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Astronomy

Galactic rotation in real time

Nature volume 407, pages 307–309 (2000)Cite this article

On page 349 of this issue, Andrea Ghez and colleagues1 present the first measurements of the acceleration of stars orbiting the nucleus of our Galaxy. These stars are part of a dense cluster associated with the compact radio source known as Sagittarius A*, which is thought to be at the actual centre of the Milky Way. Measuring the accelerations of stars in galactic orbits (and not just their velocities) is a technical tour de force. These accelerations are enormous on a Galactic scale; at 3–6 mm s−2 they are comparable to those experienced by the Earth as it orbits the Sun. With these measurements, the authors help to identify Sagittarius A* as the supermassive black hole at the centre of the Milky Way. They also test — and provide support for — fundamental assumptions about the dynamics of the Galactic centre and our understanding of violent activity in galactic nuclei.

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Figure 1: Infrared image of the Sagittarius (Sgr) A* star cluster taken in May 1999.

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  1. Department of Astronomy University of Texas at Austin, RLM 15.308, Austin , 78712, Texas, USA

    John Kormendy

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  1. John Kormendy
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Correspondence to John Kormendy.

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Kormendy, J. Galactic rotation in real time. Nature 407, 307–309 (2000). https://doi.org/10.1038/35030274

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