News tagged with 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
shares69 comments 11

Ultra-luminous X-ray sources in starburst galaxies

Ultra-luminous X-ray sources (ULXs) are point sources in the sky that are so bright in X-rays that each emits more radiation than a million suns emit at all wavelengths. ULXs are rare. Most galaxies (including our own Milky ...

dateDec 22, 2014 in Astronomy
shares0 comments 0

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
shares0 comments 0

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
shares0 comments 1

The dusty heart of an active galaxy

( —An international research team led by Konrad Tristram from the Max-Planck-Institute for Radio Astronomy in Bonn, Germany, obtained the most detailed view so far of the warm dust in the environment of a supermassive ...

dateMar 13, 2014 in Astronomy
shares0 comments 4