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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

JWST/NIRSpec WIDE survey: a z=4.6 low-mass star-forming galaxy hosting a jet-driven shock with low ionisation and solar metallicity

(2024)

Authors:

Francesco D'Eugenio, Roberto Maiolino, Vijay H Mahatma, Giovanni Mazzolari, Stefano Carniani, Anna de Graaff, Michael V Maseda, Eleonora Parlanti, Andrew J Bunker, Xihan Ji, Gareth C Jones, Raffaella Morganti, Jan Scholtz, Sandro Tacchella, Clive Tadhunter, Hannah Übler, Giacomo Venturi
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The star-forming and ionizing properties of dwarf z ~ 6–9 galaxies in JADES: insights on bursty star formation and ionized bubble growth

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 533:1 (2024) 1111-1142

Authors:

Ryan Endsley, Daniel P Stark, Lily Whitler, Michael W Topping, Benjamin D Johnson, Brant Robertson, Sandro Tacchella, Stacey Alberts, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Andrew J Bunker, Alex J Cameron, Stefano Carniani, Stephane Charlot, Zuyi Chen, Jacopo Chevallard, Emma Curtis-Lake, A Lola Danhaive, Eiichi Egami, Daniel J Eisenstein, Kevin Hainline, Jakob M Helton, Zhiyuan Ji, Tobias J Looser, Roberto Maiolino, Erica Nelson, Dávid Puskás, George Rieke, Marcia Rieke, Hans-Walter Rix, Lester Sandles, Aayush Saxena, Charlotte Simmonds, Renske Smit, Fengwu Sun, Christina C Williams, Christopher NA Willmer, Chris Willott, Joris Witstok
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JADES Ultra-red Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations

(2024)

Authors:

Justus L Gibson, Erica Nelson, Christina C Williams, Sedona H Price, Katherine E Whitaker, Katherine A Suess, Anna de Graaff, Benjamin D Johnson, Andrew J Bunker, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Stephane Charlot, Emma Curtis-Lake, Daniel J Eisenstein, Kevin Hainline, Ryan Hausen, Roberto Maiolino, George Rieke, Marcia Rieke, Brant Robertson, Sandro Tacchella, Chris Willott
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GA-NIFS: The core of an extremely massive protocluster at the epoch of reionisation probed with JWST/NIRSpec

Astronomy & Astrophysics EDP Sciences 688 (2024) a146

Authors:

Santiago Arribas, Michele Perna, Bruno Rodríguez Del Pino, Isabella Lamperti, Francesco D’Eugenio, Pablo G Pérez-González, Gareth C Jones, Alejandro Crespo Gómez, Mirko Curti, Seunghwan Lim, Javier Álvarez-Márquez, Andrew J Bunker, Stefano Carniani, Stéphane Charlot, Peter Jakobsen, Roberto Maiolino, Hannah Übler, Chris J Willott, Torsten Böker, Jacopo Chevallard, Chiara Circosta, Giovanni Cresci, Nimisha Kumari, Eleonora Parlanti, Jan Scholtz, Giacomo Venturi, Joris Witstok
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Spectroscopic confirmation of two luminous galaxies at a redshift of 14

Nature Nature Research 633:8029 (2024) 318-322

Authors:

Stefano Carniani, Kevin Hainline, Francesco D’Eugenio, Daniel J Eisenstein, Peter Jakobsen, Joris Witstok, Benjamin D Johnson, Jacopo Chevallard, Roberto Maiolino, Jakob M Helton, Chris Willott, Brant Robertson, Stacey Alberts, Santiago Arribas, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Andrew J Bunker, Alex J Cameron, Phillip A Cargile, Stéphane Charlot, Mirko Curti, Emma Curtis-Lake, Eiichi Egami, Gareth C Jones, Aayush Saxena

Abstract:

The first observations of the James Webb Space Telescope (JWST) have revolutionized our understanding of the Universe by identifying galaxies at redshift z ≈ 13 (refs. 1–3). In addition, the discovery of many luminous galaxies at Cosmic Dawn (z > 10) has suggested that galaxies developed rapidly, in apparent tension with many standard models4–8. However, most of these galaxies lack spectroscopic confirmation, so their distances and properties are uncertain. Here we present JWST Advanced Deep Extragalactic Survey–Near-Infrared Spectrograph spectroscopic confirmation of two luminous galaxies at z=14.32−0.20+0.08 and z = 13.90 ± 0.17. The spectra reveal ultraviolet continua with prominent Lyman-α breaks but no detected emission lines. This discovery proves that luminous galaxies were already in place 300 million years after the Big Bang and are more common than what was expected before JWST. The most distant of the two galaxies is unexpectedly luminous and is spatially resolved with a radius of 260 parsecs. Considering also the very steep ultraviolet slope of the second galaxy, we conclude that both are dominated by stellar continuum emission, showing that the excess of luminous galaxies in the early Universe cannot be entirely explained by accretion onto black holes. Galaxy formation models will need to address the existence of such large and luminous galaxies so early in cosmic history.
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