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in subjects: "Correlation Functions"  
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Measuring the Mean and Scatter of the X-ray Luminosity -- Optical Richness Relation for maxBCG Galaxy Clusters

Description: We interpret and model the statistical weak lensing measurements around 130,000 groups and clusters of galaxies in the Sloan Digital Sky Survey presented by Sheldon et al. (2007). We present non-parametric inversions of the 2D shear profiles to the mean 3D cluster density and mass profiles in bins of both optical richness and cluster i-band luminosity. Since the mean cluster density profile is proportional to the cluster-mass correlation function, the mean profile is spherically symmetric by th… more
Date: October 2, 2007
Creator: Rykoff, E. S.; McKay, T. A.; Becker, M. A.; Evrard, A.; Johnston, D. E.; Koester, B. P. et al.
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Partner: UNT Libraries Government Documents Department
open access

Production and characterization of x-ray speckle at sector 8 of the Advanced Photon Source.

Description: The authors have implemented in the undulator first-optics enclosure of the Massachusetts Institute of Technology-McGill University-IBM Corporation Collaborative Access Team Sector at the Advanced Photon Source an x-ray beamline and a spectrometer optimized for performing small-angle, wide-bandpass, coherent-x-ray-scattering experiments. They describe the novel features of this set-up. The performance of the beamline and the spectrometer has been characterized by measuring static x-ray speckle … more
Date: June 2, 1998
Creator: Lurio, L. B.; Malik, A.; Mochrie, S. G.; Sandy, A. R.; Stephenson, G. B. & Sutton, M.
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Partner: UNT Libraries Government Documents Department
open access

Multiple parton scattering in nuclei: Twist-four nuclear matrix elements and off-forward parton distributions

Description: Multiple parton scatterings inside a large nucleus generally involve higher-twist nuclear parton matrix elements. The gluon bremsstrahlung induced by multiple scattering depends not only on direct parton matrix elements but also on momentum-crossed ones, due to the Landau-Pomeranchuk-Midgal interference effect. They show that both types of twist-four nuclear parton matrix elements can be factorized approximately into the product of twist-two nucleon matrix elements in the limit of extremely lar… more
Date: April 2, 2002
Creator: Osborne, Jonathan & Wang, Xin-Nian
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Partner: UNT Libraries Government Documents Department
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