| 研究実績の概要 |
During the last FY, Dr. Hu published three first-author journal papers, three collaborating papers, and two non-refereed publications. We have finished studies in the pulse profile of magnetars to infer the surface temperature distribution, and the pilot study of a super-critical accreting source SMC X-1 to reveal the spin-superorbital connection in this extreme system. In searching for pulsation and orbital modulation in extragalactic sources, we have developed a GPU-based algorithm. The first trial run has found dips in M51 ULX-7, which is the first dipping pulsating ultraluminous X-ray source (ULXs). We are now drafting the paper and will submit it to Nature Astronomy soon. We joined collaborations in studying the X-ray spectroscopy of the most extreme ULX, the timing property of a gamma-ray pulsar, and an X-ray emitting contact binary.
Dr. Hu attended two conferences and gave oral presentations, and was invited to give colloquiums in three institutes. He presented his study in SMC X-1 in the ASROC meeting in Taiwan, and in "The Future of X-ray Timing" in the Netherlands. Except for the high-energy astrophysics, he developed a few time-frequency analysis tools that are successfully used in analyzing gravitational wave data. Dr. Hu presented corresponding studies in two institutes in Taiwan.
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| 今後の研究の推進方策 |
We will submit a few papers recently. The first one is the discovery of dips of M51 ULX-7. We have submitted a pre-submission inquiry to Nature Astronomy and got invited to submit the full manuscript. The data analysis part of the multi-wavelength study (led by T. Enoto) of the giant radio pulse has been finished. We are going to submit it to Science. Dr. Hu is now leading a NICER team paper of the recently discovered magnetar Swift J1818.0-1607, and he plans to submit it to the Astrophysical Journal in a few weeks.
Besides M51 ULX-7, we also found another eclipsing binary in the same galaxy. We will summarize it and submit after the current three papers. The GPU-based algorithm will be applied to more galaxies to search for interesting sources.
For the gravitational-wave physics, Dr. Hu has analyzed the LIGO O1/O2 data and will lead a collaboration paper between Japan, Taiwan, and Korea. Furthermore, he will collaborate with theoretical astronomers working on the gravitational wave signal from core-collapse supernovae.
For the X-ray CubeSat, Dr. Hu leads the science team of the NinjaSat project (PI: T. Enoto). He has worked on simulations to test the feasibility of NinjaSat. He will use it to track continuous gravitational wave sources and the quasi-periodic oscillation signals from active galactic nuclei.
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