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7 papers · 1 filter
Galactic Parameters from Whole Sky 2MASS Star Count
C. K. Chang, C. M. Ko, T. H. Peng
The whole sky differential star counts (DSC) with 1 degree resolution are retrieved from 2MASS online data service. Galaxy with double exponential thin and thick disks and a single…
On the energy of homogeneous cosmologies
James M. Nester, Lau Loi So, T. Vargas
An energy for the homogeneous cosmological models is presented. More specifically, using an appropriate natural prescription, we find the energy within any region with any gravitat…
Detection of GRB 060927 at z = 5.47: Implications for the Use of Gamma-Ray Bursts as Probes of the End of the Dark Ages
A. E. Ruiz-Velasco, H. Swan, E. Troja +54
We report on follow-up observations of the GRB 060927 using the ROTSE-IIIa telescope and a suite of larger aperture ground-based telescopes. An optical afterglow was detected 20 s…
Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
01 Collaboration
A measurement of the cosmic ray positron fraction e+/(e+ + e-) in the energy range of 1-30 GeV is presented. The measurement is based on data taken by the AMS-01 experiment during…
The present day mass function in the central region of the Arches cluster
Simon Portegies Zwart, Evghenii Gaburov, Hui-Chen Chen +1
We study the evolution of the mass function in young and dense star clusters by means of direct N-body simulations. Our main aim is to explain the recent observations of the relati…
Dynamic Scalar Torsion and an Oscillating Universe
Hwei-Jang Yo, James M. Nester
For the Poincare gauge theory of gravity we consider the dynamical scalar torsion mode in a cosmological context. We explore in particular the possibility of using dynamical torsio…