Multi-wavelength Investigations of Galaxy-Hot Plasma Interactions in Clusters of Galaxies

• Project/Area Number: 25887013
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: 顧 力意 東京大学, 理学(系)研究科(研究院), 研究員 (20713308)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Project Status: Discontinued (Fiscal Year 2014)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: X-ray astrophysics / optical astronomy / cosmology / plasma physics / 国際研究者交流 / astronomy

Outline of Annual Research Achievements

We have continued and extended the research topic, the cosmological infall of galaxies into the centre of galaxy clusters (originally proposed by Makishima et al. 2001), by carrying out a much more comprehensive study on the three main mass components i.e., galaxies, hot ICM, and dark matter, in the galaxy clusters.
In collaborating with optical astronomers (Prof. Han and Dr. Wen) in National Observatory of China, we compiled a sample of 340 galaxy clusters in redshift range of 0.1-0.5. The size of the sample is 10 times as the one used in Gu et al. (2013). In this work I played a central role in analyzing both X-ray and optical data. We have detected, following Gu et al. (2013), a significant evolution on a cosmological timescale: galaxies have been centrally concentrated with time relative to the ICM and dark matter, while the ICM has been expanding compared to dark matter even they keep radiating. This evolution is not solely driven by gravitational effects such as dynamical friction between galaxies and cluster matters. The result will be submitted soon to the Astrophysical Journal.

References: Makishima, K. et al. 2001, PASJ, 53, 401; Gu, L. et al. 2013, ApJ, 767, 157; Gu, L. et al. 2014, in prep.

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Discovery of nine extended ionized gas clouds in a z=0.4 cluster (2015)
  • Author(s): Yagi, M., Gu, L., Koyama, Y., Nakata, F., Kodama, T., Hattori, T., Yoshida, M.
  • Journal Title: Astronomy Journal Volume: in press
  • Peer Reviewed
• [Journal Article] Joint XMM-Newton and Chandra Observations of the NGC 1407/1400 Complex: a Tail of an Early-Type Galaxy and a Tale of a Nearby Merging Group (2014)
  • Author(s): Su, Y., Gu, L., White, R. III, Irwin, J.
  • Journal Title: The Astrophysical Journal Volume: in press
  • Peer Reviewed
• [Journal Article] Probing of the Interactions between the Hot Plasmas and Galaxies in Clusters from z = 0.1 to 0.9 (2013)
  • Author(s): Gu, Liyi
  • Journal Title: Astrophysical Journal Volume: 767 Issue: 2 Pages: 157-186
  • DOI: 10.1088/0004-637x/767/2/157
  • Peer Reviewed
• [Journal Article] Search for galaxy-ICM interaction in rich clusters of galaxies (2013)
  • Author(s): Gu, L.; Gandhi, P.; Inada, N.; Kawaharada, M.; Kodama, T.; Konami, S.; Nakazawa, K.; Shimasaku, K.; Xu, Haiguang; Makishima, K.
  • Journal Title: Astronomische Nachrichten Volume: 334 Issue: 4-5 Pages: 453-457
  • DOI: 10.1002/asna.201211879
  • Peer Reviewed
• [Journal Article] Multi-wavelength Studies of Spectacular Ram Pressure Stripping of a Galaxy: Discovery of an X-Ray Absorption Feature (2013)
  • Author(s): Gu, L., Yagi, M., Nakazawa, K., Yoshida, M., Fujita, Y., Hattori, T., Akahori, T., and Makishima, K.
  • Journal Title: The Astrophysical Journal Letters Volume: 777 Issue: 2 Pages: 36-36
  • DOI: 10.1088/2041-8205/777/2/l36
  • Peer Reviewed
• [Journal Article] Multi-wavelength Studies of Spectacular Ram-pressure Stripping of a Galaxy. II. Star Formation in the Tail (2013)
  • Author(s): Yagi, M., Gu, L., Fujita, Y., Nakazawa, K., Akahori, T., Hattori, T., Yoshida, M., and Makishima, K.
  • Journal Title: The Astrophysical Journal Volume: 778 Issue: 2 Pages: 91-91
  • DOI: 10.1088/0004-637x/778/2/91
  • Peer Reviewed
• [Presentation] the Important Role of Dark Matter Halo in Retaining Hot Gas Content in Early-Type Galaxies (2014)
  • Author(s): Su, Y., Irwin, J., White, R., Buote, D., Gu, L.
  • Organizer: American Astronomical Society, HEAD meeting
  • Place of Presentation: Chicago, US
  • Year and Date: 2014-08-17 – 2014-08-21
• [Presentation] Probing of Interactions between the Hot Plasmas and Galaxies in Clusters over a Cosmological Timescale (2014)
  • Author(s): Gu, L., Makishima, K.
  • Organizer: X-ray Universe 2014
  • Place of Presentation: Dublin, Ireland
  • Year and Date: 2014-06-16 – 2014-06-19
• [Presentation] Probing of the Interactions Between the Hot Plasmas and Galaxies in Clusters over a Cosmological Timescale (2014)
  • Author(s): Gu, L., Gandhi, P., Inada, N., Kawaharada, M., Kodama, T., Konami, S., Nakazawa, K., Shimasaku, K., Xu, H., Makishima, K.
  • Organizer: Suzaku-MAXI Conference 2014: Expanding the Frontiers of the X-ray Universe
  • Place of Presentation: Ehime University, Ehime-ken
  • Invited
• [Presentation] Probing of the Interactions Between the Hot Plasmas and Galaxies in Clusters (2013)
  • Author(s): Gu, L., Gandhi, P., Inada, N., Kawaharada, M., Kodama, T., Konami, S., Nakazawa, K., Shimasaku, K., Xu, H., Makishima, K.
  • Organizer: 「銀河団の物理」ワークショップ
  • Place of Presentation: Tokyo University of Science
  • Invited
• [Presentation] Probing of the Interactions Between the Hot Plasmas and Galaxies in Clusters (2013)
  • Author(s): Gu, L., Gandhi, P., Inada, N., Kawaharada, M., Kodama, T., Konami, S., Nakazawa, K., Shimasaku, K., Xu, H., Makishima, K.
  • Organizer: SKA-Japan science conference
  • Place of Presentation: Mizusawa, Iwate-ken
  • Invited
• [Presentation] Probing of the Interactions Between the Hot Plasmas and Galaxies in Clusters (2013)
  • Author(s): Gu, L., Gandhi, P., Inada, N., Kawaharada, M., Kodama, T., Konami, S., Nakazawa, K., Shimasaku, K., Xu, H., Makishima, K.
  • Organizer: Astrophysics Colloquium
  • Place of Presentation: Durham University, UK
• [Presentation] Investigation of Interactions Between Hot Plasmas and Galaxies in Clusters IV (2013)
  • Author(s): Gu, L., Gandhi, P., Inada, N., Kawaharada, M., Kodama, T., Konami, S., Nakazawa, K., Shimasaku, K., Xu, H., Makishima, K.
  • Organizer: Annual meeting of Astronomical Society of Japan
  • Place of Presentation: Tohoku University, Miyagi-ken