News tagged with galactic nuclei

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 ...

Dec 22, 2014
5 / 5 (3) 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 ...

Sep 12, 2014
4.9 / 5 (7) 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 ...

Sep 09, 2014
4.2 / 5 (12) 1

The dusty heart of an active galaxy

(Phys.org) —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 ...

Mar 13, 2014
4.9 / 5 (7) 4

Dusty surprise around giant black hole

(Phys.org) —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 ...

Jun 20, 2013
4.8 / 5 (13) 13 | with audio podcast

New research sheds light on black hole growth

In a new study led by University of Central Lancashire astronomer Dr. Victor Debattista, researchers are looking into the mystery of how black holes grow and evolve. For many years, astronomers surmised black ...

Feb 14, 2013
4.8 / 5 (5) 9 | with audio podcast