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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Guangwen Chen

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
  • The Square Kilometre Array (SKA)
guangwen.chen@physics.ox.ac.uk
Telephone: 07593832127
Denys Wilkinson Building, room Dalitz 3
ORCID
  • About
  • Publications

A negative stellar mass−gaseous metallicity gradient relation of dwarf galaxies modulated by stellar feedback

Astronomy & Astrophysics EDP Sciences 698 (2025) a208

Authors:

Tie Li, Hong-Xin Zhang, Wenhe Lyu, Yimeng Tang, Yao Yao, Enci Wang, Yu Rong, Guangwen Chen, Xu Kong, Fuyan Bian, Qiusheng Gu, Evelyn J Johnston, Xin Li, Shude Mao, Yong Shi, Junfeng Wang, Xin Wang, Xiaoling Yu, Zhiyuan Zheng

Abstract:

Baryonic cycling is reflected in the spatial distribution of metallicity within galaxies; however, gas-phase metallicity distribution and its connection with other properties of dwarf galaxies are largely unexplored. We present the first systematic study of radial gradients of gas-phase metallicities for a sample of 55 normal nearby star-forming dwarf galaxies (stellar mass M ⋆ ranging from 10 7 to 10 9.5 M ⊙ ) based on MUSE wide-field spectroscopic observations. We find that the metallicity gradient has a significant negative correlation (Spearman’s rank correlation coefficient r ≃ −0.56) with M ⋆ , which is in contrast with the flat or even positive correlation observed for higher-mass galaxies. The negative correlation is accompanied by a stronger central suppression of metallicity compared to the outskirts in lower-mass galaxies. Among the other explored galaxy properties, including baryonic mass, star formation distribution, galaxy environment, regularity of gaseous velocity field, and effective yield of metals y eff , only the regularity of gaseous velocity field and y eff have residual correlation with metallicity gradient after controlling for M ⋆ , in the sense that galaxies with an irregular velocity field or lower y eff favor a less negative or more positive metallicity gradient. Particularly, a linear combination of logarithmic stellar mass and y eff significantly improves the correlation with metallicity gradients ( r ∼ −0.68) compared to using stellar mass alone. The lack of correlation with environment disproves gas accretion as a relevant factor shaping the metallicity distribution. The correlation with both gaseous velocity field regularity and y eff implies the importance of stellar feedback-driven metal redistribution within the ISM. Our finding suggests that the metal mixing and transport process, including but not limited to feedback-driven outflow, are more important than in situ metal production in shaping the metallicity distribution of dwarf galaxies.
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Dependence of Metal Enrichment of Nuclear Star Clusters on Galaxy Stellar Mass

The Astrophysical Journal American Astronomical Society 979:1 (2025) 85

Authors:

Wenhe Lyu, Hong-Xin Zhang, Sanjaya Paudel, Tie Li, Yimeng Tang, Guangwen Chen, Xu Kong, Eric W Peng
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Radio-to-submillimetre spectral energy distributions of NGC 1365

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 530:1 (2024) 819-835

Authors:

Guangwen Chen, George J Bendo, Gary A Fuller, Hong-Xin Zhang, Xu Kong
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Physical Properties of Hyperluminous, Dust-obscured Quasars at z ∼ 3: Multiwavelength Spectral Energy Distribution Analysis and Cold Gas Content Revealed by ALMA

The Astrophysical Journal American Astronomical Society 964:1 (2024) 95

Authors:

Weibin Sun, Lulu Fan, Yunkun Han, Kirsten K Knudsen, Guangwen Chen, Hong-Xin Zhang
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Dwarf Galaxies with the Highest Concentration Are Not Thicker than Ordinary Dwarf Galaxies

The Astrophysical Journal American Astronomical Society 958:2 (2023) 117

Authors:

Lijun Chen, Hong-Xin Zhang, Zesen Lin, Guangwen Chen, Bojun Tao, Zhixiong Liang, Zheyu Lin, Xu Kong
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