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19 papers · 2 filters
The Complex Broadband X-ray Spectrum of the Starburst Galaxy M82
Edward C. Moran, Matthew D. Lehnert
The broadband X-ray spectrum of the prototypical starburst galaxy M82 is very complex. At least three spectral components are required to fit the combined ROSAT and ASCA spectrum i…
Optical and infrared investigation towards the z=3.8 quasar pair PC1643+4631A&B
Richard Saunders, Joanne C. Baker, Malcolm N. Bremer +9
In a companion paper (Paper I: Jones et al. 1996) we report the discovery of a cosmic microwave background decrement, indicative of a distant cluster with mass ~10^{15} solar masse…
Detection of a CMB decrement towards the z = 3.8 quasar pair PC1643+4631A&B
Michael E. Jones, Richard Saunders, Joanne C. Baker +7
In a 15-GHz Ryle-Telescope observation of PC1643+4631 A & B, a pair of quasars at redshifts z = 3.79 and 3.83 separated by 198 arcsec on the sky, we find a decrement in the cosmic…
Simple Three-Integral Scale-Free Galaxy Models
N. W. Evans, R. M. Häfner, P. T. de Zeeuw
The Jeans equations give the second moments or stresses required to support a stellar population against the gravity field. A general solution of the Jeans equations for arbitrary…
A Nuclear Disk and massive BH in NGC 4342
Frank C. van den Bosch, Walter Jaffe
We discuss photometric and spectroscopic data of the E/S0 galaxy NGC 4342, obtained with the Hubble Space Telescope (HST). This galaxy harbors, in addition to its outer disk, a ver…
On the Uncertainties of the Central Density in Axisymmetric Galaxies due to Deprojection
Frank C. van den Bosch
The deprojection of the surface brightness of axisymmetric galaxies is indeterminate unless the galaxy is seen edge-on. In practice, this problem is often circumvented by making ad…