| Apr. 1, 2025 | With the start of the new academic year, we have welcomed the following individuals to our team: as first-year students in the Master's Programme, Mr. Kanta Aimoto, Ms. Mayuka Oda, Ms. Michi Shinozaki, Mr. Yoshitomo Takahashi, and Mr. Akifumi Takayama; and as graduation research students, Ms. Maria Arima, Mr. Yasunari Nomura, and Mr. Kenta Hagiwara. |
| Mar. 27, 2025 | The co-authored paper titled "Simultaneous Formation of the Andromeda Giant Southern Stream and the Substructures in the Andromeda Halo" by Misa Yamaguchi (Univ. Tsukuba), Takatoshi Kirihara (Kitami Institute of Technology), Yohei Miki (Univ. Tokyo), Tatsuki Kogami (SOKENDAI), Masashi Chiba (Tohoku University), Yu Komiyama (Hosei Univ.), and Mikito Tanaka (Hosei Univ.) has been accepted for publication in the PASJ. [arXiv:2503.21217] |
| Mar. 25, 2025 | Michi Shinozaki (U. Grads), a fourth-year student in the Department of Physics, received a student award (President's Award) for her graduation thesis titled "Critical Conditions for the Cusp-Core Transition of Dark Matter Halos." Congratulations! |
| Mar. 25, 2025 | This year, we have sent off two graduate students and three undergraduate students |
| Mar. 17-20, 2025 | We participated in the 2025 Spring Meeting of the Astronomical Society of Japan (Mito city, Ibaraki), where Yuka Kaneda (PhD), Misa Yamaguchi (Grads), and Michi Shinozaki (U. Grads) presented their latest research findings. |
| Feb. 5, 2025 | Graduation thesis of Michi Shinozaki, "Critical Conditions for the Cusp-Core Transition in Dark Matter Halos," was awarded the Best Presentation Award at the graduation research presentation. Congratulations! |
| Feb. 14, 2025 | The master's thesis defences of Misa Yamaguchi and Takuhiro Yuasa have been successfully completed.
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| Feb. 7, 2025 | A student from our team has produced the third instalment in our recent research series: "Is the Cold Dark Matter Hypothesis Correct?: Dark Matter Halo Detection via Stellar Stream Traces." According to the leading candidate for dark matter, the cold dark matter hypothesis, a vast number of dwarf galaxy-sized dark matter haloes devoid of stars are predicted to surround massive galaxies such as the Milky Way and Andromeda. However, these dark satellites remain undiscovered. In this study, they propose a new method to detect these invisible dark matter haloes by utilising distinctive features in stellar streams. |
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| Feb. 5, 2025 | The graduation research presentations by Kanta Aimoto, Michi Shinozaki, Akifumi Takayama, and Ryuoh Fujinomaki have been successfully completed.
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| Feb. 4, 2025 | A student from our team has produced the third instalment in our recent research series: "Galaxy Collision and Evolution: Dark Matter and the Tears of Andromeda." In the neighbouring Andromeda Galaxy - right beside our Milky Way - an ongoing galactic collision is taking place. Countless stellar remnants, scattered by the impact, have formed a vast stream of light known as the "Tears of Andromeda." Recent findings suggest that dark matter plays a crucial role in the formation of these "Tears of Andromeda." |
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| Jan. 27, 2025 | One of our team's students has produced the third instalment in our recent research series: "Frontline Research: Can Stars Form Between Galaxies? - The Formation of Dwarf Galaxies and Young Star Clusters in the M81 Galaxy Group." Beyond Ursa Major, approximately 12 million light-years away in the depths of space, lies a group of spiral galaxies. Within the space between them, dazzling clusters of young stars have been discovered. Were they once torn from a nearby spiral galaxy, or did they emerge from the darkness between galaxies? We explore this long-standing mystery. |
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| Jan. 16, 2025 | We had a celebration for Dr. Yohei Miki (Ph.D., class of 2014) and a New Year party.
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| Jan. 10, 2025 | We submitted a co-authored paper entitled "Simultaneous Formation of the Andromeda Giant Southern Stream and Eastern Extent," in collaboration with Misa Yamaguchi (Second-year master's student), Takanobu Kirihara (Kitami Institute of Technology), Yohei Miki (The University of Tokyo), Itsuki Kogami (SOKENDAI), Masashi Chiba (Tohoku University), Yu Komiyama (Hosei University), and Mikito Tanaka (Hosei University).
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| Dec. 26, 2024 | We submitted a co-authored paper with Yuka Kaneda (Second-year Ph.D. student), Yohei Miki (The University of Tokyo), Takanobu Kirihara (Kitami Institute of Technology), and Andreas Burkert (Ludwig Maximilian University of Munich).
