327 citations · 2.2k across the 21 of their papers we have counts for
21 papers · 1 filter
Filaments and Pancakes in the IRAS 1.2 Jy Redshift Catalogue
B. S. Sathyaprakash, Varun Sahni, Sergei F. Shandarin +1
We explore shapes of clusters and superclusters in the IRAS 1.2 Jy redshift survey with three reconstructions spanning the range β= 0.1, 0.5, 1.0, where β= Ω^{0.6}/b, b is the bias…
Skewed exponential pairwise velocities from Gaussian initial conditions
Roman Juszkiewicz, Karl B. Fisher, Istvan Szapudi
Using an Eulerian perturbative calculation, we show that the distribution of relative pairwise velocities which arises from gravitational instability of Gaussian density fluctuatio…
Redshift-Space Distortions and the Real-Space Clustering of Different Galaxy Types
Luigi Guzzo, Michael A. Strauss, Karl B. Fisher +2
We study the distortions induced by peculiar velocities on the redshift-space correlation function of galaxies of different morphological types in the Pisces-Perseus redshift surve…
Wiener Reconstruction of the IRAS 1.2Jy Galaxy Redshift Survey: Cosmographical Implications
Matthew Webster, Ofer Lahav, Karl Fisher
We utilise the method of Wiener reconstruction with spherical harmonics and Bessel functions to recover the density and velocity fields from the IRAS 1.2Jy redshift survey. The res…
Percolation Analysis of a Wiener Reconstruction of the IRAS 1.2 Jy Redshift Catalog
Capp Yess, Sergei F. Shandarin, Karl B. Fisher
We present percolation analyses of Wiener Reconstructions of the IRAS 1.2 Jy Redshift Survey. There are ten reconstructions of galaxy density fields in real space spanning the rang…
The Signature of a Correlation between Cosmic Ray Sources and Large Scale Structure
Eli Waxman, Karl B. Fisher, Tsvi Piran
We analyze the anisotropy signature expected if the high energy (above eV) cosmic ray (CR) sources are extra-Galactic and trace the distribution of luminous matter on larg…
Galaxy Clustering Around Nearby Luminous Quasars
Karl B. Fisher, John N. Bahcall, Sofia Kirhakos +1
We examine the clustering of galaxies around a sample of 20 luminous low redshift (z<0.30) quasars observed with the Wide Field Camera-2 on the Hubble Space Telescope. The HST reso…
The Nonlinear Redshift Space Power Spectrum: Omega from Redshift Surveys
K. B. Fisher, A. Nusser
We examine the anisotropies in the power spectrum by the mapping of real to redshift space. Using the Zel'dovich approximation, we obtain an analytic expression for the nonlinear r…
What is the Small-Scale Velocity Dispersion of Galaxy Pairs?
L. Guzzo, K. B. Fisher, M. S. Strauss +2
We present some new results from an ongoing investigation of the anisotropy of the two--point correlation function for optically selected galaxies. We have estimated xi(r_p,pi) fro…
The IRAS 1.2 Jy Survey: Redshift Data
Karl Fisher, John Huchra, Michael Strauss +3
We present the redshift data for a survey of galaxies selected from the data base of the Infrared Astronomical Satellite (IRAS). This survey extends the 1.936 Jy sample of Strauss…
On The Validity of the Streaming Model for the Redshift-Space Correlation Function in the Linear Regime
Karl B. Fisher
The relation between the galaxy correlation function in real and redshift-space is derived in the linear regime by an appropriate averaging of the joint probability distribution of…
Wiener Reconstruction of The Large Scale Structure
S. Zaroubi, Y. Hoffman, K. B. Fisher +1
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 i…
Wiener Reconstruction of Density, Velocity, and Potential Fields from All-Sky Galaxy Redshift Surveys
Karl Fisher, Ofer Lahav, Yehuda Hoffman +2
We present a new method for recovering the cosmological density, velocity, and potential fields from all-sky redshift catalogues. The method is based on an expansion of the fields…
Wiener Filtering of the COBE DMR Data
Emory F. Bunn, Karl B. Fisher, Yehuda Hoffman +3
We derive an optimal linear filter to suppress the noise from the COBE DMR sky maps for a given power spectrum. We then apply the filter to the first-year DMR data, after removing…
Wiener Reconstruction of Galaxy Surveys in Spherical Harmonics
O. Lahav, K. B. Fisher, Y. Hoffman +2
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 spheric…
A Spherical Harmonic Approach to Redshift Distortion: Implications for and the Power Spectrum
Karl B. Fisher
We examine the nature of galaxy clustering in redshift space using a method based on an expansion of the galaxian density field in Spherical Harmonics and linear theory. We derive…
A Spherical Harmonic Approach to Redshift Distortion and a Measurement of Omega from the 1.2 Jy IRAS Redshift Survey
Karl B. Fisher, Caleb A. Scharf, Ofer Lahav
We present a formalism for analysing redshift distortions based on a spherical harmonic expansion of the density field. We use a maximum likelihood estimator for the combination of…
Clustering in the 1.2 Jy IRAS Galaxy Redshift Survey II: Redshift Distortions and ξ(r_p,π)
Karl B Fisher, Marc Davis, Michael A Strauss +2
We examine the effect of redshift space distortions on the galaxy two-point correlation function as a function of separations parallel () and perpendicular () to…
Fourier Analysis of Redshift Space Distortions and the Determination of Omega
Shaun Cole, Karl B. Fisher, David H. Weinberg
The peculiar velocities of galaxies distort the pattern of galaxy clustering in redshift space, making the redshift space power spectrum anisotropic. In the linear regime, the stre…
Clustering in the 1.2 Jy IRAS Galaxy Redshift Survey I: The Redshift and Real Space Correlation Functions
Karl B. Fisher, Marc Davis, Michael A. Strauss +2
We present analyses of the two-point correlation function derived from an all-sky redshift survey of 5313 galaxies extracted from the Infrared Astronomical Satellite (IRAS) databas…
Moments of the Counts Distribution in the 1.2 Jy IRAS Redshift Survey
Francois R. Bouchet
We derive the volume-averaged 2, 3, 4, and 5-point correlation functions from the moments of the Count probability distribution function of a redshift survey of IRAS galaxies, and…