The Milky Way Outer Halo Is a Graveyard for Cannibalized Dwarf Galaxies
An international team of astronomers led by Giuseppina Battaglia, researcher at the Instituto de Astrofísica de Canarias (IAC), finds signs that the outer halo of the Milky Way contains stellar remains of massive dwarf galaxies that were devoured by our own. The extended stellar haloes are predicted to be an ubiquitous feature around Milky Way-like galaxies and to consist mainly of the shredded stellar component of smaller galactic systems.
Credit: Instituto de Astrofísica de Canarias (IAC)
“The abundance of some chemical elements in the stars in the external regions of the Milky Way halo – explains Giuseppina Battaglia, astrophysicist at the IAC and first author of the article – was found to be surprisingly different from the information we had concerning the inner regions of the halo”.
Stellar haloes are a common component of galaxies like the Milky Way. “The theory explaining the formation of structure and galaxies in the Universe predicts that stellar haloes, and in particular their outer regions, consist mainly of the stellar component of destroyed, smaller galaxies.” G.Battaglia comments “Qualitatively this is in agreement with the observational findings of this study, where we found remnants of cannibalized dwarf galaxies around the Milky Way.”
Our Milky Way galaxy and its small companions are surrounded by a giant halo of million-degree gas (seen in blue in this artists’ rendition) that is only visible to X-ray telescopes in space. University of Michigan astronomers discovered that this massive hot halo spins in the same direction as the Milky Way disk and at a comparable speed.
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