Gamma-rays from millisecond pulsar population within the central stellar cluster in the Galactic Center

Abstract

It was proposed that the central dense stellar cluster in the Galactic Center, containing the mass of $\sim$4 times larger than that of the central black hole, had been formed as a result of a merging of several massive globular clusters. These globular clusters are expected to provide a large number of millisecond pulsars (MSPs) within the central parsec of the Galactic Center. We propose that the GeV $\gamma$-ray emission observed from the Galactic Center is in fact a cumulative effect of the emission from several globular clusters captured by the Galactic Center black hole. Moreover, the millisecond pulsars in globular clusters accelerate leptons in their wind zones to energies of the order of a few tens of TeV injecting them into the dense infrared and optical radiation region present within the central parsec. We calculate the expected TeV $\gamma$-ray emission produced by these leptons by the Inverse Compton Scattering process in the soft radiation field. It is shown that this emission can be responsible for the multi-TeV $\gamma$-rays observed by the Cherenkov telescopes from the Galactic Center for reasonable densities of the soft radiation, diffusion models for the propagation of leptons, their injection parameters (fluxes and spectral proprieties). If the energy conversion efficiency from the pulsars to the relativistic leptons is of the order of 10%, then about a thousand of MSPs have to be present in the central cluster in the Galactic Center.

12 pages, 2 figures, accepted to MNRAS Letters

References in corpus (2)

• Inverse Compton Scenarios for the TeV Gamma-Ray Emission of the Galactic Centre
• The Dense Stellar Systems Around Galactic Massive Black Holes

Cited by in corpus (21)

• Strong support for the millisecond pulsar origin of the Galactic center GeV excess
• Disrupted Globular Clusters Can Explain the Galactic Center Gamma Ray Excess
• Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
• Radio detection prospects for a bulge population of millisecond pulsars as suggested by Fermi LAT observations of the inner Galaxy
• Birth, life, and death of black hole binaries around supermassive black holes: dynamical evolution of gravitational wave sources
• The Gamma-Ray Pulsar Population of Globular Clusters: Implications for the GeV Excess
• VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies
• Low Mass X-Ray Binaries in the Inner Galaxy: Implications for Millisecond Pulsars and the GeV Excess
• Testing the millisecond pulsar scenario of the Galactic center gamma-ray excess with very high energy gamma-rays
• Disrupted Globular Clusters and the Gamma-Ray Excess in the Galactic Centre
• Gamma-ray and X-ray emission from the Galactic Centre: hints on the nuclear star cluster formation history
• Gamma rays from the Galactic Centre region: a review
• Investigating the Uniformity of the Excess Gamma rays towards the Galactic Center Region
• Discovery of a new extragalactic source population of energetic particles
• Evidence for a high-energy tail in the gamma-ray spectra of globular clusters
• Pevatron at the Galactic Center: Multi-Wavelength Signatures from Millisecond Pulsars
• Connecting the new H.E.S.S. diffuse emission at the Galactic center with the Fermi GeV excess: a combination of millisecond pulsars and heavy dark matter?
• Inverse Compton emission from millisecond pulsars in the Galactic bulge
• Fermi LAT observations of Sagittarius A*: Imaging Analysis
• A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe
• High Energy Emission from the Galactic Center