نتایج جستجو برای: power law index
تعداد نتایج: 998303 فیلتر نتایج به سال:
Multicolor photometry of the Vela pulsar (PSR B0833−45), updated by recent HST/WFPC2 observations obtained in the 555W , 675W and 814W filters, is presented. The available data provide the best characterization so far of the pulsar spectral shape, which is dominated by a flat power law continuum with spectral index α = −0.2± 0.2, consistent with the extrapolation in the optical domain of the po...
The local interstellar spectrum of cosmic ray electrons is derived by correcting the data from balloon and space measurements for the solar modulation effect. The resulting spectrum, after the renormalization of some experimental data set, can be fitted with a single power law from about 3 GeV to 2 TeV with spectral index γ = 3.42 ± 0.02. On the other hand, at low energies the measurements by C...
The thermodynamics of general relativistic systems with boundary, obeying a Hamiltonian constraint in the bulk, is argued to be determined solely by the boundary quantum dynamics, and hence by the area spectrum. Assuming, for large area of the boundary, (a) an area spectrum as determined by Non-perturbative Canonical Quantum General Relativity (NCQGR), (b) an energy spectrum that bears a power ...
As it has several features that optimize information processing, it has been proposed that criticality governs the dynamics of nervous system activity. Indications of such dynamics have been reported for a variety of in vitro and in vivo recordings, ranging from in vitro slice electrophysiology to human functional magnetic resonance imaging. However, there still remains considerable debate as t...
In this paper, we describe a newly discovered statistical property of time series data for daily price changes. We conducted quantitative investigation of the calm-time intervals of price changes for 800 companies listed in the Tokyo Stock Exchange, and for the Nikkei 225 index over a 27-year period from January 4, 1975 to December 28, 2001. A calm-time interval is defined as the interval betwe...
We present the results from the Chandra ACIS CC mode observation of an anomalous X-ray pulsar (AXP) 1E 1841-045. This is the first observation in which the pulsar spectrum in wide energy range is spatially discriminated from the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum is fitted well with power-law plus blackbody model. The spectral parameters are Γ = 2.0± 0.3, kT...
We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Γ > 5 at the very steep decay phase emission (power-law index α = 5.1, steeper than 96% of GRBs detected by Swift) and the following peculiar X-ray rebrightening. Our spectral analysis supports the hypothesis of a comoving Band spectrum with the the peak of the νFν spectrum evolving with time to lower va...
We present the results of observations of the PSR B1509?58/MSH 15?52 system in X{rays (2 ? 250 keV) by the Rossi X{ray Timing Explorer. The spectra of the peak of the pulsed component (radio phase 0:17 ? 0:53) is t by a power law of photon index 1:360:01, with no evidence of a high energy spectral break seen up to 200 keV. For the oo-pulse spectral component, the spectrum from 2 ? 250 keV is t ...
— The spectra of the majority of bursts exhibit a low-energy power law index, α, that is either a constant or becomes softer with time. However, in the burst of 30 May 1996 α becomes harder. Here we show that this behavior can be explained by a hybrid model consisting of a thermal and a non-thermal component. In this burst the power-law index of the non-thermal component changes drastically fro...
We investigate the degree sequences of geometric preferential attachment graphs in general compact metric spaces. We show that, under certain conditions on the attractiveness function, the behaviour of the degree sequence is similar to that of the preferential attachment with multiplicative fitness models investigated by Borgs et al. When the metric space is finite, the degree distribution at e...
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