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2021-10-21 19:51:36
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# 2110.06995 - https://arxiv.org/abs/2110.06995 - **Deep Chandra observations of diffuse hot plasma in M83** - authors: Daniel Wang # 2110.08856 - https://arxiv.org/abs/2110.08856 - **Prospect of Detecting X-Ray Halos Around Middle-Aged Pulsars with eROSITA** - local expert: **李奔** # 2110.09124 - https://arxiv.org/abs/2110.09124 - **An accreting white dwarf displaying fast transitional mode switching** - This paper report the discovery of abrupt drops in the optical luminosity by factors up to 3.5 on time-scales as short as 30 minutes, of TW Pictoris, an accreting white dwarf binary. The rapid moding timescale and large luminosity drop both indicate that the origin is associated with a sudden reduction in the mass accretion rate onto the white dwarf, which appears to be analogous to what is observed in the transitional MSPs. - by **鲍通** # 2110.06939 - https://arxiv.org/abs/2110.06939 - **X-ray spectroscopic survey of highly-accreting AGN** - by **何琳** # 2110.09540 - https://arxiv.org/abs/2110.09540 - **Astrophysical Gravitational-Wave Echoes from Galactic Nuclei** - Galactic Nuclei are abundant in Gravitational-Wave sources due to extremely high stellar number density. GWs from mergers of compact objects in the vicinity of SMBHs can be scattered by the SMBH, producing a secondary signal (astrophysical GW echo) with a time delay. In this paper, the authors examine the time-delay and detectability of these astrophysical GW echoes. They find that the time-delay is 1-100 sec mostly and 5%-30% of GW sources have echoes of 0.2-0.05 primary signal amplitude if the source distance from the SMBH is 50 r_s. - by **苏钊**
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