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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Abstract
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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