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14 papers · 2 filters
Globular Clusters as Probes of the Virgo gE NGC 4472
Terry Bridges, Keith Ashman, Mike Beasley +4
We present radial velocities for 144 globular clusters around the Virgo gE NGC 4472 (M49), and ages and metallicities from co-added spectra of 131 clusters. We confirm our earlier…
Correlation of Ultra High Energy Cosmic Rays with Compact Radio Loud Quasars
Amitabh Virmani, Sibesh Bhattacharya, Pankaj Jain +3
Angular correlations of ultra-high energy cosmic rays with cosmologically distant sources may provide clues to these mysterious events. We compare cosmic ray tracks with energies a…
Constraining Cosmological Models by the Cluster Mass Function
Nurur Rahman, Sergei F. Shandarin
We present a comparison between two observational and three theoretical mass functions for eight cosmological models suggested by the data from the recently completed BOOMERANG-98…
Constraints on Galaxy Bias, Matter Density, and Primordial Non--Gausianity from the PSCz Galaxy Redshift Survey
Hume A. Feldman, Joshua A. Frieman, J. N. Fry +1
We compute the bispectrum for the \IRAS PSCz catalog and find that the galaxy distribution displays the characteristic signature of gravity. Assuming Gaussian initial conditions, w…
Dynamical Constraints on the Formation of NGC 4472 and Its Globular Clusters
Stephen E. Zepf, Michael A. Beasley, Terry J. Bridges +4
We present new radial velocities for 87 globular clusters around the elliptical galaxy NGC 4472, and combine these with our previously published data to create a data set of veloci…
The Cosmological Mass Function in the Zel'dovich Approximation
Sergei F. Shandarin
The Press-Schechter theory of the cosmological mass function and its modifications allow to constraint cosmological scenarios of the structure formation. Recently a few new models…