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| Dec. 19, 2024 | The midterm evaluations of the graduation research projects by Kanta Aimoto (12/11), Michi Shinozaki (12/12), Akifumi Takayama (12/19), and Ryuoh Fujinomaki (12/19) have been successfully completed.
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| 2Dec. 9, 2024 | A co-authored paper with Itsuki Kogami (SOKENDAI), titled "The Structure of the Stellar Halo of the Andromeda Galaxy Explored with the NB515 for Subaru/HSC. I: New Insights on the Stellar Halo up to 120 kpc," was published in Monthly Notices of the Royal Astronomical Society.
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| Dec. 4, 2024 | The midterm review of the master's thesis by Takahiro Yuasa (Master's second-year student) has been successfully completed.
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| Nov. 27, 2024 | The midterm review of the master's thesis by Misa Yamaguchi (Master's second-year student) has been successfully completed.
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| Nov. 5-8, 2024 | We participated in the "School-type Workshop: Dark Matter and Its Exploration in the Universe," held at Yokohama National University, and presented the latest research findings of Yuka Kaneda (second-year Ph.D. student) and Michi Shinozaki (final-year undergraduate student).
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| Nov. 1, 2024 | Dr. Yohei Miki (Ph.D., class of 2014) has embarked on a new role as an Associate Professor at the Information Technology Center, the University of Tokyo.
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| Oct, 29, 2024 | A paper co-authored with Yudai Kazuno, who completed his master's degree in March 2023, entitled 'Cosmological Evolution of Dark Matter Subhaloes under Tidal Stripping by Growing Milky Way-like Galaxies,' has been accepted for publication in the Publications of the Astronomical Society of Japan.
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| Sep. 26-27, 2024 | Misa Yamaguchi(Second-year master's student) and I participated in the workshop "The Violent Universe" held at the National Astronomical Observatory of Japan and presented our recent research findings.
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| Sep. 11-13, 2024 | We attended the 2024 Autumn Meeting of the Astronomical Society of Japan at Sanda Campus, Kwansei Gakuin University in Hyogo Prefecture. Our group presented recent research on dark matter haloes and the Andromeda Giant Stream. We also held a collaborative meeting with colleagues from Tohoku University, the National Astronomical Observatory of Japan, Hosei University, and the University of Tokyo to discuss our new joint research.
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| Aug. 30, 2024 | A paper co-authored with Yudai Kazuno, who completed his master's degree in March 2023, entitled 'Cosmological Evolution of Dark Matter Subhaloes under Tidal Stripping by Growing Milky Way-like Galaxies,' has been submitted to the Publications of the Astronomical Society of Japan.
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| Aug. 30, 2024 | Koki Otaki (currently a postdoctoral researcher at Kagoshima University), who completed his PhD in March this year, is leaving for his new position as a researcher at Sapienza, Universita di Roma. To mark the occasion, both current and former members of the Mori Group gathered in Tsukuba for a memorable farewell party.
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| Aug. 5, 2024 | We had a meeting at the Kashiwa campus of the University of Tokyo to discuss our new project.
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| Jul. 30, 2024 | "Novel Individual Timestep Integrator with Symplectic Property using Hamiltonian Splitting for SPH" by Yuasa, Takuhiro; Mori, Masao; Miki, Yohei, has been submitted to Astrophysical Journal.
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| Jul. 25, 2024 | Today, we had approximately 150 visitors at our booth during the Tsukuba University Open Campus. Visitors had the opportunity to experience our galaxy collision simulation and touched on the latest achievements of our research.
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| Jul. 19, 2024 | We had a meeting for collaborative research with Prof. Sakurako Okamoto from the National Astronomical Observatory of Japan, Hawaii Observatory. A new field of research has begun, and I am very excited about the future developments.
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| Jul. 16, 2024 | "Accelerated Hermite integrator for orbital integration with OpenACC" by Otaki, Koki; Mori, Masao; Miki, Yohei; Takahashi, Daisuke, has been submitted to Computer Physics Communications.
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| Jul. 15, 2024 | "A universal scaling relation incorporating the cusp-to-core transition of dark matter haloes" by Kaneda, Yuka; Mori, Masao; Otaki, Koki, has been accepted for publication in PASJ.
The paper reveals the origin of the scaling laws observed in dark matter haloes associated with galaxies and galaxy clusters. It discusses their relation to the cusp-core problem in the cold dark matter model."
[arXiv:2407.03614]
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| Jul. 8, 2024 | Our paper titled "A Universal Scaling Relation Incorporating the Cusp-to-Core Transition of Dark Matter Haloes," authored by Yuka Kaneda, MM, and Koki Otaki, is currently under review in the PASJ journal. In the meantime, we have also made it available as a preprint on arXiv.
