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Article: Analytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events: A Model for the Fermi Bubbles?

TitleAnalytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events: A Model for the Fermi Bubbles?
Authors
KeywordsGalactic center
Interstellar clouds
Galactic winds
Tidal disruption
Superbubbles
Issue Date2020
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2020, v. 904 n. 1, p. article no. 46 How to Cite?
AbstractCapture and tidal disruption of stars by the supermassive black hole in the Galactic center (GC) should occur regularly. The energy released and dissipated by these processes will affect both the ambient environment of the GC and the Galactic halo. The single star of a super-Eddington eruption generates a subsonic outflow with an energy release of more than 1052 erg, which still is not high enough to push shock heated gas into the halo. Only routine tidal disruption of stars near the GC can provide enough cumulative energy to form and maintain large-scale structures like the Fermi Bubbles. The average rate of disruption events is expected to be 10−4 ~ 10−5 yr−1, providing the average power of energy release from the GC into the halo of $dot{W}sim 3 imes {10}^{41}$ erg s−1, which is needed to support the Fermi Bubbles. The GC black hole is surrounded by molecular clouds in the disk, but their overall mass and filling factor are too low to significantly stall the shocks from tidal disruption events. The de facto continuous energy injection on timescales of megayears will lead to the propagation of strong shocks in a density stratified Galactic halo and thus create elongated bubble-like features that are symmetric to the Galactic midplane.
Persistent Identifierhttp://hdl.handle.net/10722/295270
ISSN
2019 Impact Factor: 5.745
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorKo, CM-
dc.contributor.authorBreitschwerdt, D-
dc.contributor.authorChernyshov, DO-
dc.contributor.authorCheng, H-
dc.contributor.authorDai, L-
dc.contributor.authorDogiel, VA-
dc.date.accessioned2021-01-11T13:57:44Z-
dc.date.available2021-01-11T13:57:44Z-
dc.date.issued2020-
dc.identifier.citationThe Astrophysical Journal, 2020, v. 904 n. 1, p. article no. 46-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/295270-
dc.description.abstractCapture and tidal disruption of stars by the supermassive black hole in the Galactic center (GC) should occur regularly. The energy released and dissipated by these processes will affect both the ambient environment of the GC and the Galactic halo. The single star of a super-Eddington eruption generates a subsonic outflow with an energy release of more than 1052 erg, which still is not high enough to push shock heated gas into the halo. Only routine tidal disruption of stars near the GC can provide enough cumulative energy to form and maintain large-scale structures like the Fermi Bubbles. The average rate of disruption events is expected to be 10−4 ~ 10−5 yr−1, providing the average power of energy release from the GC into the halo of $dot{W}sim 3 imes {10}^{41}$ erg s−1, which is needed to support the Fermi Bubbles. The GC black hole is surrounded by molecular clouds in the disk, but their overall mass and filling factor are too low to significantly stall the shocks from tidal disruption events. The de facto continuous energy injection on timescales of megayears will lead to the propagation of strong shocks in a density stratified Galactic halo and thus create elongated bubble-like features that are symmetric to the Galactic midplane.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © IOP Publishing.-
dc.rightsThis is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI].-
dc.subjectGalactic center-
dc.subjectInterstellar clouds-
dc.subjectGalactic winds-
dc.subjectTidal disruption-
dc.subjectSuperbubbles-
dc.titleAnalytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events: A Model for the Fermi Bubbles?-
dc.typeArticle-
dc.identifier.emailDai, L: lixindai@hku.hk-
dc.identifier.authorityDai, L=rp02540-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/1538-4357/abbda4-
dc.identifier.hkuros320810-
dc.identifier.volume904-
dc.identifier.issue1-
dc.identifier.spagearticle no. 46-
dc.identifier.epagearticle no. 46-
dc.identifier.isiWOS:000591064100001-
dc.publisher.placeUnited States-

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