Analytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events: A Model for the Fermi Bubbles?
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Analytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events : A Model for the Fermi Bubbles? / Ko, C. M.; Breitschwerdt, D.; Chernyshov, D. O.; Cheng, H.; Dai, L.; Dogiel, V. A.
I: Astrophysical Journal, Bind 904, Nr. 1, 46, 20.11.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Analytical and Numerical Studies of Central Galactic Outflows Powered by Tidal Disruption Events
T2 - A Model for the Fermi Bubbles?
AU - Ko, C. M.
AU - Breitschwerdt, D.
AU - Chernyshov, D. O.
AU - Cheng, H.
AU - Dai, L.
AU - Dogiel, V. A.
PY - 2020/11/20
Y1 - 2020/11/20
N2 - Capture 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 10(52) 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 largescale structures like the Fermi Bubbles. The average rate of disruption events is expected to be 10(-4) similar to 10(-5) yr(-1), providing the average power of energy release from the GC into the halo of (W)over dot similar to 3 x 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.
AB - Capture 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 10(52) 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 largescale structures like the Fermi Bubbles. The average rate of disruption events is expected to be 10(-4) similar to 10(-5) yr(-1), providing the average power of energy release from the GC into the halo of (W)over dot similar to 3 x 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.
KW - Galactic center
KW - Interstellar clouds
KW - Galactic winds
KW - Tidal disruption
KW - Superbubbles
KW - Gamma-rays
KW - Cosmic rays
KW - MASSIVE BLACK-HOLE
KW - SGR A-ASTERISK
KW - INTERSTELLAR-MEDIUM
KW - RAY
KW - MILKY
KW - STARS
KW - EMISSION
KW - RATES
KW - PARSECS
KW - GAS
U2 - 10.3847/1538-4357/abbda4
DO - 10.3847/1538-4357/abbda4
M3 - Journal article
VL - 904
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 46
ER -
ID: 252877496