2021-W24

# 2106.06567
- https://arxiv.org/abs/2106.06567
- **The X-Rays wind connection in PG 2112+059**
- The authors use contemporaneous Chandra and HST spectra of highly X-ray variable quasar PG 2112+059, to study the connection between X-ray and UV Broad Absorption Line(BAL) wind.
- They found that the increase in the EWs of the BAL lines is accompanied by a redder UV spectrum and a significant dimming in soft X-ray emission. 
- They suggest a wind-shield scenario where the inclination angle of the wind is decreasing or the mass of wind is increasing.
- by : 方正

# 2106.07657
- https://arxiv.org/abs/2106.07657
- **Multiwavelength evidence for a new flare-mode transitional millisecond pulsar**
- They discoverd a low-mass X=ray binary, inferred by the combination of X-ray spectrum, extreme X-ray and optical variability and  the persistent presence of an optical accretion disk, likely associated with Fermi GeV γ-ray source 4FGL J0540.0–7552. This source is classified as a transitional MSP in the sub-luminous disk state with unique state change, i.e, brighter
in the optical and X-rays and fainter in γ-rays sometime in mid-2013.
- by **鲍通**

# 2106.08262
- https://arxiv.org/abs/2106.08262
- **X-ray Super-Flares From Pre-Main Sequence Stars: Flare Modeling**
- by **张孟飞**

# 2106.08330
- https://arxiv.org/abs/2106.08330
- **Light, medium-weight or heavy? The nature of the first supermassive black hole seeds**
- The origin of SMBHs observed at z>6 is still difficult to explain. The authors investigate the role of three seed populations in the formation of z>6 SMBHs with semi-analytical model.
- They find that the inclusion of medium-weight seeds does not qualitatively change the growth of the first SMBHs, and the mass growth at z<15 is mainly driven by efficient gas accretion on to heavy progenitors. Despite smaller number, heavy BH seeds provide the largest contribution to the SMBH mass growth.
- by **苏钊**

# 2106.08835
- https://arxiv.org/abs/2106.08835
- **AT2019 avd: A tidal disruption event with a two-phase evolution**
- This unusual TDE event has double peaks in its optical light curve and follow-up Swift observations capture X-ray emission with large variability during the second peak. The two peaks last ~400 and 600 days seperately and there is a ~700 days gap between them. The authors use a circularization process plus a delayed accretion process to explain the physics behind this source. In their results, the SMBH is about 7×10^6 solar mass and the disrupted star is about 0.9 solar mass.
- by **华子乾**

# 我觉得还能抢救一下本周的Xread
- https://iopscience.iop.org/article/10.3847/1538-4357/abd185
- **喻历明**

# 奇文共欣赏
- https://arxiv.org/pdf/2106.08924.pdf
- **Conceptual Analogies Between Multi-Scale Feeding and Feedback Cycles in Supermassive Black Hole and Cancer Environments**

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