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Misaligned Jets from Sgr A* and the Origin of Fermi/eROSITA Bubbles

Sarkar, KC and Mondal, S and Sharma, P and Piran, T (2023) Misaligned Jets from Sgr A* and the Origin of Fermi/eROSITA Bubbles. In: Astrophysical Journal, 951 (1).

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Official URL: https://doi.org/10.3847/1538-4357/acd75d


One of the leading explanations for the origin of Fermi Bubbles is past jet activity in the Galactic center supermassive black hole Sgr A*. The claimed jets are often assumed to be perpendicular to the Galactic plane. Motivated by the orientation of pc-scale nuclear stellar disk and gas streams, as well as a low inclination of the accretion disk around Sgr A* inferred by the Event Horizon Telescope, we perform hydrodynamical simulations of nuclear jets significantly tilted relative to the Galactic rotation axis. The observed axisymmetry and hemisymmetry (north–south symmetry) of Fermi/eROSITA bubbles (FEBs) due to quasi-steady jets in Sgr A* could be produced if the jet had a super-Eddington power (≳5 × 1044 erg s−1) for a short time (jet active period ≲6 kyr) for a reasonable jet opening angle (≲10°). Such powerful explosions are, however, incompatible with the observed O viii/O vii line ratio toward the bubbles, even after considering electron–proton temperature nonequilibrium. We argue that the only remaining options for producing FEBs are (i) a low-luminosity (≈1040.5–41 erg s−1) magnetically dominated jet or accretion wind from the Sgr A*, or (ii) a supernovae or tidal disruption event driven wind of a similar luminosity from the Galactic center.

Item Type: Journal Article
Publication: Astrophysical Journal
Publisher: Institute of Physics
Additional Information: The copyright for this article belongs to the Author.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 28 Jul 2023 06:41
Last Modified: 28 Jul 2023 06:41
URI: https://eprints.iisc.ac.in/id/eprint/82571

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