Very-high-energy $\gamma$-ray emission from young massive star clusters in the Large Magellanic Cloud

Abstract

The Tarantula Nebula in the Large Magellanic Cloud is known for its high star formation activity. At its center lies the young massive star cluster R136, providing a significant amount of the energy that makes the nebula shine so brightly at many wavelengths. Recently, young massive star clusters have been suggested to also efficiently produce high-energy cosmic rays, potentially beyond PeV energies. Here, we report the detection of very-high-energy $\gamma$-ray emission from the direction of R136 with the High Energy Stereoscopic System, achieved through a multicomponent, likelihood-based modeling of the data. This supports the hypothesis that R136 is indeed a very powerful cosmic-ray accelerator. Moreover, from the same analysis, we provide an updated measurement of the $\gamma$-ray emission from 30 Dor C, the only superbubble detected at TeV energies presently. The $\gamma$-ray luminosity above $0.5\mathrm{TeV}$ of both sources is $(2-3)\times 10^{35}\mathrm{erg}{\mathrm{s}}^{-1}$. This exceeds by more than a factor of 2 the luminosity of HESS J1646$-$458, which is associated with the most massive young star cluster in the Milky Way, Westerlund 1. Furthermore, the $\gamma$-ray emission from each source is extended with a significance of $>3\sigma$ and a Gaussian width of about $30\mathrm{pc}$. For 30 Dor C, a connection between the $\gamma$-ray emission and the nonthermal X-ray emission appears likely. Different interpretations of the $\gamma$-ray signal from R136 are discussed.

10+11 pages, 4+6 figures. Corresponding authors: L. Mohrmann, N. Komin

References in corpus (24)

• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Observations of the Crab Nebula with H.E.S.S
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit
• Parametrization of gamma-ray production cross-sections for pp interactions in a broad proton energy range from the kinematic threshold to PeV energies
• First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies
• Gamma-Hadron Separation in Very-High-Energy gamma-ray astronomy using a multivariate analysis method
• Measurement of ultra-high-energy diffuse gamma-ray emission of the Galactic plane from 10 TeV to 1 PeV with LHAASO-KM2A
• Particle acceleration in winds of star clusters
• Gammapy: A Python package for gamma-ray astronomy
• CHANDRA ACIS Spectroscopy of N157B -- A Young Composite Supernova Remnant in a Superbubble
• Cosmic ray production in superbubbles
• Massive star cluster origin for the galactic cosmic ray population at very-high energies
• A deep spectromorphological study of the $\gamma$-ray emission surrounding the young massive stellar cluster Westerlund 1
• Realistic modeling of wind and supernovae shocks in star clusters: addressing ${}^{22}\mathrm{Ne}{/}^{20}\mathrm{Ne}$ and other problems in Galactic cosmic rays
• Validation of open-source science tools and background model construction in $\gamma$-ray astronomy
• XMM-Newton study of 30 Dor C and a newly identified MCSNR J0536-6913 in the Large Magellanic Cloud
• A NECTAr-based upgrade for the Cherenkov cameras of the H.E.S.S. 12-meter telescopes
• Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N157B with the High Energy Stereoscopic System
• Understanding the TeV $\gamma$-ray emission surrounding the young massive star cluster Westerlund 1
• Pillars of creation amongst destruction: Star formation in molecular clouds near R136 in 30 Doradus
• Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud
• LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
• Core-collapse supernova inside the core of a young massive star cluster: 3D MHD simulations

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• Deciphering the gamma-ray emission in the Cygnus region
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