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Unveiling massive stellar clusters as cosmic ray accelerators

Project description

Profiling massive stellar clusters: potential sources of galactic cosmic rays

Galactic cosmic rays are composed of nuclei that have had their electrons stripped away travelling near the speed of light. Their origin outside our solar system may be young massive stellar clusters. However, the exact sites, acceleration physics and power sources of cosmic ray production in such clusters are not known. With the support of the Marie Skłodowska-Curie Actions programme, the MeerSHOCKS project will leverage MeerKAT and Australian Square Kilometre Array Precursor observations in a pioneering study to locate the shock sites in three massive clusters, measure the microphysical properties of the acceleration process, and measure the power reservoir in massive star winds in these clusters.

Objective

The origin of Galactic cosmic rays is a persistent and fundamental open question in modern astrophysics. Gamma-ray observations have in the past five years suggested young massive stellar clusters as prominent cosmic ray accelerators but remain unable to provide smoking gun evidence for this scenario. Specifically, the exact sites, acceleration physics, and power sources of cosmic ray production in such clusters are unknown and unquantified. Building on revolutionary developments in radio telescope capabilities to overcome these limitations, I will explore novel MeerKAT and Australian Square Kilometre Array Precursor observations to, for the first time: (i) directly locate the shock sites of cosmic ray acceleration in three massive clusters; (ii) measure the microphysical properties of the acceleration process using stellar bow shocks as pristine, isolated testbeds; and (iii) obtain the most complete measurements of the power reservoir in massive star winds in these clusters. This three-step approach will confirm young massive stellar clusters as cosmic ray accelerators, reveal the exact acceleration scenario for the first time, measure currently unconstrained but essential physical properties for cluster modelling (large scale and local magnetic fields, acceleration efficiencies, cumulative stellar wind power), and lay the foundation for synergies between planned future radio and gamma-ray telescopes. I will openly distribute all analysed radio images and analysis tools developed in this Action to facilitate open science and maximize their impact as a training tool for the astrophysical community. I will furthermore develop an interactive high-school engagement module based on the analysed MeerKAT data. Performing this work at the UvA, I will simultaneously acquire the research, management, and supervision training that will complete my transition into a fully rounded research group leader.

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Programme(s)

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Topic(s)

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Funding Scheme

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

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(opens in new window) HORIZON-MSCA-2023-PF-01

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Coordinator

UNIVERSITEIT VAN AMSTERDAM
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 187 624,32
Total cost

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