Misaligned jets from Sgr A* and the Fermi/eROSITA bubbles

by Dr. Kartick Sarkar

HUJI

at Astrophysics and Cosmology Seminar

Wed, 18 Jan 2023, 11:10
Sacta-Rashi Building for Physics (54), room 207

Abstract

The origin of the Fermi/eROSITA bubbles still remains a debated question. One of the popular theories is that the bubbles are driven by a past AGN jet from the Sgr A*. A crucial assumption for the claimed jet is that the jet is launched along the rotation axis of the Galaxy despite several observational pieces of evidence indicating a different picture. In this talk, I will discuss the general effects of a misaligned jet in the Milky Way ISM. We find that the dissipation of the claimed jet within the ISM is an essential requirement for simultaneously producing the symmetrical features of the Fermi/eROSITA bubbles and the observed x-ray signatures. We show that hydrodynamic jets from Sgr A* fail to produce these features and therefore are ruled out. Other Blackhole driven mechanisms such as a magnetic jet, accretion wind, or TDEs, can in principle produce these features provided their power is ~ 10^{40.5-41} erg/s.

Created on 15-01-2023 by Zitrin, Adi (zitrin)
Updaded on 15-01-2023 by Zitrin, Adi (zitrin)