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Halo Dark Clusters of Brown Dwarfs and Molecular Clouds
The observations of microlensing events in the Large Magellanic Cloud suggest that a sizable fraction (∼ 50%) of the galactic halo is in the form of MACHOs (Massive Astrophysical Compact Halo Objects) with an average mass ∼ 0.27M⊙, assuming a standard spherical halo model. We describe a scenario in which dark clusters of MACHOs and cold molecular clouds (mainly of H2) naturally form in the halo...
متن کاملC IV Broad Absorption Line Variability in QSO Spectra from SDSS Surveys
Department of Physics, University of Naples Federico II, Napoli, Italy, 2 525 Davey Laboratory, Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA, United States, 3 Institute for Gravitation and the Cosmos, Pennsylvania State University, University Park, PA, United States, 4 104 Davey Laboratory, Department of Physics, Pennsylvania State University, Uni...
متن کاملGamma - Ray Burst 980329 and Its X - Ray Afterglow
GRB 980329 is the brightest gamma-ray burst detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. With Space Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, the Netherlands email [email protected] Istituto di Astro sica Spaziale (CNR), 00133 Rome, Italy Istituto Astronomico, Universit a Degli Studio "La Sapienza", Via Lancisi 29, 00100 Roma,...
متن کاملSharad: Radar Sounder on the 2005 Mars Reconnaissance Orbiter
Introduction: SHARAD (SHAllow RADar) is a subsurface sounding radar provided by ASI (Agenzia Spaziale Italiana) as a Facility Instrument for the 2005 Mars Reconnaissance Orbiter (MRO) mission. It is designed to characterize the upper several hundred meters of the martian subsurface. As of this writing, the instrument has been integrated into the payload on the spacecraft undergoing assembly at ...
متن کاملMeasuring astronaut performance on the ISS: advanced kinematic and kinetic instrumentation
This paper presents the design of an advanced kinematic and kinetic measurement system for the International Space Station (ISS). Massachusetts Institute of Technology (MIT), NASA, Politecnico di Milano University, and the Italian Space Agency are currently developing jointly an integrated system capable of precisely measuring the forces and moments the astronauts induce and their postures and ...
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