News tagged with active galactic nuclei

How the brightest lights in the universe 'flicker'

Active galactic nuclei are the brightest objects in the universe. They are not lit up permanently, but rather 'flicker' extremely slowly. This insight helps ETH researchers better understand the influence these nuclei and ...

dateJun 24, 2015 in Astronomy
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Exploring the cosmic X-ray background

You are likely familiar with the cosmic microwave background. This background is a thermal remnant of the big bang. Because of the expansion of the universe, this remnant energy has a temperature of about 2.7 K, which means ...

dateSep 12, 2014 in Astronomy
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DRAGNs in the sky

A radio galaxy is a galaxy that emits large amounts of radio waves. They were first discovered in the 1950s, but it wasn't until the 1960s when a technique known as aperture synthesis was developed that we could resolve the ...

dateSep 09, 2014 in Astronomy
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Dusty surprise around giant black hole

( —ESO's Very Large Telescope Interferometer has gathered the most detailed observations ever of the dust around the huge black hole at the centre of an active galaxy. Rather than finding all of the dust in a doughnut-shaped ...

dateJun 20, 2013 in Astronomy
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