutchinson, Mohammed A. Yassin, Samih Mohamed‐Ahmed, Cecilie Gjerde, Michael Malkoch, Kamal Mustafa   +7 more
wiley   +1 more source

Facile Bottom‐Up Assembly of Photonic Micropatterns via Surface‐Guided Colloidal Crystallization

Advanced Materials, EarlyView.
High‐resolution photonic micropatterns with vivid structural colors are fabricated through bottom‐up assembly, guided by surface‐dependent regioselective heterogeneous nucleation and crystal growth of colloidal particles. Full‐spectrum color tunability is achieved by controlling particle size and interparticle attraction, while in situ color mixing is ...
Yongseok Jung, Sehee Yang, Sanghyuk Park, Shin‐Hyun Kim   +3 more
wiley   +1 more source