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Astronomers make the largest map of the Universe yet

22 May 2017 Astronomy Now

Astronomers with the Sloan Digital Sky Survey have created the first map of the large-scale structure of the Universe based entirely on the positions of quasars. Quasars are the incredibly bright and distant points of light powered by supermassive black holes.

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Hubble dates black hole’s last big meal

9 March 2017 Stephen Clark

For the supermassive black hole at the center of our Milky Way galaxy, it’s been a long time between dinners. NASA’s Hubble Space Telescope has found that the black hole ate its last big meal about 6 million years ago, when it consumed a large clump of infalling gas.

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Cosmic lenses support finding on faster than expected expansion of the Universe

30 January 2017 Stephen Clark

By using galaxies as giant gravitational lenses, an international group of astronomers using the Hubble Space Telescope have made an independent measurement of how fast the Universe is expanding. The newly measured expansion rate for the local Universe is consistent with earlier findings. These are, however, in intriguing disagreement with measurements of the early Universe.

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Unexpected gaseous haloes detected around distant quasars

26 October 2016 Astronomy Now

An international team of astronomers has discovered glowing gas clouds surrounding distant quasars. The new survey of these active galaxies indicates that haloes around quasars are far more common than expected. The properties of the haloes in this surprising find are also in striking disagreement with currently accepted theories of galaxy formation in the early universe.

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Discovery nearly doubles known quasars from the ancient universe

12 September 2016 Astronomy Now

Quasars are supermassive black holes that sit at the centre of enormous galaxies, accreting matter. They shine so brightly that they are among the most distant objects in the universe that we can currently study. New work from a team led by Carnegie’s Eduardo Bañados has discovered 63 new quasars from when the universe was just 7 percent of its present age.

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Earth-space telescope observations of quasar 3C 273’s hot heart

30 March 2016 Astronomy Now

Astronomers using an orbiting radio telescope in conjunction with four ground-based radio telescopes have achieved the highest resolution, or ability to discern fine detail, of any astronomical observation ever made. The researchers were surprised when their Earth-space system revealed a core temperature hotter than 10 trillion degrees for quasar 3C 273.

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A sharp-eyed future for historic Kitt Peak telescope

13 October 2015 Astronomy Now

The 2.1-metre telescope at Kitt Peak National Observatory will be transformed into the first dedicated adaptive optics (AO) observatory for astronomy. This system, named Robo-AO KP, will allow astronomers to study large numbers of astronomical objects in high resolution, spanning science from planetary to stellar, and exoplanetary to extragalactic.

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ALMA witnesses assembly of galaxies in early universe

22 July 2015 Astronomy Now

The Atacama Large Millimetre/submillimetre Array (ALMA) has been used to detect the most distant clouds of star-forming gas yet found in normal galaxies in the early universe. The new observations allow astronomers to start to see how the first galaxies were built up and how they cleared the cosmic fog during the era of reionisation.