RESEARCH

Research Clusters

Study of First-Generation Objects in the Universe with Radio Telescopes

Research Keyword: radio astronomy, big data, machine learning, AI

It is predicted that the first astronomical objects in the 13.8-billion-year history of the Universe were formed around 100 million years after the birth of the Universe, but there is still no observational evidence to support this. The 21 cm radio lines from neutral hydrogen atoms, which filled the Universe at that time and were the material for the formation of astronomical objects, are the focus of this research, and radio telescopes are used to detect them in order to search for the first astronomical objects in the Universe.

Study of First-Generation Objects in the Universe with Radio Telescopes

Cluster members

  • Japan
    Coordinator
    Keitaro TAKAHASHI

    Professor
    Faculty of Advanced Science and Technology, Kumamoto University

    Japan
  • Australia
    Rachel WEBSTER

    Professor
    The University of Melbourne

    Australia
  • Australia
    Bart PINDOR

    Professor
    The University of Melbourne

    Australia
  • Japan
    Shintaro YOSHIURA

    JSPS Researcher
    National Astronomical Observatory of Japan

    Japan
  • Japan
    Takuya AKAHORI

    Researcher
    National Astronomical Observatory of Japan

    Japan
  • Japan
    Takeshi FUKUSAKO

    Professor
    Faculty of Advanced Science and Technology, Kumamoto University

    Japan
  • Japan
    Ryo KATO

    Researcher
    Faculty of Advanced Science and Technology, Kumamoto University

    Japan

Achievement

Publications
in press
  • The second data release from the European Pulsar Timing Array: V. Implications for massive black holes, dark matter and the early Universe
    J. Antoniadis, P. Arumugam, S. Arumugam, P. Auclair, S. Babak, M. Bagchi, A.-S. Bak Nielsen, E. Barausse, C. G. Bassa, A. Bathula, A. Berthereau, M. Bonetti, E. Bortolas, P. R. Brook, M. Burgay, R. N. Caballero, C. Caprini, A. Chalumeau, D. J. Champion, S. Chanlaridis, S. Chen, I. Cognard, M. Crisostomi, S. Dandapat, D. Deb, S. Desai, G. Desvignes, N. Dhanda-Batra, C. Dwivedi, M. Falxa, F. Fastidio, R. D. Ferdman, A. Franchini, J. R. Gair, B. Goncharov, A. Gopakumar, E. Graikou, J.-M. Grießmeier, A. Gualandris, L. Guillemot, Y. J. Guo, Y. Gupta, S. Hisano, H. Hu, F. Iraci, D. Izquierdo-Villalba, J. Jang, J. Jawor, G. H. Janssen, A. Jessner, B. C. Joshi, F. Kareem, R. Karuppusamy, E. F. Keane, M. J. Keith, D. Kharbanda, T. Khizriev, T. Kikunaga, N. Kolhe, M. Kramer, M. A. Krishnakumar, K. Lackeos, K. J. Lee, K. Liu, Y. Liu, A. G. Lyne, J. W. McKee, Y. Maan, R. A. Main, M. B. Mickaliger, H. Middleton, A. Neronov, I. C. Nitu, K. Nobleson, A. K. Paladi, A. Parthasarathy, B. B. P. Perera, D. Perrodin, A. Petiteau, N. K. Porayko, A. Possenti, T. Prabu, K. Postnov, H. Quelquejay Leclere, P. Rana, A. Roper Pol, A. Samajdar, S. A. Sanidas, D. Semikoz, A. Sesana, G. Shaifullah, J. Singha, C. Smarra, L. Speri, R. Spiewak, A. Srivastava, B. W. Stappers, D. A. Steer, M. Surnis, S. C. Susarla, A. Susobhanan, K. Takahashi, P. Tarafdar, G. Theureau, C. Tiburzi, R. J. Truant, E. van der Wateren, S. Valtolina, A. Vecchio, V. Venkatraman Krishnan, J. P. W. Verbiest, J. Wang, L. Wang, Z. Wu 
    Astronomy & Astrophysics  
2024
  • A search for auroral radio emission from β Pictoris b
