News tagged with black holes

Hypervariable galactic nuclei

Extreme variability in the intensity of the optical light of galaxies, by factors of two or more, is of great interest to astronomers. It can flag the presence of rare types of supernovae, for example, or spot sudden accretion ...

dateOct 31, 2016 in Astronomy
shares460 comments 7

Hotspots in an active galactic nucleus

The nucleus of a so-called "active" galaxy contains a massive black hole that is vigorously accreting material. As a result, the nucleus often ejects bipolar jets of rapidly moving charged particles that radiate brightly ...

dateOct 24, 2016 in Astronomy
shares40 comments 21

Did LIGO detect black holes or gravastars?

After the first direct detection of gravitational waves that was announced last February by the LIGO Scientific Collaboration and made news all over the world, Luciano Rezzolla (Goethe University Frankfurt, Germany) and Cecilia ...

dateOct 19, 2016 in Astronomy
shares0 comments 1