科学研究
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2024.05.23
Accreting massive black holes and a Czech UV space telescope
Most galaxies comparable to or larger than the mass of the Milky Way host hot, X-ray emitting atmospheres and accreting supermassive black holes. Hot atmospheres and radio jets and lobes are the ingredients of radio-mechanical active galactic nucleus (AGN) feedback. At least half of the most massive early-type galaxies harbour multi-phase filamentary gas, which appears to result from the therm...
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2024.05.21
Galaxy Assembly Revealed by the Life Cycle of Star Clusters
The life cycle of a star cluster can be broken into three epochs: 1) the birth of the cluster; 2) the long phase when the cluster evolves in gravitational equilibrium, gradually losing stars; and 3) the death of the cluster when it dissolves into a stream of stars. The clusters in the first epoch directly record the initial properties inherited from the host galaxy. The evolved clusters during ...
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2024.05.17
Portable Fantacies: How to Work with Android-like Devices
Over the past few years, the computing capability of portable devices equipped with ARM processors has expanded exponentially. Yet, despite their growing power, the prevalent Android-like operating systems often confine users to a 'walled garden,' restricting direct interaction with the core Linux functionalities. In this presentation, we will explore the transformative potential of Termux and ...
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2024.05.16
Observations and 3D MHD simulations of magnetic reconnection
Magnetic reconnection is a fundamental physical process in various astrophysical, space, and laboratory environments. In solar physics, it is even believed to be a key mechanism to heat/accelerate plasmas and drive the eruption of large-scale magnetic field, giving rise to coronal mass ejections and flares, as well as solar energetic particles. High-cadence and high-resolution observations rece...
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2024.05.14
Gravitational radiation from oscillations of ultracompact stars
By analytically solving the Teukolsky gravitational wave equation for the spacetime of an ultracompact star of constant density, we derive exact and simple formulae that completely describe weakly damped oscillations trapped inside such stars. No similar complete analytic solution was known before, despite several attempts to find it. Our solution is cast in terms of the quasi normal modes of o...
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