Astronomy and Astrophysics
The research focuses on connecting fundamental physics with astronomical observations, and aims at understanding the fundamental laws of the Universe, and unravelling the nature of dark matter and dark energy. In particular, epoch of reionization, extragalactic astronomy, the early Universe, dark matter indirect detection, neutron stars and black holes are actively investigated. The research group is also heavily involved in South Africa’s MeerKAT, Square Kilometre Array (SKA), Hydrogen Epoch of Reionization Array (HERA) telescopes, and also several international projects such as LSST (Vera C. Rubin Observatory), FAST and CMB Stage-4.
Personnel
Dr. Anslyn John (PhD: University of KwaZulu-Natal (2012))
Position: Lecturer
Interests: General Relativity, Theoretical cosmology, Relativistic Astrophysics
Tel: +27 21 808 3371
e-mail: anslyn@sun.ac.za
Office: 1028 Merensky Building
Google Scholar: Profile
Dr. Michael Sarkis (PhD: University of Witwatersrand (2023))
Interests: Dark Matter, Pulsar Timing Array
e-mail: mikedsarkis@gmail.com
Dr. Sheean Jolicoeur (PhD: University of the Western Cape (2019))
Interests: Theoretical and computational Cosmology, Forecasting algorithms (Fisher and MCMC)
e-mail: jolicoeursheean@gmail.com
Dr. Guo-Jian Wang (PhD: Beijing Normal University (2020))
Position: Postdoctoral Fellow
Interests: Machine Learning, 21-cm Cosmology
e-mail: gjwang2018@gmail.com
Mr. Clinton Stevens
Mr. Phillip Badenhorst
Mr. Jaymie Van der Merwe
MSc Student
Interest: theoretical cosmology
e-mail: 20698712@sun.ac.za
Ms Victoria Nakafingo
MSc Student
Interests: 21-cm Cosmology, Large-Scale Structure
e-mail: eggscellent4@yahoo.com
Mr. John Powell
Research
Research Interests:
- Cosmology in Radio wavelength: Epoch of Reionization, 21-cm intensity mapping
- Extragalactic Astronomy: galaxy peculiar velocity field, thermal and kinetic Sunyaev-Zel’dovich effect, dynamics of local group, near-field cosmology
- Theoretical Cosmology: the cosmic microwave background radiation, observational tests of inflation, gravity theories
Current Collaboration Projects:
- Hydrogen Epoch Reionization Array (HERA): Calibration and power spectra analysis
- Square Kilometer Array (SKA) team: EoR, HI, Cosmology Science working groups
- Rubin Observatory (LSST) science team
- CMB Stage-4 Survey
Collaborators:
- Prof Rene Breton, The University of Manchester
- Prof Xuelei Chen, National Astronomical Observatory, China
- Prof Clive Dickinson, The University of Manchester
- Prof Yu Gao, Institute of High Energy Physics
- Prof Hongjian He, Shanghai JiaoTong University
- Prof Di Li, National Astronomical Observatory, China
- Prof Douglas Scott, University of British Columbia
- Prof Aaron Parsons, University of California at Berkeley
- Prof Denis Tramonte, Xian-JiaoTong Liverpool University
- Prof Ludovic Van Waerbeke, University of British Columbia
- Prof Amanda Weltman, University of Cape Town
- Prof Qiang Yuan, Purple Mountain Observatory
Media
Searching for Axion Dark Matter —NITheCS Seminar.
