Hierarchical force calculation algorithms (e.g. Greengard 1990) provide fast, general, and reasonably accurate approximations for gravity and other inverse-square forces. They fill the gap between direct sum methods, which are accurate and general but require O(N2) operations for a complete force calculation, and field methods, which have limited generality and accuracy but require only O(N) op...

Koji Maruyama, Toshiaki Iitaka, and Franco Nori Frontier Research System, RIKEN (The Institute of Physical and Chemical Research), Wako-shi 351-0198, Japan Laboratoire d’Information Quantique and QUIC, CP 165/59, Université Libre de Bruxelles, 1050 Bruxelles, Belgium Computational Astrophysics Laboratory, RIKEN (The Institute of Physical and Chemical Research), Wako-shi 351-0198, Japan Center f...

1 Theoretical Astrophysics, California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125 [email protected] 2 Department of Astronomy and Astrophysics, KICP, & EFI, The University of Chicago, 5640 South Ellis Ave., Chicago, IL 60637 3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 4 Space Research Institute, 8432 Profsojuznaya St., GSP-7, Moscow ...

Pisin Chen and Yu-Hsiang Lin Department of Physics, National Taiwan University, Taipei 10617, Taiwan Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305, USA Graduate Institute of Astrophysics, National ...

John L. Friedman, Lee Lindblom, and Keith H. Lockitch Department of Physics, Leonard Parker Center for Gravitation, Cosmology and Astrophysics, University of Wisconsin—Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201, USA Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125, USA Center for Astrophysics and Space Sciences 0424, University of Californ...

The baseline technology is the object-oriented programming offered by IDL’s Object Graphics [3]. The interface is implemented as a graphical widget providing interactive and immersive 3-dimensional navigation capabilities. The user acts on the objects attributes through an ensemble of menus, drop lists, buttons and dialog fields. Complex objects such as isosurfaces are implemented as polygon an...

Eight years after the ADS first appeared the last decadal survey wrote: "NASA's initiative for the Astrophysics Data System has vastly increased the accessibility of the scientific literature for astronomers. NASA deserves credit for this valuable initiative and is urged to continue it." Here we summarize some of the changes concerning the ADS which have occurred in the past ten years, and we d...

We present here evidence for the existence of a citation advantage within astrophysics for papers that link to data. Using simple measures based on publication data from NASA Astrophysics Data System we find a citation advantage for papers with links to data receiving on the average significantly more citations per paper than papers without links to data. Furthermore, using INSPEC and Web of Sc...

We describe a new parallel N-body code for astrophysical simulations of systems of point masses interacting via the gravitational interaction. The code is based on a workand data sharing scheme, and is implemented within the Cray Research Corporation’s CRAFT c © programming environment. Different data distribution schemes have been adopted for bodies’ and tree’s structures. Tests performed for ...

The SAO/NASA Astrophysics Data System (ADS) grew up with and has been riding the waves of the Information Age, closely monitoring and anticipating the needs of its end-users. By now, all professional astronomers are using the ADS on a daily basis, and a substantial fraction have been using it for their entire professional career. In addition to being an indispensable tool for professional scien...