Tsafrir Kolatt

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We study dark-matter halo density profiles in a high-resolution N-body simulation of a ΛCDM cosmology. Our statistical sample contains ∼ 5000 haloes in the range 1011− 1014h−1M and the resolution allows a study of subhaloes inside host haloes. The profiles are parameterized by an NFW form with two parameters, an inner radius rs and a virial radius Rvir, and(More)
We nd that Gamma-ray bursts (GRBs) at the 3B catalog are correlated (at 95% con dence level) with Abell clusters. This is the rst known correlation of GRBs with any other astronomical population. It con rms the cosmological origin of GRBs. Comparison of the rich clusters autocorrelation with the cross-correlation found here suggests that 26 15 % of an(More)
Blood oxygenation level dependence (BOLD) imaging under either hypercapnia or hyperoxia has been used to study neuronal activation and for assessment of various brain pathologies. We evaluated the benefit of a combined protocol of BOLD imaging during both hyperoxic and hypercapnic challenges (termed hemodynamic response imaging (HRI)). Nineteen healthy(More)
In this paper, we address the problem of fully automated decomposition of hyperspectral images for transmission light microscopy. The hyperspectral images are decomposed into spectrally homogeneous compounds. The resulting compounds are described by their spectral characteristics and optical density. We present the multiplicative physical model of image(More)
Eran O. Ofek, Dan Maoz, Francisco Prada, Tsafrir Kolatt, Hans-Walter Rix 1 School of Physics and Astronomy and Wise Observatory, Tel Aviv University, Tel Aviv 69978, Israel 2 Centro Astronomico Hispano-Aleman, Apdo 511, E-04080 Almeria, Spain 3 Racah Institute for Physics, The Hebrew University, Jerusalem 91904, Israel 4 Max-Planck-Institut für Astronomie,(More)
Singing is, undoubtedly, the most fundamental expression of our musical capacity, yet an estimated 10-15% of Western population sings "out-of-tune (OOT)." Previous research in children and adults suggests, albeit inconsistently, that imitating a human voice can improve pitch matching. In the present study, we focus on the potentially beneficial effects of(More)
We investigate the clustering properties of high-redshift galaxies within three competing scenarios for assigning luminous galaxies to dark matter halos from N-body simulations: a one galaxy per massive halo model, a quiescent star formation model, and a collisional starburst model. We compare these models to observations of Lyman-Break galaxies at z ∼ 3.(More)
We describe the construction of an N-body simulation that mimics the true velocity and mass-density elds in a box of side 256 h 1Mpc about the Local Group, and the production of mock catalogs that mimic in detail current catalogs of redshifts and peculiar velocities. Our main purpose is to provide a tool for developing and testing reconstruction methods,(More)