    Avinash Kumar Paladi, Churchil Dwivedi, Prerna Rana, Nobleson K, Abhimanyu Susobhanan, Bhal Chandra Joshi, Pratik Tarafdar, Debabrata Deb, Swetha Arumugam, A Gopakumar, M A Krishnakumar, Neelam Dhanda Batra, Jyotijwal Debnath, Fazal Kareem, Paramasivan Arumugam, Manjari Bagchi, Adarsh Bathula, Subhajit Dandapat, Shantanu Desai, Yashwant Gupta, Shinnosuke Hisano, Divyansh Kharbanda, Tomonosuke Kikunaga, Neel Kolhe, Yogesh Maan, P K Manoharan, Jaikhomba Singha, Aman Srivastava, Mayuresh Surnis, Keitaro Takahashi
    Monthly Notices of the Royal Astronomical Society, 528, 2, pp.2136-2144 (2024)
  • The second data release from the European Pulsar Timing Array IV. Implications for massive black holes, dark matter, and the early Universe
    J. Antoniadis, P. Arumugam, S. Arumugam, S. Babak, M. Bagchi, A. S. Bak Nielsen, C. G. Bassa, A. Bathula, A. Berthereau, M. Bonetti, E. Bortolas, P. R. Brook, M. Burgay, R. N. Caballero, A. Chalumeau, D. J. Champion, S. Chanlaridis, S. Chen, I. Cognard, S. Dandapat, D. Deb, S. Desai, G. Desvignes, N. Dhanda-Batra, C. Dwivedi, M. Falxa, I. Ferranti, R. D. Ferdman, A. Franchini, J. R. Gair, B. Goncharov, A. Gopakumar, E. Graikou, J. M. Grießmeier, L. Guillemot, Y. J. Guo, Y. Gupta, S. Hisano, H. Hu, F. Iraci, D. Izquierdo-Villalba, J. Jang, J. Jawor, G. H. Janssen, A. Jessner, B. C. Joshi, F. Kareem, R. Karuppusamy, E. F. Keane, M. J. Keith, D. Kharbanda, T. Kikunaga, N. Kolhe, M. Kramer, M. A. Krishnakumar, K. Lackeos, K. J. Lee, K. Liu, Y. Liu, A. G. Lyne, J. W. McKee, Y. Maan, R. A. Main, S. Manzini, M. B. Mickaliger, I. C. Nitu, K. Nobleson, A. K. Paladi, A. Parthasarathy, B. B. P. Perera, D. Perrodin, A. Petiteau, N. K. Porayko, A. Possenti, T. Prabu, H. Quelquejay Leclere, P. Rana, A. Samajdar, S. A. Sanidas, A. Sesana, G. Shaifullah, J. Singha, L. Speri, R. Spiewak, A. Srivastava, B. W. Stappers, M. Surnis, S. C. Susarla, A. Susobhanan, K. Takahashi, P. Tarafdar, G. Theureau, C. Tiburzi, E. van der Wateren, A. Vecchio, V. Venkatraman Krishnan, J. P. W. Verbiest, J. Wang, L. Wang, Z. Wu
    Astronomy & Astrophysics, 685, A94, (May 2024)
  • Multi-band Extension of the Wideband Timing Technique
    Avinash Kumar Paladi, Churchil Dwivedi, Prerna Rana, Nobleson K, Abhimanyu Susobhanan, Bhal Chandra Joshi, Pratik Tarafdar, Debabrata Deb, Swetha Arumugam, A Gopakumar, M A Krishnakumar, Neelam Dhanda Batra, Jyotijwal Debnath, Fazal Kareem, Paramasivan Arumugam, Manjari Bagchi, Adarsh Bathula, Subhajit Dandapat, Shantanu Desai, Yashwant Gupta, Shinnosuke Hisano, Divyansh Kharbanda, Tomonosuke Kikunaga, Neel Kolhe, Yogesh Maan, P K Manoharan, Jaikhomba Singha, Aman Srivastava, Mayuresh Surnis, Keitaro Takahashi
    Monthly Notices of the Royal Astronomical Society, 527, 1, 213-231  
2023
  • Precision of localization of single gravitational-wave source with pulsar timing array
    Ryo KatoKeitaro Takahashi
    Phys.Rev.D 108, 12, 123535 (2023)
  • Noise analysis of the Indian Pulsar Timing Array data release I
    Aman Srivastava, Shantanu Desai, Neel Kolhe, Mayuresh Surnis, Bhal Chandra Joshi, Abhimanyu Susobhanan, Aurélien Chalumeau, Shinnosuke Hisano, Nobleson K., Swetha Arumugam, Divyansh Kharbanda, Jaikhomba Singha, Pratik Tarafdar, P Arumugam, Manjari Bagchi, Adarsh Bathula, Subhajit Dandapat, Lankeswar Dey, Churchil Dwivedi, Raghav Girgaonkar, A. Gopakumar, Yashwant Gupta, Tomonosuke Kikunaga, M. A. Krishnakumar, Kuo Liu, Yogesh Maan, P K Manoharan, Avinash Kumar Paladi, Prerna Rana, Golam M. Shaifullah, Keitaro Takahashi
