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The cores of most galaxies are thought to harbour supermassive black holes, which power galactic nuclei by converting the gravitational energy of accreting matter into radiation. Sagittarius A* (Sgr A*), the compact source of radio, infrared and X-ray emission at the centre of the Milky Way, is the closest example of this phenomenon, with an estimated black(More)
Approximately 10% of active galactic nuclei exhibit relativistic jets, which are powered by the accretion of matter onto supermassive black holes. Although the measured width profiles of such jets on large scales agree with theories of magnetic collimation, the predicted structure on accretion disk scales at the jet launch point has not been detected. We(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT Sagittarius A*, the ∼4 × 10 6 M black hole candidate at the Galactic(More)
A CCD transversal filter with digitally programmable taps is described. By means of on-chip digital circuitry the tap weights can he programmed to "0" or "1". Multiple filters can be constructed on a chip together with circuitry which scales and sums their outputs to produce a device with multi-level tap weights. In order to maximize the .operating speed,(More)
The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT Sagittarius A*, the ∼ 4 × 10 6 M ⊙ black hole candidate at the Galactic Center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength Very Long Baseline Interferometry (VLBI). We report on 1.3 mm(More)
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