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Constraints on local primordial non-Gaussianity from large scale structure
Anze Slosar, Christopher Hirata, Uros Seljak +2
Recent work has shown that the local non-Gaussianity parameter f_NL induces a scale-dependent bias, whose amplitude is growing with scale. Here we first rederive this result within…
Correlation of CMB with large-scale structure: II. Weak lensing
Christopher M. Hirata, Shirley Ho, Nikhil Padmanabhan +2
We investigate the correlation of gravitational lensing of the cosmic microwave background (CMB) with several tracers of large-scale structure, including luminous red galaxies (LRG…
Correlation of CMB with large-scale structure: I. ISW Tomography and Cosmological Implications
Shirley Ho, Christopher M. Hirata, Nikhil Padmanabhan +2
We cross-correlate large scale structure (LSS) observations from a number of surveys with CMB anisotropies from WMAP to investigate the Integrated Sachs-Wolfe (ISW) effect as a fun…
Constraints on the merging timescale of luminous red galaxies, or, where do all the halos go?
Charlie Conroy, Shirley Ho, Martin White
In the LCDM cosmology dark matter halos grow primarily through the accretion of smaller halos. Much of the mass in a halo of 10^14Msun comes in through accretion of ~10^13Msun halo…
Luminous Red Galaxy Population in Clusters at
Shirley Ho, Yen-Ting Lin, David Spergel +1
We investigate statistical properties of LRGs in a sample of X-ray selected galaxy clusters at intermediate redshift (). The LRGs are selected based on carefully de…
Cluster Ellipticities as a Cosmological Probe
Shirley Ho, Neta Bahcall, Paul Bode
We investigate the dependence of ellipticities of clusters of galaxies on cosmological parameters using large-scale cosmological simulations. We determine cluster ellipticities out…
Cluster arc statistics
Shirley Ho, Martin White
We study the strong gravitational lensing properties of galaxy clusters obtained from N-body simulations with standard CDM cosmology. We have used the 32 most massive clusters f…
Halo asphericity and the shear 3-pt function
Shirley Ho, Martin White
We demonstrate through the use of a simple toy model that asphericity in dark matter halos has a measurable effect on the configuration dependence of the weak lensing shear 3-point…