Results 21 to 30 of about 475,850 (295)

A Tolman-like Compact Model with Conformal Geometry

Entropy, 2021
In this investigation, we study a model of a charged anisotropic compact star by assuming a relationship between the metric functions arising from a conformal symmetry.
Didier Kileba Matondo, Sunil D. Maharaj
doaj   +1 more source

The variability plane of accreting compact objects [PDF]

, 2007
Recently, it has been shown that soft-state black hole X-ray binaries and active galactic nuclei populate a plane in the space defined by the black hole mass, accretion rate and characteristic frequency.
Axelsson, Baptista, Barbuy, Barret, Belloni, Belloni, Belloni, Belloni, Beuermann, C. Knigge, Casares, Chapuis, Chaty, Cocchi, Cui, Dhawan, Di Salvo, E. G. Körding, Edelson, Esin, Falcke, Fender, Fender, Foellmi, Ford, Froning, Galloway, Galloway, Gierliński, Green, Greene, Hjellming, Homan, Homan, Hynes, Hynes, I. McHardy, Jonker, Jonker, Kaiser, Kalemci, Kitamoto, Knigge, Körding, Körding, Körding, Linares, Markowitz, Marsh, Massey, McClintock, McHardy, McHardy, Merloni, Migliari, Migliari, Molkov, Nowak, Orosz, Orosz, Pandel, Pottschmidt, Pratt, Psaltis, R. Fender, Ritter, S. Migliari, Shahbaz, Shaw, Sion, Sobczak, Suleimanov, T. Belloni, Thompson, Tomsick, Trudolyubov, Uttley, Uttley, Van Der Klis, Van Straaten, Vignarca, Warner, Warner, Wijnands, Wilms, Wood, Woudt, Zdziarski   +87 more
core   +3 more sources

Scaling Correlations Among Central Massive Objects and Their Host Galaxies [PDF]

, 2016
The central regions of galaxies show the presence of super massive black holes and/or very dense stellar clusters. Both such objects seem to follow similar host-galaxy correlations, suggesting that they are members of the same family of Compact Massive ...
Capuzzo-Dolcetta, Roberto, Melo, Iara Tosta e   +1 more
core   +2 more sources

On the stability of compact supermassive objects [PDF]

, 2001
Proceeded from the gravitation equations proposed by one of authors it was argued in a previous paper that there can exist supermassive compact configurations of degenerated Fermi-gas without events horizon. In the present paper we consider the stability
Kochetov, A., Verozub, L.
core   +5 more sources

COMPACT PARTITIONS ON LARGE DIMENSION TOPOLOGICAL GRAPHS

Известия Томского политехнического университета: Промышленная кибернетика, 2023
Relevance. Distributed systems containing hundreds and thousands of objects are usually built in the form of hierarchical structures. In these structures, lower-level objects are combined into subsets for connection to the corresponding centers.
Alexander V. Pogrebnoy, Andrey V. Pogrebnoy   +1 more
doaj   +1 more source

Fornax compact object survey FCOS: On the nature of Ultra Compact Dwarf galaxies

, 2004
The results of the Fornax Compact Object Survey (FCOS) are presented. The FCOS aims at investigating the nature of the Ultra Compact Dwarf galaxies (UCDs) recently discovered in the center of the Fornax cluster (Drinkwater et al. 2000).
Bekki, Bekki, Bertin, Dirsch, Djorgovski, Drinkwater, Drinkwater, Drinkwater, Drinkwater, Drinkwater, Faber, Fellhauer, Ferguson, Ferguson, Ferrarese, Gebhardt, Graham, Hilker, Hilker, Hilker, Karick, Kroupa, Kundu, Kundu, L. Infante, Lotz, M. Hilker, Maraston, Meylan, Meylan, Meylan, Meylan, Mieske, Parmentier, Platais, Quintana, S. Mieske, Stiavelli, Whitmore, Worthey   +39 more
core   +1 more source

Constraining the Cosmological Density of Compact Objects with the Long-Term Variability of Quasars [PDF]

, 2002
By comparing the results from numerical microlensing simulations to the observed long-term variability of quasars, strong upper limits on the cosmological density of compact objects in the 0.0001-1 solar mass range may in principle be imposed. Here, this
Alam, Alexander, Baker, Boyle, Burles, Canizares, Carr, Coil, Cristiani, Czerny, Dalcanton, E. Zackrisson, Hawking, Hawkins, Hawkins, Hawkins, Hook, Kayser, Lineweaver, Membrado, Mohapatra, N. Bergvall, Ostriker, Pei, Pei, Pelt, Rauch, Refsdal, Refsdal, Schneider, Shalyapin, Sheth, Tadros, Véron, Wisotzki   +34 more
core   +2 more sources

Ultra-relativistic journeys through compact astrophysical objects

Physics Letters B
It has recently been proved that, for constant density stars, there is a critical value Λ*=1 for the dimensionless density parameter Λ ≡ 4πR2ρmax of the star above which the asymptotically measured travel time Ts along a semi-circular trajectory that ...
Shahar Hod
doaj   +1 more source

Bounds on the mass and abundance of dark compact objects and black holes in dwarf spheroidal galaxy halos [PDF]

, 2007
We establish new dynamical constraints on the mass and abundance of compact objects in the halo of dwarf spheroidal galaxies. In order to preserve kinematically cold the second peak of the Ursa Minor dwarf spheroidal (UMi dSph) against gravitational ...
F. J. Sánchez-Salcedo, Goodwin S. P., Hidalgo-Gamez A. M., Irwin M., Klessen R., Lake G., Sanchez-Salcedo F. J., V. Lora   +7 more
core   +3 more sources

Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory

European Physical Journal C: Particles and Fields, 2023
In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss–Bonnet theory.
Shao-Jun Zhang
doaj   +1 more source