scholarly journals Tensor-scalar gravity and binary-pulsar experiments

1996 ◽  
Vol 54 (2) ◽  
pp. 1474-1491 ◽  
Author(s):  
Thibault Damour ◽  
Gilles Esposito-Farèse
Keyword(s):  
Binary Pulsar ◽  
Scalar Gravity

scholarly journals Aperiodic Flux Variability in A 0535+262

1996 ◽  
Vol 165 ◽  
pp. 313-319
Author(s):  
Mark H. Finger ◽  
Robert B. Wilson ◽  
B. Alan Harmon ◽  
William S. Paciesas
Keyword(s):  
Neutron Star ◽  
Gamma Ray ◽  
Beat Frequency ◽  
Power Spectra ◽  
Center Frequency ◽  
X Ray ◽  
Binary Pulsar ◽  
Transient Source ◽  
Flux Variability ◽  
Burst And Transient Source

A “giant” outburst of A 0535+262, a transient X-ray binary pulsar, was observed in 1994 February and March with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory. During the outburst power spectra of the hard X-ray flux contained a QPO-like component with a FWHM of approximately 50% of its center frequency. Over the course of the outburst the center frequency rose smoothly from 35 mHz to 70 mHz and then fell to below 40 mHz. We compare this QPO frequency with the neutron star spin-up rate, and discuss the observed correlation in terms of the beat frequency and Keplerian frequency QPO models in conjunction with the Ghosh-Lamb accretion torque model.

scholarly journals Conformal symmetry, anomaly and effective action for metric-scalar gravity with torsion

2000 ◽  
Vol 479 (4) ◽  
pp. 411-420 ◽  
Author(s):  
J.A. Helayel-Neto ◽  
A. Penna-Firme ◽  
I.L. Shapiro
Keyword(s):  
Effective Action ◽  
Conformal Symmetry ◽  
Scalar Gravity

scholarly journals A HIGHLY ECCENTRIC 3.9 MILLISECOND BINARY PULSAR IN THE GLOBULAR CLUSTER NGC 6652

2015 ◽  
Vol 807 (2) ◽  
pp. L23 ◽  
Author(s):  
Megan E. DeCesar ◽  
Scott M. Ransom ◽  
David L. Kaplan ◽  
Paul S. Ray ◽  
Aaron M. Geller
Keyword(s):  
Globular Cluster ◽  
Binary Pulsar

Accurate Mass Ratio and Heating Effects in the Dual-Line Millisecond Binary Pulsar in NGC 6397

2003 ◽  
Vol 584 (1) ◽  
pp. L13-L16 ◽  
Author(s):  
F. R. Ferraro ◽  
E. Sabbi ◽  
R. Gratton ◽  
A. Possenti ◽  
N. D’Amico ◽  
...  
Keyword(s):  
Accurate Mass ◽  
Mass Ratio ◽  
Binary Pulsar ◽  
Heating Effects

scholarly journals Gravitational radiation and the binary pulsar

Nature ◽  
1982 ◽  
Vol 297 (5865) ◽  
pp. 357-358 ◽  
Author(s):  
Virginia Trimble
Keyword(s):  
Gravitational Radiation ◽  
Binary Pulsar

scholarly journals A Model for the Binary Pulsar Radio Eclipse

2000 ◽  
Vol 177 ◽  
pp. 535-536
Author(s):  
D. Khechinashvili ◽  
G. Melikidze ◽  
J. Gil
Keyword(s):  
Cyclotron Resonance ◽  
White Dwarfs ◽  
Radio Waves ◽  
Frequency Dependent ◽  
Pulsar Radio ◽  
Binary Pulsar ◽  
Pulsar Wind ◽  
Relativistic Particles ◽  
Strongly Damped

AbstractWe suggest that companions of two binary eclipsing pulsars, B1957+20 and J2051-0827, are degenerate magnetic dwarfs. The magnetospheres of the white dwarfs are infused with relativistic particles supplied by the pulsar wind. We demonstrate that the radio waves emitted by the pulsars are strongly damped due to cyclotron resonance with the plasma particles, in the magnetospheres of companions. Large stable continuos and frequency-dependent radio eclipses should occur as a result of this process. This agrees well with observations.

BINARY PULSAR SYSTEM PSR B1259-63/LS2883 AS A GAMMA-RAY EMITTER

2014 ◽  
Vol 28 ◽  
pp. 1460169 ◽  
Author(s):  
DMITRY KHANGULYAN ◽  
SERGEY V. BOGOVALOV ◽  
FELIX A. AHARONIAN
Keyword(s):  
Energy Band ◽  
Gamma Ray ◽  
High Energy ◽  
Energy Losses ◽  
Binary Pulsar ◽  
Emission Component ◽  
Emission Enhancement ◽  
Very High Energy ◽  
Hydrodynamical Simulations ◽  
Very High

Observations of the binary pulsar PSR B1259-63/LS2883 in the high energy and very high energy domains have revealed a few quite unusual features. One of the most puzzling phenomena is the bright GeV flare detected with Fermi/LAT in 2011 January, approximately one month after periastron passage. Since the maximum luminosity in the high energy band during the flare nearly achieved the level of the pulsar spin-down energy losses, it is likely that the particles, responsible for this emission component, had a strongly anisotropic distribution, which resulted in the emission enhancement. One of the most prolific scenarios for such an emission enhancement is the Doppler boosting, which is realized in sources with relativistic motions. Interestingly, a number of hydrodynamical simulations have predicted a formation of highly relativistic outflows in binary pulsar systems, therefore scenarios, involving relativistic boosting, are very natural for these systems. However a more detailed analysis of such a possibility, presented in this study, reveals certain limitations which put strict constraints on the maximum luminosity achievable in this scenario. These constraints render the "Doppler boosting" scenario to be less feasible, especially for the synchrotron models.

scholarly journals The High Time Resolution Universe Pulsar Survey – XIII. PSR J1757−1854, the most accelerated binary pulsar

2018 ◽  
Vol 475 (1) ◽  
pp. L57-L61 ◽  
Author(s):  
A D Cameron ◽  
D J Champion ◽  
M Kramer ◽  
M Bailes ◽  
E D Barr ◽  
...  
Keyword(s):  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Binary Pulsar
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