2021-W13

# 2103.14185
- https://arxiv.org/abs/2103.14185
- **MOCCA-SURVEY Database – I. Tidal disruption events of white dwarfs in globular clusters and young massive clusters**
- WD TDEs could be promising targets of  multi-messenger astronomy and also hint the intermediate mass BHs.
- This paper estimate the local rate density of WD TDEs in GCs and YMCs, from MOCCA-Survey Database I. And the local rate density of WD TDEs is limited to < 5x10^2 yr-1 Gpc^-3, 90% of which happened in GCs. The detectability of luminous jets, X-ray flares and thermonuclear transients, which may be induced by WD TDEs, are estimated less than 300 yr-1, 6x10^-2 yr^-1 and 550 yr^-1.
- by **鲍通**

# 2103.14914
- https://arxiv.org/abs/2103.14914
- **First-Principle Prediction of X-ray Polarization from Magnetic Reconnection in High-Frequency BL Lacs**
- In this paper, the authors make the first attempt to self-consistently predict X-ray polarization signatures of high-frequency
BL Lacs (HBLs) via combined particle-incell (PIC) and polarized radiation transfer simulations.
They find that the X-ray polarization is much more variable than optical polarization.
Given the sensitivity of the Imaging X-ray Polarimetry Explorer (IXPE), it may obtain one to a few polarization data points for one flaring event of nearby bright HBLs Mrk 421 and 501.
However, it may not fully resolve the highly variable X-ray polarization.
- by **黄健**

# 2103.14937
- https://arxiv.org/abs/2103.14937 
- **A note on some discrepancies in convolution models in X-ray spectral analysis**
- 这个小短篇只是给大家提了个醒儿，作者发现用Xspec拟合谱线（尤其是Fe Ka线）的时候，要慎用convolution model，例如rdblur/ kerrconv等模型。作者发现，根据同样的模拟结果制作的convolution模型和additive格点模型，在各种参数都相同时，在Xspec内给出的谱形某些bin上两者有10%的偏离。但是把卷积模型拿到Xspec外，作者自己写的Fortran算出的谱形与additive模型得到的就没有显著区别了。所以可能是Xspec的问题\_(:з」∠)\_
- ![deviation](https://leanote.com/api/file/getImage?fileId=6065cc3dab64417737000404)
- by **方正**

# 2103.16576
- https://arxiv.org/abs/2103.16576
- **Three Ultraluminous X-ray Sources Hosted by Globular Clusters in NGC 1316**
- Three ULXs are identified in globular clusters of NGC 1316, an early type galaxy ~20 Mpc away, by Chandra+HST data.
- They show no variations for more than a factor ~2 within both short and long time scale, consistent with most known GC ULXs.
- Studies of optical properties indicate the ULX hosting clusters tend to be more luminous and redder compared with non-ULX hosting clusters.
- by **鲍通**

# 2103.16757
- https://arxiv.org/abs/2103.16757
- **Disk vs wind accretion in X-ray pulsar GX 301-2**
- GX301-2 is a unique object in which we are able to study both the disk accretion as well as the wind accretion. Using HXMT observations, the authors report a spin-up event and a change in the pulse profile. Possible differences between disk and wind accretion may explain the observed different trend of pulse profiles.
- by **华子乾**

# 2103.15414
- https://arxiv.org/abs/2103.15414
- **Evidence for an intermediate-mass black hole from a gravitationally lensed gamma-ray burst**
- The authors present a Bayesian analysis identifying gravitational lensing in the light curve of GRB 950830. The inferred lensed mass denpends on the unknow lens redshift z_l, and is given by (1+z_l)M_l ~ 5.5 * 10^4 Msun.  The authors interpret as evidence for an intermediate-mass black hole. The GRB 950830 was unlikely lensed by a globular cluster since they infer a cosmic density inconsistent with predictions for globular clusters \Omega_GC ～ 8*10^-6.
- by **喻历明**

# 2103.15442
- https://arxiv.org/abs/2103.15442
- **X-ray properties of TDEs**
- 这是一篇review儿

# 2103.16068
- https://arxiv.org/abs/2103.16068
- **On the Magnetic Fields of Ultraluminous X-ray Pulsars**
- author: **李向东**

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