2021-W23

# 2106.01696
- https://arxiv.org/abs/2106.01696
- **A Gamma-Ray Enhancement Event in Tycho's Supernova Remnant**
- authors: 陈阳 & 张潇 & ...

# 2106.03692
- https://arxiv.org/abs/2106.03692
- **Long-term X-ray evolution of SDSS J134244.4+053056.1: A more than 18 year-old, long-lived IMBH-TDE candidate**
- J134244.4+053056.1 is an optical-selected TDE candidate that may peak around 2001. The authors use XMM-Newton(2020) and SWIFT (2009) observation to analyze the follow-up spectral behavior of this source. They found soft and hard components in the spectra. The hard component showed no significant variability while the soft component slightly hardened. The X-ray flux well follows the t^(-5/3) decay of TDE light curve with a putative peak X-ray luminosity ~ 10^44 erg s^-1. The black hole mass was estimated to be ~ 10^5 M_sun via M-σ relation. So this source could be a long-lived IMBH-TDE candidate.
- by: **方正**
- 吐槽：读完感觉有点怪怪的（不是），作者其实只有两个点的X射线观测，就觉得光变曲线符合一个长时标衰减的TDE。

# 2106.04725
- https://arxiv.org/abs/2106.04725
- **Detection of a Multi-Phase Ultra-Fast Wind in the Narrow-Line Seyfert 1 Galaxy Mrk 1044**
- The authors present a detailed analysis of XMM-Newton X-ray spectra of the Narrow-Line Seyfert 1 galaxy Mrk 1044.
They find robust evidence for a multi-phase, ultra-fast outflow, traced by four separate components in the grating spectrum.
They show that in an energy-driven wind scenario, the wind in Mrk 1044 might carry enough energy to produce significant feedback on its host galaxy
- by 黄健

# 2106.05045
- https://arxiv.org/abs/2106.05045
- **Searching for Saturn's X-rays during a rare Jupiter Magnetotail Crossing using Chandra**
- by 胡祯崧

# 2106.03946
- https://arxiv.org/abs/2106.03946
- **Long-term spectra of the blazars Mrk 421 and Mrk 501 at TeV energies seen by HAWC**
- The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high energy sky in the 300 GeV to >100 TeV energy range. HAWC has detected two blazars above 11σ, Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501). The intrinsic spectrum of Mrk 421 is  a power law with an exponential energy cut-off with index α=2.26±(0.12)  and energy cut-off Ec=5.1±(1.6) TeV, while the intrinsic spectrum of Mrk 501 is a simple power law with index α=2.61±(0.11).  The maximum energies at which the Mrk 421 and Mrk 501 signals are detected are 9 and 12 TeV, respectively. This makes these some of the highest energy detections to date for spectra averaged over years-long timescales.  Contemporaneous data from the  Fermi-LAT  and literature data, in the radio to X-ray range, were used to build time-averaged SEDs that were modeled within a SSC leptonic scenario to derive the physical parameters that describe the nature of the respective jets.
- by 喻历明

# 广告时间~
- https://arxiv.org/abs/2106.04041
- **An Energetic Hot Wind from the Low-luminosity Active Galactic Nucleus M81***

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