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60 papers · 2 filters
Discriminating weak lensing from intrinsic spin correlations using the curl-gradient decomposition
Robert G. Crittenden, Priyamvada Natarajan, Ue-Li Pen +1
The distortion field defined by the ellipticities of galaxy shapes projected on the sky can be uniquely decomposed into a gradient and a curl component. If the observed ellipticiti…
Fast Algorithms and Efficient Statistics: N-point Correlation Functions
Andrew Moore, Andy Connolly, Chris Genovese +8
We present here a new algorithm for the fast computation of N-point correlation functions in large astronomical data sets. The algorithm is based on kdtrees which are decorated wit…
CMB anisotropy from spatial correlations of clusters of galaxies
Eiichiro Komatsu, Tetsu Kitayama, Alexandre Refregier +2
The SZ effect from clusters of galaxies is a dominant source of secondary CMB anisotropy in the low-redshift universe. We present analytic predictions for the CMB power spectrum fr…
Mass profiles and anisotropies of early-type galaxies
John Magorrian, David Ballantyne
We discuss the problem of using stellar kinematics of early-type galaxies to constrain the galaxies' orbital anisotropies and radial mass profiles. We demonstrate that compressing…
Terapixel Surveys for Cosmic Shear
Y. Mellier, L. van Waerbeke, M. Radovich +14
The recent detections of cosmic shear signal announced by several groups have demonstrated the feasibility of this challenging program and convinced astro- nomers of its potential…
Error estimation for the MAP experiment
S. Prunet, R. Teyssier, S. T. Scully +2
We report here the first full sky component separation and CMB power spectrum estimation using a Wiener filtering technique on simulated data from the upcoming MAP experiment, set…