Institute of Astronomy

News and Press Releases

Hubble Goes to the eXtreme to Assemble Farthest Ever View of the Universe

Published on 25/09/2012 

Like photographers assembling a portfolio of best shots, astronomers have assembled a new, improved portrait of humanity's deepest-ever view of the universe.

Called the eXtreme Deep Field, or XDF, the photo was assembled by combining 10 years of NASA Hubble Space Telescope photographs taken of a patch of sky at the centre of the original Hubble Ultra Deep Field. The XDF is a small fraction of the angular diameter of the full Moon.

Dark Galaxies of the Early Universe Spotted for the First Time

Published on 11/07/2012 

For the first time, dark galaxies — an early phase of galaxy formation, predicted by theory but unobserved until now — may have been spotted. These objects are essentially gas-rich galaxies without stars. Using ESO’s Very Large Telescope, an international team thinks they have detected these elusive objects by observing them glowing as they are illuminated by a quasar.

UK Infrared Telescope discovers 'impossible' binary stars

Published on 04/07/2012 

UK Infrared Telescope discovers 'impossible' binary stars

A team of astronomers have used the United Kingdom Infrared Telescope (UKIRT) on Hawaii to discover four pairs of stars that orbit each other in less than 4 hours. Until now it was thought that such close-in binary stars could not exist. The new discoveries come from the telescope’s Wide Field Camera (WFCAM) Transit Survey, and appear in the journal Monthly Notices of the Royal Astronomical Society.

X-ray 'echoes' map a supermassive black hole's environs

Published on 31/05/2012 

An international team of astronomers using data from the European Space Agency's (ESA) XMM-Newton satellite has identified a long-sought X-ray "echo" that promises a new way to probe supersized black holes in distant galaxies.

Most big galaxies host a big central black hole containing millions of times the sun's mass. When matter streams toward one of these supermassive black holes, the galaxy's center lights up, emitting billions of times more energy than the sun. For years, astronomers have been monitoring such "active galactic nuclei" (AGN) to better understand what happens on the brink of a monster black hole.

Chandra Finds Fastest Wind from Stellar-Mass Black Hole

Published on 22/02/2012 

Astronomers (including members of the Institute of Astronomy) using NASA's Chandra X-ray Observatory have clocked the fastest wind blowing off a disk around a stellar-mass black hole yet discovered. This result has important implications for understanding how this type of black hole behaves.

The record-breaking wind is moving about twenty million miles per hour, or about three percent the speed of light. This is nearly ten times faster than had ever been seen from a stellar-mass black hole.