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Periodic Solutions for Some Second Order Hamiltonian Systems
Second order Hamiltonian systems Periodic solutions Saddle point theorems
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2011/9/25
We use saddle point theorems of Benci-Rabinowitz and Silva to study the existence of periodic solutions with a fixed energy for a few second order Hamiltonian conservative systems without any symmetry...
New Periodic Solutions for Planar 5–Body and 7-Body Problems
5-body and 7-body problems winding numbers variational minimizers
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2011/9/25
For planar Newtonian N + 2-body (N=3,5)problems with some mass ratios, we prove the existence of new non-collision periodic solutions such that N bodies with equal masses move on one loop and the othe...
A Systematic Study on Energy Dependence of Quasi-Periodic Oscillation Frequency in GRS 1915+105
accretion, accretion disks — black hole physics — stars: individual (GRS 1915+105) — stars: oscillations
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2011/10/11
Systematically studying all the RXTE/PCA observations for GRS 1915+105 before November 2010, we have discovered three additional patterns in the relation between Quasi-Periodic Oscillation (QPO) frequ...
Quasi-Periodic Pulsations in Solar Flares: new clues from the Fermi Gamma-Ray Burst Monitor
Sun: fl ares Methods:data analysis Methods: statistical Methods:observational
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2011/10/8
In the last four decades it has been observed that solar flares show quasi-periodic pulsations (QPPs) from the lowest, i.e. radio, to the highest, i.e. gamma-ray, part of the electromagnetic spectrum....
Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
Oscillations, Solar Radio Emission Radio Bursts, Association with Flares
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2011/9/29
The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B=2000 G at the level of the chromosphere-corona transition regio...
Periodic Radio Emission from the M7 Dwarf 2MASS J13142039+1320011: Implications for the Magnetic Field Topology
Periodic Radio Emission Implications Magnetic Field Topology
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2011/9/29
We present multi-epoch radio and optical observations of the M7 dwarf 2MASS J13142039+1320011. We detect a ~1 mJy source at 1.43, 4.86, 8.46 and 22.5 GHz, making it the most luminous radio emission ov...
Interpretation of the 115 Day Periodic Modulation in the X-ray Flux of NGC 5408 X-1
the 115 Day Periodic Modulation the X-ray Flux NGC 5408 X-1
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2011/1/11
We comment on the recent observation of a 115-day modulation in the X-ray flux of the ultraluminous X-ray source (ULX) NGC 5408 X-1, and in particular, the interpretation of this modulation as the orb...
Interpretation of the 115 Day Periodic Modulation in the X-ray Flux of NGC 5408 X-1
the 115 Day Periodic Modulation the X-ray Flux NGC 5408 X-1
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2011/1/11
We comment on the recent observation of a 115-day modulation in the X-ray flux of the ultraluminous X-ray source (ULX) NGC 5408 X-1, and in particular, the interpretation of this modulation as the orb...
Absence of a Periodic Component in Quasar z-Distribution
arge-scale structure of Universe quasars general catalogues,methods data analysis
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2010/11/10
Since the discovery of quasars in papers often appeared and appear the assertions that the redshift quasar distribution includes a periodic component with the period z = 0.063 or 0.11. A statement of...
Resonant radii of kHz quasi-periodic oscillations in Keplerian discs orbiting neutron stars
High Energy Astrophysical Phenomena (astro-ph.HE)
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2010/12/28
Exchange of dominance between twin kHz quasi-periodic oscillations (QPOs) observed in some low-mass-X-ray-binaries (LMXB) suggests the possibility of a resonance between two oscillatory modes.
Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. III. Quasi-Periodic Variability
High Energy Astrophysical Phenomena (astro-ph.HE) General Relativity and Quantum Cosmology (gr-qc)
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2010/12/24
According to the no-hair theorem, astrophysical black holes are uniquely described by their masses and spins. An observational test of the no-hair theorem can be performed by measuring at least three ...
Disk instabilities and Quasi-Periodic Oscillations
Disk instabilities Quasi-Periodic Oscillations
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2009/7/1
Disk instabilities and Quasi-Periodic Oscillations。
Mass loss from Luminous Blue Variables and Quasi-periodic Modulations of Radio Supernovae
Mass loss Quasi-periodic Modulations Luminous Blue Variables Radio Supernovae
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2009/6/30
Mass loss from Luminous Blue Variables and Quasi-periodic Modulations of Radio Supernovae。
Electric discharges onto a black hole and x-ray transient periodic variability in agn
agn black hole Electric discharges x-ray
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2009/6/5
Electric discharges onto a black hole and x-ray transient periodic variability in agn。
Variable Quasi Periodic Oscillations during an Outburst of the Transient X-ray Pulsar XTE J1858+034
Stars pulsar individual (XTE J1858+034) X-rays pulsar
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2010/9/17
We have investigated the Quasi Periodic Oscillation (QPO)properties of the transient accreting X-ray pulsar XTE J1858 + 034 during the second outburst of this source in April–May 2004. We have used ob...