dec 152012
 
Anne's Picture of the Day: The Eye of Sauron

December 15, 2012 The Eye of Sauron, a spiral galaxy in Canes Venatici Image Credits: X-ray: NASA/CXC/CfA/J.Wang et al.; Optical: Isaac Newton Group of Telescopes, La Palma/Jacobus Kapteyn Telescope, Radio: NSF/NRAO/VLA The Eye of Sauron (NGC 4151) is an intermediate spiral Seyfert I galaxy of about 37,540 across, located some 43 million light years away [continue reading]

jun 012012
 
Light 'Echo' Around Supermassive Black Hole

  Astronomers studying the galaxy NGC 4151 with ESA’s XMM-Newton space observatory have detected X-rays emitted and then reflected by ionised iron atoms very close to the supermassive black hole hosted at the galaxy’s core. By measuring the time delays occurring in these ‘reverberation’ events, they were able to map the vicinity of this black [continue reading]