2021-W12

# 2103.10543
- https://arxiv.org/abs/2103.10543
- **BAT AGN Spectroscopic Survey XXVII: Scattered X-Ray Radiation in Obscured Active Galactic Nuclei**
- The authors use a sample of 386 hard-X-ray-selected, nearby obscured AGN observed by Swift/BAT to study the properties of Thomson-scattered X-ray radiation. Correlations between the scattering fraction and the column density as well as the ratio of [OIII] λ5007 to X-ray luminosity are found. The authors also raise two possible explanations to understand the physical mechanism.
- by: **华子乾**

#2103.10963
- https://arxiv.org/abs/2103.10963
- **Accretion-Induced Collapse of Neutron Stars in the Disks of Active Galactic Nuclei**
- AGN disks constitute an ideal environment for an interesting phenomenon: the accretion induced collapse (AIC) of neutron stars (NSs) to black holes (BHs). The authors compute the rates of AICs and their locations within the disks, and they discuss observable prospects and signatures of AICs emerge from disks.
- by: **黄健**

# 2103.11224
- https://arxiv.org/abs/2103.11224
- **X-ray Constraint on Location of AGN Torus in Circinus Galaxy**
- The line widths of X-ray fluorescence lines originated from the torus, particularly Fe Kα, carry key information on the radii of line emitting regions. The authors use the XCLUMPY model to construct a realistic model of emission line profile from AGN torus. Applying this model to the 3-100 keV spectra of Circinus galaxy observed by Suzaku, XMM, NuSTAR and Chandra, they found the torus of this AGN has the following geometry: inclination angle ~ 78 deg, angular width ~ 10.3 deg, Z ~ 1.5 Z\_sun, R\_in ~ 0.016 pc which is 3 times smaller than expected from dust sublimation. The inner part of the torus may be composed of dust-free gas.
- by:**施方正**

# 2103.11650
- https://arxiv.org/abs/2103.11650
- **A new candidate pulsating ULX in NGC 7793**
- This paper report a new ULX in NGC 7793, with a variability factor over 1000. A candidate pulsation of 2.52 Hz and associated Pdot about 3.5x10^(-8) are detected by using XMM Newton observations. This discovery makes NSC 7793 as the first known galaxy hosting two pulsating ULXs.
- by： **鲍通**

# 2103.12398
- https://arxiv.org/abs/2103.12398
- **Signatures of large-scale cold fronts in the optically-selected merging cluster HSC J085024+001536**
- The target HSC J085024+001536 is defined as a merging cluster with a main-cluster in the SE and a sub-cluster in the NW. A joint X-ray, weak-lensing and optical study has been carried out and three arc-like excess pattern are found. One of them locates close to the subcluster has a cold front feature. A conclusion is made in this paper that  the cluster is at the second impact or later.
- by **华子乾**

# 2103.12787
- https://arxiv.org/abs/2103.12787
- **Dips and eclipses in the X-ray binary Swift J1858.6-0814 observed with NICER**
- Using NICER monitoring of the X-ray binary Swift J1856.6-0814, a orbital period of ~ 21.3 hrs and an eclipse duration of ~ 1.14 hrs are discovered. The authors find that the bright flares have a higher occurrences in the post-eclipse phase and they argue that variable obscuration can be the reason of the unusually strong variability.
- by **华子乾**

# 2103.13374
- https://arxiv.org/abs/2103.13374
- **Photoionisation Modelling of the X-ray Emission Line Regions within the Seyfert 2 AGN NGC 1068**
- The authors compare the XMM-Newton PN/RGS spectra of Type 2 AGN NGC 1068 between 2000 and 2014. After photoionization modelling, they found almost no change in the ionization parameter between the two epoches, suggesting that the emission line regions are fairly static or lack of BH variability over 14-year scale. 
- They also found that the highest ionization state plasmas are thermally unstable and much more closer to the central BH.
- The majority of the emission lines are explained by photoionized plasma. But unlike previous studies,  at least two spectral features require a collision- ally ionized component.
- ![spec](https://leanote.com/api/file/getImage?fileId=605c7278ab6441507e0002cf)
- by: **施方正**

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