2021-W49

#2112.04531
- https://arxiv.org/abs/2112.04531
- **Evidence for a Compact Object in the Aftermath of the Extra-Galactic Transient AT2018cow**
- In this work, the authors present evidence for a 224Hz (3.7sigma) quasi-periodic oscillation (QPO) in AT2018cow through NICER's two month monitor. The QPO has a fractional rms amplitude of >30% and is persistent in two month monitor which started at five days after optical discovery of the transient. This high-frequency of QPO shows evidence for a compact object in AT2018cow which can be a neutron star or a black hole with mass less than 850 solar masses.
- by: 苏钊

# 2112.05318
- https://arxiv.org/abs/2112.05318
- **Potential Black Hole Seeding of the Spiral Galaxy NGC 4424 via an Infalling Star Cluster**
- They have discovered a star cluster, referred to as Nikhuli, locating at ~400pc from the post-merger galaxy NGC 4424 from HST imaging. Combining its stellar mass and Mbh-Mnsc relation, it is suggested to harbor an IMBH of 7x10^4 Ms. And the corresponding CXO X-ray source is with Lx=0.7x10^39 erg/s and gamma=1.7, indicating it more like to be a sub-Eddington massive black hole. From the stellar mass and velocity dispersion of NGC 4424,the central black hole mass is expected to be (0.6-1.0)x10^5 Ms. Nikhuli may be the delivery vehicle for seeding a, or at least helping to grow the, massive black hole in NGC 4424.
- ![fig1](https://leanote.com/api/file/getImage?fileId=61bb30f8ab644142c0843864)
- by: 鲍通

# 2112.07105
- https://arxiv.org/abs/2112.07105
- **The NuSTAR, XMM-Newton, and Suzaku view of Abell 3395 at the intercluster filament interface**
- The Abell 3395 is a galaxy cluster with two merging subcluster at z = 0.0498. eRosita has found a 'intercluster filament' between Abell 3391. The authors used newly observed NuSTAR spectrum, together with XMM-Newton and Suzaku, to derive the spatial distribution of temperature, entropy, pressure and density. They found the interface between the intercluster filament and ICM has low temperature, high density and low entropy, which suggest the ICM is cooling and flowing onto the filament instead of shock heated as reported in eRosita results.
- eRosita results: https://www.aanda.org/articles/aa/pdf/2021/03/aa39590-20.pdf
- by: 方正

# 2112.07734
- https://arxiv.org/abs/2112.07734
- **Multi-wavelength quasi-periodic pulsations in a stellar superflare**
- by: 华子乾儿

# 2112.06483
- https://arxiv.org/abs/2112.06483
- **Evidence for A Hot Wind from High-resolution X-ray Spectroscopic Observation of the Low-luminosity Active Galactic Nucleus in NGC 7213**
- by: local expert

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