Now showing items 151-156 of 156
An amplifier-discriminator module for very high energy [gamma]-ray astronomy
(Elsevier, 1990-07-15)
An eight-channel amplifier-discriminator module has been developed for processing fast photomultiplier signals from a ground-based [gamma]-ray imaging telescope. The module provides several outputs for recording pulse ...
The C4 clustering algorithm: clusters of galaxies in the Sloan Digital Sky Survey
(Univ Chicago Press, 2005-09)
We present the C4 Cluster Catalog, a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Survey (SDSS). The C4 cluster-finding algorithm ...
The X-ray luminosity-mass relation for local clusters of galaxies
(Univ Chicago Press, 2006-09-10)
We investigate the relationship between soft X-ray luminosity and mass for low-redshift clusters of galaxies by comparing observed number counts and scaling laws to halo-based expectations of Lambda CDM cosmologies. We ...
Future evolution of cosmic structure in an accelerating universe
(Univ Chicago Press, 2003-10-20)
Current cosmological data indicate that our universe contains a substantial component of dark vacuum energy that is driving the cosmos to accelerate. We examine the immediate and longer term consequences of this dark energy ...
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134
(IOP Publishing Ltd, 2004-03-07)
The first science run of the LIGO and GEO gravitational wave detectors presented the opportunity to test methods of searching for gravitational waves from known pulsars. Here we present new direct upper limits on the ...
Rho-omega interference in pp 4st AT 1.6 - 2.2 GeV/c *
(Elsevier, 1970-12-15)
The [pi]+[pi]- mass spectrum from over 3000 events of the reaction pp-->[pi]+[pi]+[pi]-[pi]- at 1.63-2.20 GeV/c shows evidence for [rho]-[omega] interference. If we allow for [rho]-background interference the evidence is ...