We report on the metal distribution in the intracluster medium around the radio galaxy 4C+55.16 (z = 0.24) observed with the Chandra X-ray Observatory. The radial metallicity profile shows a dramatic change at 10 arcsec (∼ 50 kpc) in radius from half solar to twice solar at inner radii. Also found was a plume-like feature located at∼ 3 arcsec to the south-west of the centre of the galaxy, which...

In sampling mode, S, and S, are on, the voltage across C,,tracks Vi,,, and 4 is configured as a unity-gain amplifier. In transition to the hold mode, S, and S, turn off and C,maintains a unity-gain loop around 4. In this topology, both charge injection of S, and S, and hold-mode droop appear as a common-mode voltage at the inputs of 4, allowing smaller values for C, and C , than in a single-en...

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CoKu Tau/4 has been labeled as one of the very few known transition disk objects—disks around young stars that have their inner disks cleared of dust, arguably as a result of planetary formation. We report aperture-masking interferometry and adaptive optics imaging observations showing that CoKu Tau/4 is in fact a near-equal binary star of projected separation ∼53 mas (∼8 AU). The spectral ener...

Our essay begins with explication of the notion of eigenform as pioneered by Heinz von Foerster in his papers (Foerster, 1981, pp. 258–271, pp. 274–285, pp. 288–309) and explored in papers of the author (Kauffman, 2003, pp. 73–90, 2005, pp. 129–150; 2009, pp. 121–137, 2010, pp. 48–89). In Foerster (1981, pp. 274–285) the familiar objects of our existence can be seen as tokens for the behaviors ...