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Astrophysical Black Holes: A Rapidly Moving Field

23–26 Jun 2023
University of Hong Kong, Centennial Campus, CPD 3.04
Asia/Hong_Kong timezone

Session

Relativistic jets and particle acceleration

25 Jun 2023, 09:30
University of Hong Kong, Centennial Campus, CPD 3.04

University of Hong Kong, Centennial Campus, CPD 3.04

Central Podium Levels – Three, Run Run Shaw Tower, Centennial Campus, The University of Hong Kong, The University of Hong Kong, Pokfulam, Hong Kong

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  1. 60. Looking for Physics in the Weather: 30 Years of Gamma-Ray Blazar Observations
    Prof. Paolo Coppi (Yale University)
    25/06/2023, 09:30
    Talk

    The launch of the Compton Gamma-Ray Observatory in 1991 revealed that the powerful relativistic outflows (“jets”) produced by accreting supermassive black holes are in fact some of the most prodigious emitters of gamma-rays in the Universe. Even accounting for likely relativistic beaming and boosting effects, this gamma-ray emission can represent a significant of the black hole’s accretion...

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  2. 69. The Observation of the Brightest GRB 221009A by LHAASO
    Prof. Zhen Cao
    25/06/2023, 10:05
    Talk

    LHAASO observed GRB221009A, as the brightest GRB, with it nearly in the middle of the FoV. The onset of the afterglow in TeV band was first time observed by measuring the flux from the GRB since T0 set by a precursor. This enables 1) Determining the start time of the afterglow T* $\sim 226$ s after T0; 2) Setting the most strict limit on the prompt emission in TeV band $\sim10^{-5}$; 3)...

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  3. 70. Black holes as cosmic accelerators
    Dr Noemie Globus
    25/06/2023, 11:10
    Talk

    The origin of ultra high energy cosmic rays remains a mystery. It represents the challenge of finding the nature of the most powerful particle accelerators in the Universe, which exhibit collisions with center of mass energies about 100 times those attainable at the LHC. During their acceleration process, they produce high energy gamma-rays and neutrinos. These secondary messengers reveal...

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  4. 24. Particle acceleration in AGN jets
    Dr Jieshuang Wang
    25/06/2023, 11:45
    Talk

    Jets of active galactic nuclei are observed from less than parsec scale to mega-parsec scale. They are powerful particle accelerators shining across the electromagnetic spectrum. In this talk, (1) I’ll mainly present our analytical and numerical works on shear acceleration. Recent observations indicate a synchrotron origin of X-ray emission in kpc-scale, which requires in-situ acceleration of...

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  5. 33. Extreme particle acceleration at AGN jet termination shocks
    Prof. Gwenael Giacinti (Tsung-Dao Lee Institute & Shanghai Jiao Tong University)
    25/06/2023, 12:03
    Talk

    Extragalactic plasma jets are some of the few astrophysical environments able to confine ultra-high energy cosmic rays, but whether they are capable of accelerating these particles is unknown. In this work, we revisit particle acceleration at relativistic magnetized shocks beyond the local uniform field approximation, by considering the global transverse structure of the jet. Using large...

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