Cosmic bowshock

[PB666]

http://phys.org/news/2015-08-chandra-giant-collision-triggered-radio.html

This comes from the chandra space telescope. We have discussed in the past glactic black holes. These black holes absorb matter and belch plasma and x-rays from their poles that rip the gas in galaxies ejecting it into intergalactic space. A collection of radio, visible, infrared telescopes have spotted the re-energization of a electron rich gas cloud that was was produced when the bowsock created from the merging of two galactic clusters.

[UmbralRaptor]

I'm afraid I don't know enough about cluster physics (especially hot intracluster gas) to say many useful things. It is interesting that this seems to have been done entirely with archival data.

The brightest cluster galaxy (BCG) does not have an SDSS spectroscopic redshift, however it was observed by Allen et al. (1992) which found a redshift of 0.1259±0.0006. This is the only galaxy within the 200×200 field of-view with a redshift in the NASA/IPAC Extragalactic Database (NED)4 that does not have an SDSS spectroscopic redshift.

Ah, SDSS. So useful yet so infuriating...