Now showing items 1-10 of 48
A Morphology-Cosmology Connection for X-Ray-Clusters
(Univ Chicago Press, 1993-12-10)
We employ N-body/three-dimensional gasdynamic simulations of the formation of galaxy clusters to determine whether cluster X-ray morpholgies can be used as cosmological constraints. Confirming the analytic expectations of ...
The intracluster gas fraction in X-ray clusters: constraints on the clustered mass density
(Blackwell Science Ltd, 1997-12-01)
The mean intracluster gas fraction of X-ray clusters within their hydrostatic regions is derived from recent observational compilations of David, Jones & Forman and White & Fabian. At radii encompassing a mean density 500 ...
The L X – T relation and intracluster gas fractions of X-ray clusters
(Blackwell Science Ltd, 1999-05-21)
We re-examine the X-ray luminosity–temperature relation using a nearly homogeneous data set of 24 clusters selected for statistically accurate temperature measurements and absence of strong cooling flows. The data exhibit ...
The effects of clumping and substructure on intracluster medium mass measurements
(Univ Chicago Press, 1999-07-20)
We examine an ensemble of 48 simulated clusters to determine the effects of small-scale density fluctuations and large-scale substructure on X-ray measurements of the intracluster medium (ICM) mass. We measure rms density ...
A Re-Evaluation of the Abundance of Lutetium in the Sun
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-03)
Lutetium is one of the few nonvolatile elements whose solar photospheric abundance departs significantly from that derived from CI chondrites. We have applied the Cowan code to compute new oscillator strengths for Luii, ...
Nonlinear stationary waves and solitary waves in fluid systems with long-range forces
(Elsevier, 1993-11-15)
We study a class of nonlinear model equations which represent one-dimensional fluid systems with long range forces (such as gravity). We present elementary theorems which constrain the allowed types of stationary wave and ...
Energy levels and transition probabilities in doubly-ionized erbium (Er III)
(IOP Publishing Ltd, 1997-11-01)
The spectrum of Er III reported by Becher (1966) was reanalysed with the support of new predictions of energies and transition probabilities. The number of energy levels was increased from 45 to 115, including two levels ...
Constraints on ω 0 and cluster evolution using the ROSAT log N –log S relation
(Blackwell Science Ltd, 1998-04)