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Dwarf galaxies feel the blast from larger neighbours

20 Aug 2015, 05:17 UTC
Dwarf galaxies feel the blast from larger neighbours
(200 words excerpt, click title or image to see full post)

This article originally appeared on The Conversation.
Written by Megan Johnson, Post doctoral researcher in dwarf galaxies at CSIRO
Dwarf galaxies are the most abundant galaxies in the universe. Yet understanding how these systems behave in galaxy group environments is still a mystery.
These objects are notoriously difficult to study because they are very small relative to classic spiral galaxies. They also have low mass and a low surface brightness, which means that, to date, we have only studied the dwarf galaxies in the nearby universe, out to about 35 million light years away.
My collaborators and I have been studying a dwarf galaxy named ESO 324-G024 and its connection to the northern radio lobe of a galaxy known as Centaurus A (Cen A).
The giant radio lobes are comprised of high energy charged particles, mostly made up of protons and electrons, that are moving at extremely high speeds. The lobes were created from the relativistic jet (shown in the image at the top) that is blasting out of the central core of Cen A.

The giant radio lobes of Cen A. For scale, the entire image at the top of the article fits within the small black ...

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