Constraining cosmic-ray acceleration in the magnetospheric gaps of Sgr A*

Abstract

Sagittarius A* (Sgr A*) is a potential VHE gamma-ray and cosmic-ray source. We examine limits to gap-type particle acceleration in the magnetosphere of Sgr A*, showing that in the current phase of activity proton acceleration to PeV energies is possible, with injection powers into the environment usually limited to several 10^{36} erg/s. Compton upscattering of ambient soft photons by gap-accelerated electrons could yield TeV emission compatible with the detected VHE points source. We explore the dependency of the results on changes in the accretion rate showing that higher stages in the past are unlikely to increase the power output unless the inner accretion flows itself changed its configuration.

arXiv commentAccepted for Publication in ApJL

References in corpus (44)

• Hot Accretion Flows Around Black Holes
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Cosmic-ray propagation and interactions in the Galaxy
• First M87 Event Horizon Telescope Results. II. Array and Instrumentation
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• Acceleration of petaelectronvolt protons in the Galactic Centre
• An Update on Monitoring Stellar Orbits in the Galactic Center
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• A strong magnetic field around the supermassive black hole at the centre of the Galaxy
• Scaling Laws for Advection Dominated Flows: Applications to Low Luminosity Galactic Nuclei
• An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis
• Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
• Science with the Cherenkov Telescope Array
• The Submillimeter Bump in Sgr A* from Relativistic MHD Simulations
• The Fermi Bubbles. I. Possible Evidence for Recent AGN Jet Activity in the Galaxy
• The simultaneous spectrum of Sgr A* from 20cm to 1mm and the nature of the mm-excess
• The Fermi Bubbles: Supersonic AGN Jets with Anisotropic Cosmic Ray Diffusion
• Variable TeV emission as a manifestation of jet formation in M87?
• High energy gamma rays from the massive black hole in the Galactic Center
• Spectrum and variability of the Galactic Center VHE gamma-ray source HESS J1745-290
• Variability of Sagittarius A* - Flares at 1 Millimeter
• The Size, Shape, and Scattering of Sagittarius A* at 86 GHz: First VLBI with ALMA
• General relativistic magnetohydrodynamical $\kappa$-jet models for Sgr A*
• ALMA Polarimetry of Sgr A*: Probing the Accretion Flow from the Event Horizon to the Bondi Radius
• The mean infrared emission of SagittariusA*
• Traces of past activity in the Galactic Centre
• Particle-in-cell simulations of pair discharges in a starved magnetosphere of a Kerr black hole
• Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S
• Ultra-High Energy Cosmic Ray production in the polar cap regions of black hole magnetospheres
• ALMA and VLA measurements of frequency-dependent time lags in Sagittarius A*: evidence for a relativistic outflow
• A Cool Accretion Disk around the Galactic Centre Black Hole
• Limits on the Short Term Variability of Sagittarius A* in the Near-Infrared
• Hard X-ray Morphological and Spectral Studies of The Galactic Center Molecular Cloud Sgr B2: Constraining Past Sgr A* Flaring Activity
• Self-consistent spectra from radiative GRMHD simulations of accretion onto Sgr A*
• Existence of steady gap solutions in rotating black hole magnetospheres
• TeV Gamma-ray Observations of The Galactic Center Ridge By VERITAS
• An X-ray survey of the central molecular zone: variability of the Fe Ka emission line
• Sagittarius A* as an Origin of the Galactic PeV Cosmic Rays?
• Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei
• Lepton acceleration in the vicinity of the event horizon: Very-high-energy emissions from super-massive black holes
• Gap-type Particle Acceleration in the Magnetospheres of Rotating Supermassive Black Holes
• Contribution of the Galactic center to the local cosmic-ray flux

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