Publications (2)10.37 Total impact

Article: Neutron tori around Kerr black holes
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ABSTRACT: Models of stationary, axisymmetric, nonselfgravitating tori around stellar mass Kerr black holes are calculated. Such objects may form as a result of a merger between two neutron stars, a neutron star and a stellar mass black hole, or a 'failed supernova' collapse of a single rapidly rotating star. We explore a large range of parameters: the black hole mass and angular momentum, the torus mass, angular momentum and entropy. Physical conditions within the tori are similar to those in young and hot neutron stars, but their topology is different, and the range of masses and energies is much larger.  [Show abstract] [Hide abstract]
ABSTRACT: We present a combination of two very different methods for numerically calculating the effects of gravitational microlensing: the backwardraytracing that results in twodimensional magnification patterns, and the parametric representation of caustic lines; they are in a way complementary to each other. The combination of these methods is much more powerful than the sum of its parts. It allows to determine the total magnification and the number of microimages as a function of source position. The mean number of microimages is calculated analytically and compared to the numerical results. The peaks in the lightcurves, as obtained from onedimensional tracks through the magnification pattern, can now be divided into two groups: those which correspond to a source crossing a caustic, and those which are due to sources passing outside cusps. We determine the frequencies of those two types of events as a function of the surface mass density, and the probability distributions of their magnitudes. We find that for low surface mass density as many as 40 percent of all events in a lightcurve are not due to caustic crossings, but rather due to passings outside cusps.
Publication Stats
19  Citations  
10.37  Total Impact Points  
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Institutions

1994

Princeton University
 Department of Astrophysical Sciences
Princeton, New Jersey, United States
