2021-W09

# 2102.13449
- https://arxiv.org/abs/2102.13449
- **Hoinga: A supernova remnant discovered in the SRG/eROSITA All-Sky Survey eRASS1**
- One of the nearest supernova remnants discovered with eROSITA
- by **周平**
- 逸话：In honor of the first author’s hometown Bad Hönningen am Rhein: Hoinga was its medieval name.

# 2103.00017
- https://arxiv.org/abs/2103.00017
- **A self-lensing binary massive black hole interpretation of quasi-periodic eruptions**

# 2103.01247
- https://arxiv.org/abs/2103.01247
- **X-Ray Shapes of Elliptical Galaxies and Implications for Self-Interacting Dark Matter**
- The collisionless dark matter model predicts an elliptical shape of dark matter halo. However, self-interaction process makes dark matter halo more spherical. In order to tell the ellipticity of dark matter halo, the authors measured the shape of X-ray gas which traces the gravitational potential in relaxed elliptical galaxies. They found ellipticities around 0.2-0.5, which supports self-interaction proccess to some extent, but remains compatible to cold dark matter scenario.
- ![fig](https://leanote.com/api/file/getImage?fileId=6049b756ab64411ab6000178)
- by：**胡祯崧**

# 2103.02245
- https://arxiv.org/abs/2103.02245 
- **Probing the disk-corona systems and broad line regions of changing-look quasars with X-ray and optical observations**
- first author: **金相玉**
- The authors measure the optical/UV-X-ray spectral indices and Eddington ratios of ten previously-discovered changing-look quasars (CLQs) at two or more epochs. They find similar trends in spectral index changes between X-ray binaries in accretion state transitions in low/hard states and CLQs below 1% Eddington ratios, indicating similar disk-corona systems. They also find that, during the state changing, CLQs cross the 1% Eddington ratio boundary when their broad emission lines disappear/emerge.
- ![CLQs](https://leanote.com/api/file/getImage?fileId=6049b756ab64411ab6000177)

# 2103.02461
- https://arxiv.org/abs/2103.02461
- **Outflow Bubbles from Compact Binary Mergers Embedded in Active Galactic Nuclei: Cavity Formation and the Impact on Electromagnetic Counterparts**
- The rate of BBH mergers in AGN disks is estimated to be 0.02 − 60 Gpc^{−3} yr^{−1}. The authors develop a novel scenario and describe the evolution of multiwavelength emission behavior of such event (See fig. below). Compact binary mergers in AGN disks will mostly occur in cavities. Detectable soft X-ray counterparts can be produced by recoiled remnant BHs entering the AGN disk. Outflows from CSBs could be persistent EM emitters long before the merger. 
- ![scenario](https://leanote.com/api/file/getImage?fileId=6040bdcfab64411f5b000774)

# 2103.02612
- https://arxiv.org/abs/2103.02612
- **Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A**

# 2103.00012
- https://arxiv.org/abs/2103.00012
- **2MASX J00423991+3017515: An offset active galactic nucleus in an interacting system**

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