2021-W17-18

# 2104.11256
- https://arxiv.org/abs/2104.11256
- **Nitrogen X-ray absorption in the local ISM**
- The authors present the first detailed Nitrogen K-edge absorption of gaseous ISM using high-resolution XMM-Newton spectra of 12 Galactic and 40 extragalactic sources. They estimate the column density of N I (cold phase), N II + N III (warm phase) and N V + N VI + N VII (hot phase). They found that the cold-warm component column densities decrease with the Galactic latitude while the hot component does not. 
- ![N-K-edge](https://leanote.com/api/file/getImage?fileId=6093948bab6441404b002887)
- by **方正**

# 2104.13388
- https://arxiv.org/abs/2104.13388
- **X-ray Quasi-Periodic Eruptions from two previously quiescent galaxies**
- mentioned by **罗斌**

# 2105.01085
- https://arxiv.org/abs/2105.01085
- **Intermediate mass black holes from stellar mergers in young star clusters**
- This paper investigate the IMBH forming process, including BBH mergers and runaway collision mechanism in young star clusters. 
From results of 10^4 simulations of young star cluster within 100 Myr, they conclude that:
    1. IMBH formation is much less effcient at high metallicity, because of more effective stellar winds
    2. Most of IMBHs are formed via runaway collision, due to the low mass of simulated star clusters.
    3. About half of IMBHs are ejected in the first 25 Myr, the remainings rapidly sink towards the center.
- by **鲍通**

# 2104.14627
- https://arxiv.org/abs/2104.14627
- **A weakening Compton hump and Soft X-ray excess detected in the Seyfert-1 galaxy MCG –02–58–22**
- Using observations by Suzaku, XMM and NuSTAR, it is found that while the primary X-ray emission stay constant, in 2016 the sofe excess decreased, Compton hump weakened and the narrow FeK emission line became marginally broad. The authors argue that any changes must arise due to changes in the reprocessing media and raise a physical explanation.
- by: **华子乾**

# 2105.02661
- https://arxiv.org/abs/2105.02661
- **Completing the X-ray view of the recently discovered supernova remnant G54.41+0.03**
- authors: **周平**、**孙磊**

# 2105.02557
- https://arxiv.org/abs/2105.02557
- **Constraining density and metallicity of the Milky Way's hot gas halo from O VII spectra and ram-pressure stripping**
- mentioned by **李志远**

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