The Effects of the Non-Gravitational Processes to the Thermodynamic of the Intracluster Medium
| Main Author: | Zhenghao |
|---|---|
| Format: | info Proceeding Journal |
| Bahasa: | eng |
| Terbitan: |
, 2022
|
| Online Access: |
https://zenodo.org/record/6471684 |
Daftar Isi:
- Abstract: Galaxy clusters, located at the nodes of the large-scale structure of the Universe, are valuable celestial bodies in astrophysics. Although structure formation and evolution of the galaxy clusters are dominated by gravity, the non-gravitational processes cannot be neglected. To study their effects, we constructed a physical model by taking into account the effects of gravity, gas thermal history, gas compression, non-thermal pressure support, as well as the gas clumping effect to describe the gas temperature, gas density, and total gravitational mass of a galaxy cluster. After fitting the model to the Chandra, XMM, or Suzaku observations of 47 galaxy clusters or groups, we calculated their physical properties and reached the following results: (1) The gas entropy distribution agrees with the prediction from adiabatic simulations near the virial radius, which implies that gravity dominates the evolution at that radius; (2) The feedback energy released from non-gravitational processes is about 10 keV per particle at the center of galaxy clusters, while the value decreases monotonically to 0 at about 0.35r200; (3) Assuming all feedback energy comes from the supermassive black holes (SMBHs) of the BCGs, we found the upper limit of the feedback efficiency to be ~0.02, which is lower than that of a typical spinning black hole, implying that SMBHs are non-spinning. Related reference paper and ADS link: https://ui.adsabs.harvard.edu/abs/2021ApJ...908...17Z/abstract This talk is delivered in Chinese (中文).
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