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تعداد نتایج: 1384 فیلتر نتایج به سال:
We show that the 1996 outburst of the X-ray binary transient system GRO J1655–40 can be explained by the standard dwarf-nova type disc instability, followed by an episode of enhanced mass transfer from the secondary if the mass transfer rate in GRO J1655–40 is within a factor ∼ < 10 of the stability limit. We argue that irradiation of the secondary during the onset of the outburst driven by the...
We present observational evidence for “propeller” effects in two X–ray pulsars, GX 1+4 and GRO J1744–28. Both sources were monitored regularly by the Rossi X–ray Timing Explorer (RXTE) throughout a decaying period in the X–ray brightness. Quite remarkably, strong X–ray pulsation became unmeasurable when total X–ray flux had dropped below a certain threshold. Such a phenomenon is a clear indicat...
Emerging evidence indicates that vascular endothelial growth factor (VEGF) plays a critical role in host inflammatory responses in several disease states, including atherosclerosis, sepsis, and rheumatoid arthritis. In this study, we determined the effect of VEGF on endothelial induction of proinflammatory cytokines and investigated the responsible signal pathways. By using a cytokine antibody ...
We fit X-ray spectral data in the thermal dominant or high soft state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin parameters a∗ ≡ a/M of the two holes. Our spectral model consists of one principal component, a multitemperature blackbody disk model that includes all general relativistic effects, plus standard low-energy absorption an...
X-ray observations of Galactic black holes (GBHs) such as Cygnus X-1 have greatly advanced the understanding of these objects. However, the vast majority of the observations have been restricted to energies below ∼ 200 keV. The Compton Gamma-Ray Observatory (CGRO) allowed for the first time simultaneous observations at energies from ∼ 25 keV up to > 1 GeV. In particular, the BATSE experiment ab...
Today’s artefacts, from small devices to buildings and cities, are, or are becoming, cyber-physical socio-technical systems, with tightly interwoven material and computational parts. Currently, we have to laboriously build such systems, component by component, and the results are often difficult to maintain, adapt, and reconfigure. Even “soft”ware is brittle and non-trivial to adapt and change....
We report the results of a study of the radio surroundings of the superluminal microquasar GRO J1655−40. We have searched for extended continuum structures that might be indicative of the presence of a supernova remnant (SNR) associated with the formation of the compact object in the binary system. We also carried out HI-line observations of the region looking for a local minimum created by an ...
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