[arXiv:2407.03614]
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| Jul. 7, 2024 | "Novel hydrodynamic schemes capturing shocks and contact discontinuities and comparative study with existing methods" by Takuhiro Yuasa and MM has been published in New Astronomy.
The paper is about a new SPH method developed to accurately solve shock waves and contact discontinuities in compressible hydrodynamic simulations.
[New Astronomy / arXiv:2312.03224v3]
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| Jul. 2, 2024 | An interview with Yuka Kaneda, recorded during the IAU Symposium "Dynamical Masses of Local Group Galaxies" in Potsdam last year, has been uploaded to YouTube. In the interview (8:35-10:14), she explains the cusp-core problem in cold dark matter halos.
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| Jun 29, 2024 | SCUTA (Sport Climbing Club at the University of Tsukuba, Astrophysics) members tried lead climbing for the first time. |
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| May 20, 2024 | Misa Yamaguchi's "The report on participation in an international symposium, funded by the Hayakawa Yukio Fund of the Astronomical Society of Japan, was published in the June issue of the Astronomical Monthly Report.
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| May 12, 2024 | At the Yukari-no-Mori Garden, we had a joint welcome party for newcomers to the astrophysics group, both in theory and observation.Seven guys from our group took part in the event, where they enjoyed a BBQ and got to know other group members. |
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| Apr. 22, 2024 | We're excited to welcome four new members to our team: Kanta Aimoto, Michi Shinozaki, Akifumi Takayama, and Ryuoh Fujinomaki.
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| Apr. 20, 2024 | Koki Otaki's "The report on participation in an international symposium, funded by the Hayakawa Yukio Fund of the Astronomical Society of Japan, was published in the May issue of the Astronomical Monthly Report.
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| Apr. 1, 2024 | We're pleased to welcome first-year Master's student Taisei Takeuchi to our team. Additionally, Takanobu Kirihara, who graduated from our team in 2017, has taken up the position of Associate Professor at the Kitami Institute of Technology.
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| Mar. 31, 2024 | Kazuma Koyata, Second-year master's student, has graduated and emloyed by a private company. Koki Otaki, third-year Ph.D. student, has moved to Kagoshima University as a postdoctoral researcher and will transfer to the University of Rome shortly.
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| Mar. 26, 2024 | I have been in Germany since March 12th. Today, I returned to Japan after holding joint research meetings with Prof. Andreas Burkert from the Max-Planck Institute for Extraterrestrial Physics and Prof. Andreas Koch from the Astronomisches Rechen-Institut at the University of Heidelberg. |
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| Mar. 12, 2024 | I will be visiting Germany for approximately two weeks to attend collaborative research meetings at the Max-Planck Institute for Extraterrestrial Physics, the University Observatory at Ludwig-Maximilians-Universitaet Muenchen, and the Astronomisches Rechen-Institut at Heidelberg University.
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| Mar. 11, 2024 | I participated in the "Formation and evolution of galaxies and galaxy systems revealed by Subaru PFS" session at the Japan Astronomical Society 2024 Spring Meeting held at the University of Tokyo, Hongo. During this session, Koki Otaki (third-year Ph.D. student), Yuka Kaneda (First-year Ph.D. student), Misa Yamaguchi (First-year master's student), and I presented our recent research findings.
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| Mar. 9, 2024 | Yuka Kaneda (First-year Ph.D. student) and MM participated in the "Formation and evolution of galaxies and galaxy systems revealed by Subaru PFS: Satellite Workshop" held at the National Astronomical Observatory of Japan.
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| Mar. 1, 2024 | I participated in the "Dark Matter in the Universe: The Present and Future of Galactic Archaeology and Near-field Cosmology" held at Matsushima Century Hotel (Miyagi Prefecture, Matsushima) for three days, where MM, Koki Otaki (third-year Ph.D. student), Yuka Kaneda (First-year Ph.D. student), and Misa Yamaguchi (First-year master's student) presented their research findings.
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| Feb. 21, 2024 | Koki Otaki (third-year Ph.D. student) successfully defended his doctoral dissertation titled "Formation of Dwarf Galaxies Induced by Dark Matter Subhalo Collisions".
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| Feb. 15, 2024 | Takuhiro Yuasa (First-year master's student)'s paper on the development of a new SPH method titled "Novel hydrodynamic schemes capturing shocks and contact discontinuities and comparison study with existing methods" has been accepted by New Astronomy.
[arXiv:2312.03224]
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| Feb. 15, 2024 | Kazuma Koyata (Second-year master's student) successfully defended his master's thesis titled "Hydrodynamic Interactions in Collisions between Dwarf Galaxies and Galactic Disks".
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| Jan. 31, 2024 | Taisei Takeuchi (Fourth-year undergraduate student) successfully defended his undergraduate thesis titled "Toward the Study of Galaxy Collisions and Hydrodynamic Interactions".
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