    Physical Review D, 108, 2, 023008
  • The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
    J. Antoniadis, P. Arumugam, S. Arumugam, S. Babak, M. Bagchi, A.-S. Bak Nielsen, C. G. Bassa, A. Bathula, A. Berthereau, M. Bonetti, E. Bortolas, P. R. Brook, M. Burgay, R. N. Caballero, A. Chalumeau, D. J. Champion, S. Chanlaridis, S. Chen, I. Cognard, S. Dandapat, D. Deb, S. Desai, G. Desvignes, N. Dhanda-Batra, C. Dwivedi, M. Falxa, R. D. Ferdman, A. Franchini, J. R. Gair, B. Goncharov, A. Gopakumar, E. Graikou, J.-M. Grießmeier, L. Guillemot, Y. J. Guo, Y. Gupta, S. Hisano, H. Hu, F. Iraci, D. Izquierdo-Villalba, J. Jang, J. Jawor, G. H. Janssen, A. Jessner, B. C. Joshi, F. Kareem, R. Karuppusamy, E. F. Keane, M. J. Keith, D. Kharbanda, T. Kikunaga, N. Kolhe, M. Kramer, M. A. Krishnakumar, K. Lackeos, K. J. Lee, K. Liu, Y. Liu, A. G. Lyne, J. W. McKee, Y. Maan, R. A. Main, M. B. Mickaliger, I. C. Nitu, K. Nobleson, A. K. Paladi, A. Parthasarathy, B. B. P. Perera, D. Perrodin, A. Petiteau, N. K. Porayko, A. Possenti, T. Prabu, H. Quelquejay Leclere, P. Rana, A. Samajdar, S. A. Sanidas, A. Sesana, G. Shaifullah, J. Singha, L. Speri, R. Spiewak, A. Srivastava, B. W. Stappers, M. Surnis, S. C. Susarla, A. Susobhanan, K. Takahashi, P. Tarafdar, G. Theureau, C. Tiburzi, E. van der Wateren, A. Vecchio, V. Venkatraman Krishnan, J. P. W. Verbiest, J. Wang, L. Wang, Z. Wu
    Astronomy and Astrophysics, 678, A50 (2023)
  • The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves
    J. Antoniadis, P. Arumugam, S. Arumugam, S. Babak, M. Bagchi, A. S. Bak Nielsen, C. G. Bassa, A. Bathula, A. Berthereau, M. Bonetti, E. Bortolas, P. R. Brook, M. Burgay, R. N. Caballero, A. Chalumeau, D. J. Champion, S. Chanlaridis, S. Chen, I. Cognard, S. Dandapat, D. Deb, S. Desai, G. Desvignes, N. Dhanda-Batra, C. Dwivedi, M. Falxa, R. D. Ferdman, A. Franchini, J. R. Gair, B. Goncharov, A. Gopakumar, E. Graikou, J.-M. Grießmeier, L. Guillemot, Y. J. Guo, Y. Gupta, S. Hisano, H. Hu, F. Iraci, D. Izquierdo-Villalba, J. Jang, J. Jawor, G. H. Janssen, A. Jessner, B. C. Joshi, F. Kareem, R. Karuppusamy, E. F. Keane, M. J. Keith, D. Kharbanda, T. Kikunaga, N. Kolhe, M. Kramer, M. A. Krishnakumar, K. Lackeos, K. J. Lee, K. Liu, Y. Liu, A. G. Lyne, J. W. McKee, Y. Maan, R. A. Main, M. B. Mickaliger, I. C. Niţu, K. Nobleson, A. K. Paladi, A. Parthasarathy, B. B. P. Perera, D. Perrodin, A. Petiteau, N. K. Porayko, A. Possenti, T. Prabu, H. Quelquejay Leclere, P. Rana, A. Samajdar, S. A. Sanidas, A. Sesana, G. Shaifullah, J. Singha, L. Speri, R. Spiewak, A. Srivastava, B. W. Stappers, M. Surnis, S. C. Susarla, A. Susobhanan, K. Takahashi, P. Tarafdar, G. Theureau, C. Tiburzi, E. van der Wateren, A. Vecchio, V. Venkatraman Krishnan, J. P. W. Verbiest, J. Wang, L. Wang, Z. Wu
    Astronomy and Astrophysics, 678, id.A49, 20 pp., 10/2023
  • Introduction to Faraday tomography and its future prospects
    Publications of the Astronomical Society of Japan, psac111,Volume 75, Issue Supplement_1, February 2023, Pages S50–S84
  • Wavelets and sparsity for Faraday tomography
    Suchetha Cooray, Tsutomu T. Takeuchi, Shinsuke Ideguchi, Takuya Akahori, Yoshimitsu Miyashita, Keitaro Takahashi
    Publications of the Astronomical Society of Japan, Volume 75, Issue Supplement_1, February 2023, pp.S85-S96
  • Testing the non-circularity of the spacetime around Sagittarius A* with orbiting pulsars
