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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

Abundant Population of Broad H$\alpha$ Emitters in the GOODS-N Field Revealed by CONGRESS, FRESCO, and JADES

(2025)

Authors:

Junyu Zhang, Eiichi Egami, Fengwu Sun, Xiaojing Lin, Jianwei Lyu, Yongda Zhu, Pierluigi Rinaldi, Yang Sun, Andrew J Bunker, Rachana Bhatawdekar, Jakob M Helton, Roberto Maiolino, Zheng Ma, Brant Robertson, Sandro Tacchella, Giacomo Venturi, Christina C Williams, Chris Willott

The Large-scale Environments of Low-luminosity AGNs at $3.9 < z < 6$ and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey

(2025)

Authors:

Xiaojing Lin, Xiaohui Fan, Fengwu Sun, Junyu Zhang, Eiichi Egami, Jakob M Helton, Feige Wang, Haowen Zhang, Andrew J Bunker, Zheng Cai, Zhiyuan Ji, Xiangyu Jin, Roberto Maiolino, Maria Anne Pudoka, Pierluigi Rinaldi, Brant Robertson, Sandro Tacchella, Wei Leong Tee, Yang Sun, Christopher NA Willmer, Chris Willott, Yongda Zhu

JADES: Differing assembly histories of galaxies

Astronomy & Astrophysics EDP Sciences 697 (2025) a88

Authors:

Tobias J Looser, Francesco D’Eugenio, Roberto Maiolino, Sandro Tacchella, Mirko Curti, Santiago Arribas, William M Baker, Stefi Baum, Nina Bonaventura, Kristan Boyett, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, A Lola Danhaive, Daniel J Eisenstein, Anna de Graaff, Kevin Hainline, Zhiyuan Ji, Benjamin D Johnson, Nimisha Kumari, Erica Nelson, Eleonora Parlanti, Hans-Walter Rix, Brant Robertson, Bruno Rodríguez Del Pino, Lester Sandles, Jan Scholtz, Renske Smit, Daniel P Stark, Hannah Übler, Christina C Williams, Chris Willott, Joris Witstok
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JADES: The star formation and chemical enrichment history of a luminous galaxy at z ∼ 9.43 probed by ultra-deep JWST/NIRSpec spectroscopy

Astronomy & Astrophysics EDP Sciences 697 (2025) a89

Authors:

Mirko Curti, Joris Witstok, Peter Jakobsen, Chiaki Kobayashi, Emma Curtis-Lake, Kevin Hainline, Xihan Ji, Francesco D’Eugenio, Jacopo Chevallard, Roberto Maiolino, Jan Scholtz, Stefano Carniani, Santiago Arribas, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Andrew J Bunker, Alex Cameron, Phillip A Cargile, Stéphane Charlot, Daniel J Eisenstein, Zhiyuan Ji, Benjamin D Johnson, Nimisha Kumari, Michael V Maseda, Brant Robertson, Maddie S Silcock, Sandro Tacchella, Hannah Übler, Giacomo Venturi, Christina C Williams, Christopher NA Willmer, Chris Willott
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The JWST/PASSAGE Survey: Testing Reionization Histories with JWST’s First Unbiased Survey for Ly α Emitters at Redshifts 7.5–9.5

The Astrophysical Journal American Astronomical Society 984:1 (2025) 95

Authors:

Axel Runnholm, Matthew J Hayes, Vihang Mehta, Matthew A Malkan, Claudia Scarlata, Kalina V Nedkova, Marc Rafelski, Benedetta Vulcani, Mason Huberty, E Christian Herenz, Anne Hutter, Sean Bruton, Ayan Acharyya, Hakim Atek, Ivano Baronchelli, Andrew J Battisti, Maruša Bradač, Andrew J Bunker, Y Sophia Dai, Clea Hannahs, Farhanul Hasan, Keunho J Kim, Nicha Leethochawalit, Yu-Heng Lin

Abstract:

Lyα emission is one of a few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To accomplish this, we need an efficient way to survey for Lyα emitters (LAEs) at redshifts beyond 7, requiring unbiased emission-line observations that are both sufficiently deep and wide to cover enough volume to detect them. Here we present results from PASSAGE—a pure-parallel JWST/NIRISS slitless spectroscopic survey to detect LAEs deep into the EoR, without the bias of photometric preselection. We identify four LAEs at 7.5 ≤ z ≤ 9.5 in four surveyed pointings and estimate the luminosity function (LF). We find that the LF does show a marked decrease compared to post-reionization measurements, but the change is a factor of ≲10, which is less than expected from theoretical calculations and simulations, as well as observational expectations from the pre-JWST literature. Modeling of the intergalactic medium and expected Lyα profiles implies that these galaxies reside in ionized bubbles of ⪆2 physical Mpc. We also report that in the four fields we detect {3, 1, 0, 0} LAEs, which could indicate strong field-to-field variation in the LAE distribution, consistent with a patchy H i distribution at z ∼ 8. We compare the recovered LAE number counts with expectations from simulations and discuss the potential implications for reionization and its morphology.
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