Radiation from early black holes - I: effects on the neutral inter-galactic medium (2008)
Ripamonti, E., Mapelli, M., Zaroubi, S.
In the pre-reionization Universe, the regions of the inter-galactic medium (IGM) which are far from luminous sources are the last to undergo reionization. Until then, they should be scarcely affected...
Foreground simulations for the LOFAR–epoch of reionization experiment (2008)
Jelic, V., Zaroubi, S., Labropoulos, P., Thomas, R. M., Bernardi, G., Brentjens, M. A., ...
On the 3 dimensional structure of edge-on disk galaxies (2007)
Abstract: A simple algorithm is employed to deproject the two dimensional images of a pilot sample of 12 high-quality images of edge-on disk galaxies and to study their intrinsic 3 dimensional...
On the 3 dimensional structure of edge-on disk galaxies (2007)
Pohlen, M., Zaroubi, S., Peletier, R. F.
A simple algorithm is employed to deproject the two dimensional images of a pilot sample of 12 high-quality images of edge-on disk galaxies and to study their intrinsic 3 dimensional stellar...
Heating of the Intergalactic Medium by Primordial Miniquasars (2006)
Silk, J., Sugiyama, N., Thomas, R. M., Zaroubi, S.
Abstract: A simple analytical model is used to calculate the X-ray heating of the IGM for a range of black hole masses. This process is efficient enough to decouple the spin temperature of the...
The matter power spectrum from the Lyman-alpha forest: an optical depth estimate (2005)
Zaroubi, S., Viel, M., Nusser, A., Haehnelt, M.
We measure the matter power spectrum from the Lyman-alpha forest of 31 quasar spectra spanning the redshift range of 1.6-3.6. The optical depth, $\tau$, for absorption of the intergalactic medium is...
The 2dF Galaxy Redshift Survey: Wiener reconstruction of the cosmic web (2003)
Erdogdu, P, Lahav, O, Zaroubi, S, Efstathiou, G, Moody, S, Peacock, JA, ...
Constraints on reionization from the thermal history of the intergalactic medium. (2002)
Theuns, T., Schaye, J., Zaroubi, S., Kim, T-S., Tzanavaris, P., Carswell, B.
The temperature of the diffuse, photoheated intergalactic medium (IGM) depends on its reionization history because the thermal timescales are long. The widths of the hydrogen Lya absorption lines...
Consistent beta values from density-density and velocity- velocity comparisons (2002)
Zaroubi, S., Branchini, E., Hoffman, Y., Da Costa, L. N.
We apply a new algorithm, called the unbiased minimal variance (hereafter UMV) estimator, to reconstruct the cosmic density and peculiar velocity fields in our local Universe from the SEcat catalogue...
Unbiased reconstruction of the large-scale structure (2002)
We present a new unbiased minimal variance (UMV) estimator for the purpose of reconstructing the large-scale structure of the Universe from noisy, sparse and incomplete data. Similar to the Wiener...
Constraints on reionization from the thermal history of the intergalactic medium (2002)
Theuns, T., Schaye, J., Zaroubi, S., Kim, T. S., Tzanavaris, P., Carswell, B.
The temperature of the diffuse, photoheated intergalactic medium (IGM) depends on its reionization history because the thermal timescales are long. The widths of the hydrogen Lyalpha absorption lines...
Temperature fluctuations in the intergalactic medium (2002)
Theuns, T., Zaroubi, S., Kim, T. S., Tzanavaris, P., Carswell, R. F.
The temperature of the low-density intergalactic medium (IGM) is set by the balance between adiabatic cooling resulting from the expansion of the Universe, and photoheating by the ultraviolet (UV)...
Zaroubi, S, Squires, G, De Gasperis, G, Evrard, AE, Hoffman, Y, Silk, J
A general method of deprojecting two-dimensional images to reconstruct the three-dimensional structure of the projected object (specifically, X-ray, Sunyaev-Zeldovich [SZ], and gravitational lensing...
