2021-W10

# 2103.03844
- https://arxiv.org/abs/2103.03844
- **The Post-impact Evolution of the X-ray Emitting Gas in SNR 1987A Viewed by XMM-Newton**
- first author: 孙磊
- 在这片文章中我们分析了自2007年以来XMM-Newton对SN1987A的全部观测数据(包括了RGS和pn)，并基于双温光谱模型的拟合讨论了这个年轻遗迹中热气体的性质和演化。
- by **孙磊**

# 2103.03879
- https://arxiv.org/abs/2103.03879
- **Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years**
- The authors present a 265 ks deep Chandra observation of a quasar at z~5.8. They find X-ray excess along the diretion where the radio jet extend by modeling the X-ray density profile, possibily induced by the inverse-Compton process of CMB photons in the jet. They also confirm that the secondary X-ray point source along the jet direction is not associate with quasar. 
- ![fig](https://leanote.com/api/file/getImage?fileId=6049b757ab64411ab600017c)

# 2103.03989
- https://arxiv.org/abs/2103.03989
- **A 2 day orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397**
- comments from **鲍通**

# 2103.04800
- https://arxiv.org/abs/2103.04800
- **Eight new millisecond pulsars from the first MeerKAT globular cluster census**
- They discovered 8 new MSPs in six different globular clusters by MeerKAT radio telescope array.
One of them locates at a high eccentric orbit which may be resulted from dynamical exchange.
Evidence from pulsar timing indicates the NS is massive, exceeding 2 Ms.
- by **鲍通**

# 2102.02207
- https://arxiv.org/abs/2102.02207
- **A deep search for decaying dark matter with XMM-Newton blank-sky observations**
- Sterile neutrinos with masses in the keV range is a candidate for dark matter. The decay process of sterile neutrino can yield X-ray photons which can be detected by X-ray telescope. This work performs a sensitive search across 5 to 16 keV energy band using XMM-Newton blank-sky survey data. No evidence is found for unassociated X-ray lines, which produces a strong constraints on decaying DM in this mass range.
- by: 胡祯崧

# 旧文新读
- https://ui.adsabs.harvard.edu/abs/2020Sci...367.1465D/abstract
- **The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations**
- An unidentified 3.5 keV line observed in nearby galaxies and galaxy clusters is considered as the decay signal of 7 keV sterile neutrino as dark matter. This paper ultilizes the XMM-Newton blank-sky observation in the Milky Way to detect the signal in the local dark matter halo. The advantage for this search is the lower X-ray background. However, the result is inconsistent with the possibility taht 3.5 keV line originates from dark matter decay.
- by: 胡祯崧

# 2103.04994
- https://arxiv.org/abs/2103.04994
- **A Hard Look At Relativistic Reverberation in MCG-5-23-16 & SWIFT J2127.4+5654: Testing the Lamp-Post Model**
- Using the NuSTAR data of MCG–5-23-16 and SW J2127, the authors found that the X-ray reverberation delays are not consistent with a static lamp-post model.
- by: 黄健

# 2103.05053
- https://arxiv.org/abs/2103.05053
- **The Colliding Winds of WR 25 in High Resolution X-rays**
- The authors present the first high-resolution X-ray spectra of the colliding wind binary system WR25 with Chandra HETG. They found the pre-shock velocity to be ~1918 km/s. And the blue-shifted emission line centroid increases with wavelength, likely due to the increased opacity of neutral matter which increasingly absorbs emission from receding plasma. Large FWHM of resolved emission lines indicates that the l.o.s would be along the shock-cone.
- ![spec](https://leanote.com/api/file/getImage?fileId=6049b757ab64411ab600017b)

# 2103.05735
- https://arxiv.org/abs/2103.05735
- **The variable absorption in the X-ray spectrum of GRB 190114C**
- GRB 190114C was a bright burst first ever detected at TeV energies. The authors join 15 SWIFT, NuSTAR and XMM-Newton X-ray observations. They found the absorbed column density of the X-ray spectra decreases by a factor of 2 over ~ 10 days. The absorption variability cannot be well-modeled by the breakout of photoionzation of mediums along l.o.s. The authors inteprete it as a clumpy absorber surrounded by low-density gas along l.o.s. Late GRB photons may travel from a larger opening angle.
- ![cartoon](https://leanote.com/api/file/getImage?fileId=6049b757ab64411ab600017a)

# 2103.06156
- https://arxiv.org/abs/2103.06156
- **High resolution soft X-ray spectroscopy and the quest for the hot (5-10 MK) plasma in solar active regions**

# 2103.05728
- https://arxiv.org/abs/2103.05728
- **SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state**

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