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  Detection of large-scale X-ray bubbles in the Milky Way halo

Predehl, P., Sunyaev, R. A., Becker, W., Brunner, H., Burenin, R., Bykov, A., et al. (2020). Detection of large-scale X-ray bubbles in the Milky Way halo. Nature, 588(7837), 227-231. doi:10.1038/s41586-020-2979-0.

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Predehl, P., Author
Sunyaev, R. A.1, Author              
Becker, W., Author
Brunner, H., Author
Burenin, R., Author
Bykov, A., Author
Cherepashchuk, A., Author
Chugai, N., Author
Churazov, E.1, Author              
Doroshenko, V., Author
Eismont, N., Author
Freyberg, M., Author
Gilfanov, M.1, Author              
Haberl, F., Author
Khabibullin, I.1, Author              
Krivonos, R., Author
Maitra, C., Author
Medvedev, P., Author
Merloni, A., Author
Nandra, K., Author
Nazarov, V., AuthorPavlinsky, M., AuthorPonti, G., AuthorSanders, J. S., AuthorSasaki, M., AuthorSazonov, S., AuthorStrong, A. W., AuthorWilms, J., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: The halo of the Milky Way provides a laboratory to study the properties of the shocked hot gas that is predicted by models of galaxy formation. There is observational evidence of energy injection into the halo from past activity in the nucleus of the Milky Way; however, the origin of this energy (star formation or supermassive-black-hole activity) is uncertain, and the causal connection between nuclear structures and large-scale features has not been established unequivocally. Here we report soft-X-ray-emitting bubbles that extend approximately 14 kiloparsecs above and below the Galactic centre and include a structure in the southern sky analogous to the North Polar Spur. The sharp boundaries of these bubbles trace collisionless and non-radiative shocks, and corroborate the idea that the bubbles are not a remnant of a local supernova but part of a vast Galaxy-scale structure closely related to features seen in γ-rays. Large energy injections from the Galactic centre are the most likely cause of both the γ-ray and X-ray bubbles. The latter have an estimated energy of around 1056 erg, which is sufficient to perturb the structure, energy content and chemical enrichment of the circumgalactic medium of the Milky Way.

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Language(s): eng - English
 Dates: 2020-12-09
 Publication Status: Published online
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 Identifiers: DOI: 10.1038/s41586-020-2979-0
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 588 (7837) Sequence Number: - Start / End Page: 227 - 231 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238