The Large-Scale Tidal Velocity Field (2001)
Hoffman, Y., Eldar, A., Zaroubi, S., Dekel, A.
We present a method for decomposing the cosmological velocity field in a given volume into its divergent component due to the density fluctuations inside the volume, and its tidal component due to...
Zaroubi, S., Squires, G., De Gasperis, G., Evrard, A., Hoffman, Y., Silk, J.
A general method of deprojecting two-dimensional images to reconstruct the three dimensional structure of the projected object --specifically X-ray, Sunyaev-Zel'dovich (SZ) and gravitational lensing...
Large-Scale Power Spectrum and Structures From the ENEAR galaxy Peculiar Velocity Catalog (2000)
Zaroubi, S., Bernardi, M., Da Costa, L. N., Hoffman, Y., Alonso, V., Wegner, G., ...
We estimate the mass density fluctuations power spectrum (PS) on large scales by applying a maximum likelihood technique to the peculiarvelocity data of the recently completed redshift-distance...
Redshift-Distance Survey of Early-Type Galaxies. IV. Dipoles of the Velocity Field (1999)
Da Costa, L. N., Bernardi, M., Alonso, M. V., Wegner, G., Willmer, C. N. A., Pellegrini, P. S., ...
We use the recently completed redshift-distance survey of nearby early-type galaxies (ENEAR) to measure the dipole component of the peculiar velocity field to a depth of cz ~ 6000 km/s. The sample...
On the Non-Gaussianity Observed in the COBE-DMR Sky Maps (1999)
Banday, A. J., Zaroubi, S., Gorski, K. M.
In this paper we pursue the origin of the non-Gaussianity determined by a bispectrum analysis of the COBE-DMR 4-year sky maps. The robustness of the statistic is demonstrated by the rebinning of the...
Secondary Infall: Theory Versus Simulations (1998)
The applicability of the highly idealized secondary infall model to `realistic' initial conditions is investigated. The collapse of proto-halos seeded by 3# density perturbations to an Einstein--de...
Deprojection of Rich Cluster Images (1998)
Zaroubi, S., Squires, G., Hoffman, Y., Silk, J.
We consider a general method of deprojecting 2D images to reconstruct the 3D structure of the projected object, assuming axial symmetry. The method consists of the application of the Fourier Slice...
Large Scale Power Spectrum from Peculiar Velocities Via Likelihood Analysis (1996)
Zaroubi, S., Zehavi, I., Dekel, A., Hoffman, Y., Kolatt, T.
The power spectrum (PS) of mass density fluctuations, independent of `biasing', is estimated from the Mark III catalog of peculiar velocities using Bayesian statistics. A parametric model is assumed...
From Local Velocities to Microwave Background (1996)
Zaroubi, S., Sugiyama, N., Silk, J., Hoffman, Y., Dekel, A.
The mass density field as extracted from peculiar velocities in our cosmological neighborhood is mapped back in time to the CMB in two ways. First, the density power spectrum ($P_k$) is translated...
Large Scale Power Spectrum from Peculiar Velocities Via Likelihood Analysis (1996)
Zaroubi, S., Dekel, A., Hoffman, Y., Kolatt, T.
The power spectrum (PS) of {\it mass} density fluctuations, independent of ``biasing", is estimated from the Mark3 Catalog of Peculiar Velocities of galaxies using Bayesian statistics. A parametric...
Wiener Reconstruction of The Large Scale Structure (1994)
Zaroubi, S., Hoffman, Y., Fisher, K. B., Lahav, O.
The formalism of Wiener filtering is developed here for the purpose of reconstructing the large scale structure of the universe from noisy, sparse and incomplete data. The method is based on a linear...
Wiener Reconstruction of Galaxy Surveys in Spherical Harmonics (1993)
Lahav, O., Fisher, K. B., Hoffman, Y., Scharf, C. A., Zaroubi, S.
The analysis of whole-sky galaxy surveys commonly suffers from the problems of shot-noise and incomplete sky coverage (e.g. at the Zone of Avoidance). The orthogonal set of spherical harmonics is...