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7 papers · 1 filter
The dynamics of planetary nebulae in the Galaxy: evidence for a third integral
S. Durand, H. Dejonghe, A. Acker
We present a dynamical analysis of 673 galactic Planetary Nebulae, using a two-integral axisymmetric model with a Kuzmin-Kutuzov Stäckel potential. The method fits the kinematics t…
The Sunyaev-Zel'dovich Effect and the Value of Omega
D. Barbosa, J. G. Bartlett, A. Blanchard +1
We consider the Sunyaev-Zel'dovich (SZ) effect as a probe of Omega_o: Using a self-consistent modeling of X-ray clusters, we examine the dependence of both the mean Compton y param…
Structure and kinematical properties of the Galaxy at intermediate galactic latitudes
Devendra Ojha, Olivier Bienayme, Annie Robin +2
We have carried out a sample survey in UBVR photometry and proper motions in different directions in the Galaxy, as part of an investigation of galactic structure and evolution. Th…
On the Uncertainty in X-Ray Cluster Mass Estimates
C. Balland, A. Blanchard
We study the uncertainty in galaxy cluster mass estimates derived from X-ray data assuming hydrostatic equilibrium (HE) for the intra cluster gas. Using a Monte-Carlo procedure we…
Probing the halo of Centaurus A: a merger dynamical model for the PN population
A. Mathieu, H. Dejonghe, X. Hui
Photometry and kinematics of the giant elliptical galaxy NGC~5128 (Centaurus~A) based on planetary nebulae observations (Hui~\etal 1995) are used to build dynamical models which al…
The Physical State of the Intergalactic Medium or Can We Measure Y?
J. G. Bartlett, D. Barbosa, A. Blanchard
We present an argument for a {\it lower limit} to the Compton- parameter describing spectral distortions of the cosmic microwave background (CMB). The absence of a detectable Gu…