Astronomers  have produced one of the best images ever of such a bubble, using LOFAR  to detect frequencies from 20 to 160 MHz. "The result is of great  importance", says Francesco de Gasperin, lead author of the study that  will be published in the journal Astronomy & Astrophysics. "It shows  the enormous potential of LOFAR, and provides compelling evidence of  the close ties between black hole, host galaxy, and their surroundings."  

The  image was made during the test-phase of LOFAR, and targeted the giant  elliptical galaxy Messier 87, at the centre of a galaxy cluster in the  constellation of Virgo. This galaxy is 2000 times more massive than our  Milky Way and hosts in its centre one of the most massive black holes  discovered so far, with a mass six billion times that of our Sun. Every  few minutes this black hole swallows an amount of matter similar to that  of the whole Earth, converting part of it into radiation and a larger  part into powerful jets of ultra-fast particles, which are responsible  for the observed radio emission.

See the website for more details: 

http://www.mpa-garching.mpg.de/mpa/institute/news_archives/news1210_bbb/news1210_bbb-en.html （SY）