Precessing Black Hole Jets and Galactic Fossils
Maria J. Rodriguez

TL;DR
This paper proposes a unified model linking the Galactic Centre gamma-ray excess and Fermi bubbles to a past jet activity of SgrA$^{ullet}$, involving cosmic-ray injection and jet precession.
Contribution
It introduces a novel scenario where both phenomena are fossil imprints of a single past jet episode from SgrA$^{ullet}$, incorporating jet precession and cosmic-ray transport.
Findings
The model explains the GCE and FEB as remnants of a 7.5 Myr ago jet activity.
A hadronic contribution of 3-14% to the GCE surface brightness is consistent with observations.
The scenario supports a high black hole spin (a$^{ullet}$ = 0.9) in SgrA$^{ullet}$.
Abstract
The Galactic Centre gamma-ray excess (GCE) - an anomalous ~ 2-5 GeV Fermi-LAT signal around SgrA - has remained without a consensus interpretation for more than fifteen years. Dark-matter annihilation and unresolved millisecond-pulsar populations remain the leading candidates, yet neither incorporates the past activity of SgrA recorded by the Fermi and eROSITA bubbles (FEB). We propose a unified scenario in which both the GCE and the FEB are fossil imprints of a single past episode of SgrA activity: a precessing parabolic Blandford-Znajek jet launched from a tilted, magnetically arrested disc during a ~7.5 Myr active phase ending ~ 2.6 Myr ago. The jet both inflated the kpc-scale FEB and injected hadronic cosmic rays contributing to the GCE flux. The model rests on three independently motivated inputs: the EHT-proposed ~ tilt of the…
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