scholarly journals New code for equilibriums and quasiequilibrium initial data of compact objects. IV. Rotating relativistic stars with mixed poloidal and toroidal magnetic fields

2019 ◽  
Vol 100 (12) ◽  
Author(s):  
Kōji Uryū ◽  
Shijun Yoshida ◽  
Eric Gourgoulhon ◽  
Charalampos Markakis ◽  
Kotaro Fujisawa ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Initial Data ◽  
Compact Objects ◽  
Relativistic Stars

scholarly journals Central compact objects and their magnetic fields

2012 ◽  
Vol 8 (S291) ◽  
pp. 101-106 ◽  
Author(s):  
Wynn C. G. Ho
Keyword(s):  
Magnetic Fields ◽  
Neutron Stars ◽  
Supernova Remnants ◽  
Compact Objects ◽  
Spectral Measurements ◽  
X Ray ◽  
Surface Field ◽  
Weak Surface ◽  
Central Compact Objects ◽  
Weak Fields

AbstractCentral compact objects (CCOs) are neutron stars that are found near the center of supernova remnants, and their association with supernova remnants indicates these neutron stars are young (≲ 104 yr). Here we review the observational properties of CCOs and discuss implications, especially their inferred magnetic fields. X-ray timing and spectral measurements suggest CCOs have relatively weak surface magnetic fields (~ 1010 − 1011 G). We argue that, rather than being created with intrinsically weak fields, CCOs are born with strong fields and we are only seeing a weak surface field that is transitory and evolving. This could imply that CCOs are one manifestation in a unified picture of neutron stars.

scholarly journals Off-equatorial circular orbits in magnetic fields of compact objects

2008 ◽  
Vol 4 (S259) ◽  
pp. 125-126 ◽  
Author(s):  
Zdeněk Stuchlík ◽  
Jiří Kovář ◽  
Vladimír Karas
Keyword(s):  
Black Holes ◽  
Magnetic Fields ◽  
Neutron Stars ◽  
Compact Objects ◽  
Circular Orbits ◽  
Naked Singularities ◽  
Plasma Ring

AbstractWe present results of investigation of the off-equatorial circular orbits existence in the vicinity of neutron stars, Schwarzschild black holes with plasma ring, and near Kerr-Newman black holes and naked singularities.

scholarly journals Very young neutron stars and millisecond pulsars: the role of the accretion

2012 ◽  
Vol 8 (S290) ◽  
pp. 231-232
Author(s):  
Alexander F. Kholtygin ◽  
Andrei P. Igoshev
Keyword(s):  
Magnetic Fields ◽  
Neutron Stars ◽  
Binary Systems ◽  
Compact Objects ◽  
Millisecond Pulsars ◽  
Know How ◽  
Central Compact Objects ◽  
Low Magnetic Field ◽  
Age Determinations

AbstractWe consider the evolution of the very young neutron stars (NS) with moderate and low magnetic field values around 1E8 G to know how large is the share of the these objects among the those attributed as the millisecond pulsars (MSP). To exclude the contamination of accreted NS and young NS with moderate magnetic fields we study the observational evidences of the accretion on NS in the binary systems and different methods of age determinations. It was concluded that only central compact objects are appropriate candidates for NSs with small initial magnetic fields.

scholarly journals Theory of quasi-stationary kinetic dynamos in magnetized accretion discs

2010 ◽  
Vol 6 (S274) ◽  
pp. 228-231 ◽  
Author(s):  
Claudio Cremaschini ◽  
John C. Miller ◽  
Massimo Tessarotto
Keyword(s):  
Magnetic Fields ◽  
Decisive Role ◽  
Accretion Disc ◽  
Compact Objects ◽  
Accretion Discs ◽  
Larmor Radius ◽  
Equilibrium Solutions ◽  
Temperature Anisotropy ◽  
Starting Point ◽  
Dynamo Effect

AbstractMagnetic fields are a distinctive feature of accretion disc plasmas around compact objects (i.e., black holes and neutron stars) and they play a decisive role in their dynamical evolution. A fundamental theoretical question related with this concerns investigation of the so-called gravitational MHD dynamo effect, responsible for the self-generation of magnetic fields in these systems. Experimental observations and theoretical models, based on fluid MHD descriptions of various types support the conjecture that accretion discs should be characterized by coherent and slowly time-varying magnetic fields with both poloidal and toroidal components. However, the precise origin of these magnetic structures and their interaction with the disc plasmas is currently unclear. The aim of this paper is to address this problem in the context of kinetic theory. The starting point is the investigation of a general class of Vlasov-Maxwell kinetic equilibria for axi-symmetric collisionless magnetized plasmas characterized by temperature anisotropy and mainly toroidal flow velocity. Retaining finite Larmor-radius effects in the calculation of the fluid fields, we show how these configurations are capable of sustaining both toroidal and poloidal current densities. As a result, we suggest the possible existence of a kinetic dynamo effect, which can generate a stationary toroidal magnetic field in the disc even without any net radial accretion flow. The results presented may have important implications for equilibrium solutions and stability analysis of accretion disc dynamics.

scholarly journals Nonconformally flat initial data for binary compact objects

2009 ◽  
Vol 80 (12) ◽  
Author(s):  
Kōji Uryū ◽  
François Limousin ◽  
John L. Friedman ◽  
Eric Gourgoulhon ◽  
Masaru Shibata
Keyword(s):  
Initial Data ◽  
Compact Objects

MAGNETO-PLASMA PROCESSES IN RELATIVISTIC ASTROPHYSICS: MODERN DEVELOPMENTS

2013 ◽  
Vol 22 (07) ◽  
pp. 1330016
Author(s):  
OLEG YU. TSUPKO
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Gravitational Lensing ◽  
Crucial Role ◽  
Compact Objects ◽  
Relativistic Astrophysics ◽  
Core Collapse ◽  
Core Collapse Supernova ◽  
Supernova Explosions

This contribution is a review of some talks presented at the session "Magneto-Plasma Processes in Relativistic Astrophysics" of the Thirteenth Marcel Grossmann Meeting MG13. We discuss the modern developments of relativistic astrophysics, connected with presence of plasma and magnetic fields. The influence of magneto-plasma processes on the structure of the compact objects and accretion processes is considered. We also discuss a crucial role of magnetic field for the mechanism of core-collapse supernova explosions. Gravitational lensing in plasma is also considered.

scholarly journals Construction of initial data for perturbations of relativistic stars

1999 ◽  
Vol 60 (12) ◽  
Author(s):  
Nils Andersson ◽  
Kostas D. Kokkotas ◽  
Pablo Laguna ◽  
Philippos Papadopoulos ◽  
Michael S. Sipior
Keyword(s):  
Initial Data ◽  
Relativistic Stars

scholarly journals On a Possible Influence of Magnetic Fields on the Structure of a Disk Formed During Accretion of Plasma in Binary Systems

1974 ◽  
Vol 64 ◽  
pp. 213-213
Author(s):  
L. A. Pustilnik ◽  
V. F. Shvartsman
Keyword(s):  
Magnetic Fields ◽  
Equatorial Plane ◽  
Binary Systems ◽  
Compact Objects ◽  
Disk Structure ◽  
Relativistic Particles ◽  
Lines Of Force

During accretion of plasma in binary systems containing compact objects magnetic fields are most likely to become arranged quickly, grow and fully determine the disk structure. The disk divides into separate dense clots, and a corona appears over the equatorial plane of the system. In the corona magnetic lines of force reconnect and beams of relativistic particles are generated.

Sign in / Sign up

Export Citation Format

Share Document