Publication
2024:
12. Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning. Lindsay M. Berkhout et al. (including Yin-Zhe Ma), 2024, Publications of the Astronomical Society of the Pacific, 136, 045002, arXiv: 2401.04304 https://doi.org/10.1088/1538-3873/ad3122
11. Constraining primordial non-Gaussianity using Neural Networks. Chandan G. Nagarajappa, & Yin-Zhe Ma, 2024, Monthly Notices of the Royal Astronomical Society, 529, 3289-3300, arXiv: 2403.02115 https://doi.org/10.1093/mnras/stae679
10. Cross-correlation of cosmic voids with thermal Sunyaev-Zel’dovich data. Gang Li, Yin-Zhe Ma, Denis Tramonte, Guo-Liang Li, 2024, Monthly Notices of the Royal Astronomical Society, 27, 2663-2671, arXiv: 2311.00826 https://doi.org/10.1093/mnras/stad3396
9. Cross-correlation between the thermal Sunyaev-Zeldovich effect and the Integrated Sachs-Wolfe effect. Ayodeji Ibitoye, Wei-Ming Dai, Yin-Zhe Ma, Patricio Vielva, Denis Tramonte, Amare Abebe, Aroonkumar Beesham, Xuelei Chen, 2024, The Astrophysical Journal Supplement Series (ApJS), 270, 16, arXiv: 2310.18478 https://doi.org/10.3847/1538-4365/ad08c5
8. The Dispersion Measure Contributions of the Cosmic Web. Charles R. H. Walker, Laura G. Spitler, Yin-Zhe Ma, Cheng Cheng, M. Celeste Artale, Cameron Hummels, 2024, Astronomy and Astrophysics, 683, A71, arXiv: 2309.08268 https://doi.org/10.1051/0004-6361/202347139
7. HI content of selected mid-infrared bright, starburst blue compact dwarf galaxies. Yogesh Chandola, Di Li, Chao-Wei Tsai, Guodong Li, Yingjie Peng, Pei Zuo, Travis McIntyre, Yin-Zhe Ma, Daniel Stern, Roger Griffith, Thomas Jarrett, Peter Eisenhardt, Chantal Balkowski, 2024, Monthly Notices of the Royal Astronomical Society, 527, 603-619, arXiv: 2310.02202 https://doi.org/10.1093/mnras/stad3018
2023:
6. Solar gamma ray probe of local cosmic ray electrons. Hong-Gang Yang, Yu Gao, Yin-Zhe Ma, Roland M. Crocker, 2023, Physical Review D (Letter) 108, L061304 https://journals.aps.org/prd/pdf/10.1103/PhysRevD.108.L061304
5. Implications for primordial black holes from cosmological constraints on scalar-induced gravitational wave. Junsong Cang, Yin-Zhe Ma, Yu Gao, 2023, The Astrophysical Journal, 949, 64 (6 pages), arXiv: 2210.03476 https://iopscience.iop.org/article/10.3847/1538-4357/acc949/pdf
4. Constraints on dark matter annihilation from the FAST observation of the Coma Berenices dwarf galaxy. Wen-Qing Guo, Yichao Li, Xiaoyuan Huang, Yin-Zhe Ma, Geoff Beck, Yogesh Chandola, Feng Huang, 2023, Physical Review D, 107, 103011, arXiv: 2209.15590 https://journals.aps.org/prd/pdf/10.1103/PhysRevD.107.103011
3. GMRT HI mapping of mid-infrared bright Blue Compact Dwarf Galaxies W1016+3754 & W2326+0608. Yogesh Chandola, Chao-Wei Tsai, Di Li, Chandreyee Sengupta, Yin-Zhe Ma, Pei Zuo, 2023, Monthly Notices of the Royal Astronomical Society, 523, 3848-3862 https://doi.org/10.1093/mnras/stad1618
2. CoLFI: Cosmological Likelihood-free Inference with Neural Density Estimators. Guo-Jian Wang, Cheng Cheng, Yin-Zhe Ma, Jun-Qing Xia, Amare Abebe, and Aroonkumar Beesham, 2023, The Astrophysical Journal Supplement Series, 268, 7 https://doi.org/10.3847/1538-4365/ace113
1. Cross-Correlation Forecast of CSST Spectroscopic Galaxy and MeerKAT Neutral Hydrogen Intensity Mapping Surveys. Yu’er Jiang, Yan Gong, Meng Zhang, Qi Xiong, Xingchen Zhou, Furen Deng, Xuelei Chen, Yin-Zhe Ma, and Bin Yue, 2023, Research in Astronomy and Astrophysics, 23, 075003 (12 pages) https://iopscience.iop.org/article/10.1088/1674-4527/accdc0/pdf