    Yohsuke TAKAMORI, Atsushi NARUKO, Yusuke SAKURAI, Keitaro TAKAHASHI, Daisuke YAMAUCHI, and Chul-Moon Yoo
    Publications of the Astronomical Society of Japan, 75, Supplement_1, PP S217–S231 (2023)
    *Added Volume number on May 23, 2023
2022
  • Nanohertz gravitational wave astronomy during SKA era: An InPTA perspective
    Bhal Chandra Joshi, Achamveedu Gopakumar, Arul Pandian, Thiagaraj Prabu, Lankeswar Dey, Manjari Bagchi, Shantanu Desai, Pratik Tarafdar, Prerna Rana, Yogesh Maan, Neelam Dhanda BATRA, Raghav Girgaonkar, Nikita Agarwal, Paramasivan Arumugam, Avishek Basu, Adarsh Bathula, Subhajit Dandapat, Yashwant Gupta, Shinnosuke Hisano, Ryo Kato, Divyansh Kharbanda, Tomonosuke Kikunaga, Neel Kolhe, M. A. Krishnakumar, P. K. Manoharan, Piyush Marmat, Arun Naidu, Sarmistha Banik, K. Nobleson, Avinash Kumar Paladi, Dhruv Pathak, Jaikhomba Singha, Aman Srivastava, Mayuresh Surnis, Sai Chaitanya Susarla, Abhimanyu Susobhanan & Keitaro Takahashi
    Journal of Astrophysics and Astronomy, 43 (2022), 98
  • On the Potential of Faraday Tomography to Identify Shock Structures in Supernova Remnants
    Shinsuke Ideguchi, Tsuyoshi Inoue, Takuya Akahori and Keitaro Takahashi
    Monthly Notices of the Royal Astronomical Society, 513, 3, 3289-3301, 07/2022
  • The Indian Pulsar Timing Array: First data release
    Pratik Tarafdar, K Nobleson, Prerna Rana, Jaikhomba Singha, M. A. Krishnakumar, Bhal Chandra Joshi, Avinash Kumar Paladi, Neel Kolhe, Neelam Dhanda Batra, Nikita Agarwal, Adarsh Bathula, Subhajit Dandapat, Shantanu Desai, Lankeswar Dey, Shinnosuke Hisano, Prathamesh Ingale, Ryo Kato, Divyansh Kharbanda, Tomonosuke Kikunaga, Piyush Marmat, B. Arul Pandian, T. Prabu, Aman Srivastava, Mayuresh Surnis, Sai Chaitanya Susarla, Abhimanyu Susobhanan, Keitaro Takahashi, P. Arumugam, Manjari Bagchi, Sarmistha Banik, Kishalay De, Raghav Girgaonkar, A. Gopakumar, Yashwant Gupta, Yogesh Maan, P. K. Manoharan, Arun Naidu and Dhruv Pathak
    Publications of the Astronomical Society of Australia, 39, e053 (2022)
  • Low-frequency wideband timing of InPTA pulsars observed with the uGMRT
    K Nobleson, Nikita Agarwal, Raghav Girgaonkar, Arul Pandian, Bhal Chandra Joshi, M A Krishnakumar, Abhimanyu Susobhanan, Shantanu Desai, T Prabu, Adarsh Bathula, Timothy T Pennucci, Sarmistha Banik, Manjari Bagchi, Neelam Dhanda Batra, Arpita Choudhary, Subhajit Dandapat, Lankeswar Dey, Yashwant Gupta, Shinnosuke Hisano, Ryo Kato, Divyansh Kharbanda, Tomonosuke Kikunaga, Neel Kolhe, Yogesh Maan, Piyush Marmat, P Arumugam, P K Manoharan, Dhruv Pathak, Jaikhomba Singha, Mayuresh P Surnis, Sai Chaitanya Susarla, Keitaro Takahashi
    Monthly Notices of the Royal Astronomical Society, 512, 1, 1234-1243, 05/2022
  • A Parkes "Murriyang" Search for Pulsars and Transients in the Large Magellanic Cloud
    Shinnosuke Hisano, Fronefield Crawford, Victoria Bonidie, Md F. Alam, Keitaro Takahashi, Duncan R. Lorimer, Josh P. Ridley, Maura M. McLaughlin, Benetge B. P. Perera
    Astrophysical Journal, 928, Number 2, 161, 2022
Publications
Grants
  • 科学研究費補助金基盤研究B(2021年度〜2024年度)
  • 科学研究費補助金学術変革領域A公募研究(2024年度〜2025年度)

  • 二国間交流事業(2023年度〜2024年度)

Activities

  •  Busy Week event by the Indian Pulsar Timing Array (InPTA) in Chennai, India -February 5 to 9, 2024
    News

 

  • Group photo at a meeting in Chennai, India -  February, 2023 -

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