Welcome

We explore physics behind hot, energetic phenomena in the universe through a wide variety of telescopes including space-based X-ray observatories. Our research particularly focuses on high energy physical processes associated with supernova remnants, neutron stars, and black holes. We also develop new observational instruments for future satellite missions.

私たちは、宇宙X線観測衛星をはじめとする様々な望遠鏡の観測データを用いて、熱く激しい天体現象に潜む物理を突き止めようとしています。特に超新星残骸や中性子星・ブラックホールにおける高エネルギー物理過程を精力的に研究しています。また、将来の衛星搭載を目指して新しい観測機器の開発も進めています。

News

Event

We Hosted the International Workshop “Supernova Remnants and Their Friends in the XRISM Era”

As research results on supernova remnants using XRISM are steadily emerging, we hosted the international workshop “Supernova Remnants and Their Friends in the XRISM Era” at the University of Tokyo. The workshop featured presentations on a wide range of topics, including observations of supernova remnants with XRISM and other instruments, models of supernova explosions, and shock-wave physics. Cutting-edge findings were introduced, and participants engaged in lively and fruitful discussions.

Event

Two Guests from the University of Amsterdam Are Visiting

From September 15 to October 24, Associate Professor Jacco Vink from the University of Amsterdam is staying with the Baba Laboratory as a GSGC Visiting Associate Professor, and Mr. Manan Agawarl is staying as a Visiting Researcher. During their visit, we are discussing collaborative research projects, including the use of data from the XRISM satellite. We also hope they are enjoying their stay and life in Japan.

Paper

The paper by Mr. Masahiro Ichihashi has been accepted

The paper, “The electron temperature distribution and the high ionization just behind the shock in the Cygnus Loop”, by Masahiro Ichihashi(D3) has been accepted by ApJ. This paper analyzed the northeastern region of Cygnus Loop, one of the supernova remnants near the Earth, by XMM-Newton, the X-ray satellite with high spatial resolution. We showed that the electron temperature near the shock can be explained by the Sedov solution, the analytical solution for the temperature structure inside supernova remnants, indicating the small energy leakage near the slow shock, such as Cygnus Loop. We also showed the high ionization states just behind …

Paper

The paper by Dr. Hagino has been published in Nature.

The paper, “Structured ionized winds shooting out from a quasar at relativistic speeds,” by Dr. Hagino has been published online in Nature. In this paper, utilizing the excellent X-ray spectroscopic capability of the X-ray satellite XRISM, we discovered for the first time an unexpectedly complex velocity structure in the ultrafast outflow from the supermassive black hole PDS 456, expelling heavy ions with velocities of 30% of the speed of light. This complex velocity structure indicates a highly inhomogeneous clumpy structure of the outflow, in contrast to the previous assumption of a homogeneous flow. Considering this clumpy structure, the kinetic power …

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