Some of the structure can be seen in the old ROSAT maps from the 90s: http://www.xray.mpe.mpg.de/rosat/survey/sxrb/12/ass.html http://www.xray.mpe.mpg.de/rosat/

Some of the structure can be seen in the old ROSAT maps from the 90s: http://www.xray.mpe.mpg.de/rosat/survey/sxrb/12/ass.html http://www.xray.mpe.mpg.de/rosat/survey/sxrb/12/ass.html Recently XMM looked at the centre of the galaxy, finding chimney-like structures which may link to the bubbles. This is on a much smaller region, however: http://www.esa.int/Science_Exploration/Space_Science/Giant_chimneys_vent_X-rays_from_Milky_Way_s_core http://www.esa.int/Science_Exploration/Space_Science/Giant_c... Nothing since ROSAT has had the ability to map large areas like eROSITA/SRG. ABRIXAS was supposed to be the successor to ROSAT, but it failed shortly after launch.