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HE astro seminar: Kartick Sarkar | The Racah Institute of Physics

HE astro seminar: Kartick Sarkar

Date: 
Thu, 17/11/202213:00-14:00
Location: 
https://huji.zoom.us/j/84851194881?pwd=Q3ZYS29COTVpNUo5SG43bTJpc3N0Zz09

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

Abstract: The origin of the Fermi/eROSITA bubbles still remain 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.
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