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56 papers · 2 filters
Big Bang nucleosynthesis and the baryonic content of the universe
T. X. Thuan, Y. I. Izotov
A review of the latest measurements of the primordial abundances of the light nuclei D, 3He, 4He and 7Li is given. We discuss in particular the primordial abundance Yp of 4He as me…
New Perspectives on Cooling Flows and Cluster Radio Sources
B. R. McNamara, M. W. Wise, L. P. David +2
We discuss new results from the Chandra X-ray Observatory and XMM-Newton on cluster cooling flows, emphasizing early results from our Chandra programs. We find cooling rates reduce…
Precise Masses for Wolf 1062 AB from Hubble Space Telescope Interferometric Astrometry and McDonald Observatory Radial Velocities
G. F. Benedict, B. E. McArthur, O. G. Franz +17
We present an analysis of astrometric data from FGS 3, a white-light interferometer on {\it HST}, and of radial velocity data from two ground-based campaigns. We model the astromet…
Diffuse Gas and LMXBs in the Chandra Observation of the S0 Galaxy NGC 1553
E. L. Blanton, C. L. Sarazin, J. A. Irwin
We have spatially and spectrally resolved the sources of X-ray emission from the X-ray faint S0 galaxy NGC 1553 using an observation from the Chandra X-ray Observatory. The majorit…
Global MHD Simulations of Cylindrical Keplerian Disks
John F. Hawley
This paper presents a series of global three dimensional accretion disk simulations carried out in the cylindrical limit in which the vertical component of the gravitational field…
VLA HI Line Observations of the Extremely Metal-Poor Blue Compact Dwarf Galaxy SBS 0335-052
S. A. Pustilnik, E. Brinks, T. X. Thuan +2
We present the results of HI mapping with the NRAO VLA of one of the most metal-deficient blue compact dwarf (BCD) galaxies known, SBS 0335-052, with an oxygen abundance of only 1/…