12,850 research outputs found
Confirmation of the 62 Day X-Ray Periodicity from M82
Using 400 days of new X-ray monitoring of M82, we confirm the 62 day
periodicity previously reported. In the full data set spanning 1124 days, we
find a period of 62.0 +/- 0.3 days and a coherence, Q = 22.3, that is
consistent with a strictly periodic signal. We estimate that the probability of
chance occurrence of our observed signal is 6E-7. The light curve folded at
this period is roughly sinusoidal and has a peak to peak amplitude of (0.99 +/-
0.10) x 10^-11 erg cm^-2 s^-1. Confirmation of the periodicity strengthens our
previous suggestion that the 62 day modulation is due to orbital motion within
an X-ray binary.Comment: 4 pages, to appear in Ap
Spin current through an ESR quantum dot: A real-time study
The spin transport in a strongly interacting spin-pump nano-device is studied
using the time-dependent variational-matrix-product-state (VMPS) approach. The
precession magnetic field generates a dissipationless spin current through the
quantum dot. We compute the real time spin current away from the equilibrium
condition. Both transient and stationary states are reached in the simulation.
The essentially exact results are compared with those from the Hartree-Fock
approximation (HFA). It is found that correlation effect on the physical
quantities at quasi-steady state are captured well by the HFA for small
interaction strength. However the HFA misses many features in the real time
dynamics. Results reported here may shed light on the understanding of the
ultra-fast processes as well as the interplay of the non-equilibrium and
strongly correlated effect in the transport properties.Comment: 5 pages, 5 figure
Parenting Programs for Disruptive Child Behavior in China: A Meta-Analysis and Systematic Review
Parenting Programs for Disruptive Child Behavior in China: A Meta-Analysis and Systematic Review
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