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

Sarkar et al. (2023) showed that for the Milky Way circumgalactic medium profile, the electron-proton equilibrium time scale is about 1 Myr and is independent of the shock Mach number.

“Sarkar et al. (2023) showed that for the Milky Way CGM profile, t ep ∼ 1 Myr and it is independent of the shock Mach number.”

Such short-duration jets would choke before they can escape the ISM (scale height ∼200 pc), therefore, effectively creating a blast-wave-like evolution of the forward shock.

“Such short-duration jets would choke before they can escape the ISM (scale height ∼ 200 pc), therefore, effectively creating a blast-wave-like evolution of the forward shock (Yang et al. 2022; Sarkar et al. 2023).”

Jets would not be able to produce the axisymmetry and hemispherical symmetry of the FEBs.

“would not be able to produce the axisymmetry and hemispherical symmetry of the FEBs (Sarkar et al. 2023).”

For magnetic kink instability to occur within the ISM (scale height H pc), one must have L_jet < L_MKI = 4e41 erg/s (n_ism)(H/200pc)^2.

“For magnetic kink-instability to occur within the ISM (scale height, H pc), one must have L jet &lt; L MKI = 4 × 10 41 erg s -1 n ism H 2 200 pc , where n ism is the ISM particle density (Tchekhovskoy &amp; Bromberg 2016; Sarkar et al. 2023).”

Even if the TDE produces a jet, the jet would only propagate a distance of z_tde ∼ v_h,jet t_tde ∼1 pc, very similar to the simple wind-like outflow from the TDE.

“Additionally, it can also be shown that even if the TDE produces a jet, the jet would only propagate a distance of z tde ∼ vh , jet t tde ∼ 1 pc, very similar to the simple wind-like outflow from the TDE (Sarkar et al. 2023).”

The shock temperature of such a high-energy explosion is inconsistent with the O viii/O ii line ratio observations.

“The shock temperature of such a high-energy explosion is, however, inconsistent with the O viii / O ii line ratio observations (Sarkar et al. 2023).”