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Investigation of High Energy Astrophysics Phenomena


The High Energy Astrophysics team of the IAG-USP has been developing several correlated projects involving the investigation of astrophysical plasma and high energy phenomena with particular emphasis to the following studies: 1) Origin, propagation, and acceleration of ultra-high energy cosmic rays (> 1019 eV) (e.g., Medina Tanco, Gouveia Dal Pino & Horvath 1997, 1998 a, b, Medina Tanco 1998a, b) 2) formation, structure, and evolution of astrophysical jets and associated phenomenology (e.g., Gouveia Dal Pino & Benz 1993, 1994- Viegas & Gouveia Dal Pino 1992; Gouveia Dal Pino & Opher 1989, 1993; Chernin, Masson, Gouveia Dal Pino & Benz 1994- Gouveia Dal Pino 1995; Gouveia Dal Pino, Birkinshaw & Benz 1996; Gouveia Dal Pino & Birkinshaw 1996; Gouveia Dal Pino & Cerqueira 1996; Cerqueira, Gouveia Dal Pino & Herant 1997; Cerqueira & Gouveia Dal Pino 1998); 3) The fractal structure of the Universe based on the COBE experiment measurements of the fluctuations of the cosmic microwave background radiation (e.g., Gouveia Dal Pino et al. 1995; 1998); 4) The investigation of compact objects in the Galaxy, particularly focusing the production of black holes, MACHOS, type la supernovae, and internal dynamics of pulsars (e.g., Custodio & Horvath 1997- Horvath 1997; Benvenuto, Horvath & Vucetich 1992; Allen & Horvath 1997; Horvath & Allen 1997; Benvenuto & Horvath 1989; Gouveia Dal Pino, Horvath & de Freitas Pacheco 1996); and 5) The search for dark matter through microlensing observations (Medina Tanco et al. 1998).The related research topics above are highlights of wide interest in the areas of plasma and high-energy astrophysics and have been investigated under a unified context. The study of questions like the large scale structure of the Universe or the formation and distribution of compact objects in the Galaxy (e.g., black holes, neutron stars, supernovae, active galactic nuclei, etc.) and their signatures over the surrounding environment (e.g., jets, ultra-high energy particles, microlensing phenomena, etc.) intend to give answers for a better comprehension of the cosmic phenomena.In the proposals above, several numerical tools have been developed for both the realization of hidro and magnetohydrodynamical simulations (items 1, 2, and 4) and image and data statistical analysis (items 1, 3, and 5).Under this context, the present project aims the solicitation of resources which could provide the most appropriate conditions for our group to effectively continue the investigations already in progress and initiate other related studies which require new tools and equipment. In particular, the upgrade of our computational equipment will make possible the continuation of the extensive program of numerical simulations and image treatment. Further, the aquisition of appropriate observational instrumentation (see details in the Plan) will provide the necessary conditions for the development of a dark matter survey program. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DAL PINO‚ E.M.G.; LAZARIAN‚ A. Production of the large scale superluminal ejections of the microquasar GRS 1915+ 105 by violent magnetic reconnection. Astronomy & Astrophysics, v. 441, n. 3, p. 845-853, 2005.

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