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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.

Andrew Bunker

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
Andy.Bunker@physics.ox.ac.uk
Telephone: 01865 (2)83126
Denys Wilkinson Building, room 702
  • About
  • Publications

GA-NIFS: Witnessing the complex assembly of a star-forming system at z = 5.7

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf899

Authors:

Gareth C Jones, Andrew J Bunker, Kseniia Telikova, Santiago Arribas, Stefano Carniani, Stephane Charlot, Francesco D’Eugenio, Roberto Maiolino, Michele Perna, Bruno Rodríguez Del Pino, Hannah Übler, Chris Willott, Manuel Aravena, Torsten Böker, Giovanni Cresci, Mirko Curti, Jorge González-López, Rodrigo Herrera-Camus, Isabella Lamperti, Eleonora Parlanti, Pablo G Pérez-González, Vicente Villanueva
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SMILES: Potentially Higher Ionizing Photon Production Efficiency in Overdense Regions

The Astrophysical Journal American Astronomical Society 986:1 (2025) 18

Authors:

Yongda Zhu, Stacey Alberts, Jianwei Lyu, Jane Morrison, George H Rieke, Yang Sun, Jakob M Helton, Zhiyuan Ji, Rachana Bhatawdekar, Nina Bonaventura, Andrew J Bunker, Xiaojing Lin, Marcia J Rieke, Pierluigi Rinaldi, Irene Shivaei, Christopher NA Willmer, Junyu Zhang

Abstract:

The topology of reionization and the environments where galaxies efficiently produce ionizing photons are key open questions. For the first time, we investigate the trend between ionizing photon production efficiency, ξion, and galaxy overdensity, log(1+δ) . We analyze the ionizing properties of 79 galaxies between 1.0 < z < 5.2 using JWST NIRSpec medium-resolution spectra from the Systematic Mid-infrared Instrument Legacy Extragalactic Survey (SMILES) program. Among these, 67 galaxies have Hα coverage, spanning 1.0 < z < 3.1. The galaxy overdensity, log(1+δ) , is measured using the JADES photometric catalog, which covers the SMILES footprint. For the subset with Hα coverage, we find that logξion is positively correlated with log(1+δ) , with a slope of 0.94−0.46+0.46 . Additionally, the mean ξion for galaxies in overdense regions ( log(1+δ)>0.1 ) is 2.43 times that of galaxies in lower density regions ( log(1+δ)<0.1 ). This strong trend is found to be independent of redshift evolution. Furthermore, our results confirm the robust correlations between ξion and the rest-frame equivalent widths of the [O iii] or Hα emission lines. Our results suggest that galaxies in high-density regions are efficient producers of ionizing photons.
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JADES: nitrogen enhancement in high-redshift broad-line active galactic nuclei

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 541:1 (2025) l71-l79

Authors:

Yuki Isobe, Roberto Maiolino, Francesco D’Eugenio, Mirko Curti, Xihan Ji, Ignas Juodžbalis, Jan Scholtz, Anne Feltre, Stéphane Charlot, Hannah Übler, Andrew J Bunker, Stefano Carniani, Emma Curtis-Lake, Zhiyuan Ji, Nimisha Kumari, Pierluigi Rinaldi, Brant Robertson, Chris Willott, Joris Witstok
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GA-NIFS: Mapping $z\simeq3.5$ AGN-driven ionized outflows in the COSMOS field

(2025)

Authors:

E Bertola, G Cresci, G Venturi, M Perna, C Circosta, G Tozzi, I Lamperti, C Vignali, S Arribas, AJ Bunker, S Charlot, S Carniani, R Maiolino, B Rodríguez Del Pino, H Übler, CJ Willott, T Böker, MA Marshall, E Parlanti, J Scholtz
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SAPPHIRES: Extremely Metal-Poor Galaxy Candidates with $12+{\rm log(O/H)}<7.0$ at $z\sim5-7$ from Deep JWST/NIRCam Grism Observations

(2025)

Authors:

Tiger Yu-Yang Hsiao, Fengwu Sun, Xiaojing Lin, Dan Coe, Eiichi Egami, Daniel J Eisenstein, Yoshinobu Fudamoto, Andrew J Bunker, Xiaohui Fan, Yuichi Harikane, Jakob M Helton, Koki Kakiichi, Yichen Liu, Weizhe Liu, Roberto Maiolino, Masami Ouchi, Wei Leong Tee, Feige Wang, Yunjing Wu, Yi Xu, Jinyi Yang, Yongda Zhu
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