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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

JADES: The production and escape of ionizing photons from faint Lyman-alpha emitters in the epoch of reionization

Astronomy & Astrophysics EDP Sciences 684 (2024) a84

Authors:

Aayush Saxena, Andrew J Bunker, Gareth C Jones, Daniel P Stark, Alex J Cameron, Joris Witstok, Santiago Arribas, William M Baker, Stefi Baum, Rachana Bhatawdekar, Rebecca Bowler, Kristan Boyett, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Mirko Curti, Emma Curtis-Lake, Daniel J Eisenstein, Ryan Endsley, Kevin Hainline, Jakob M Helton, Benjamin D Johnson, Nimisha Kumari, Tobias J Looser, Roberto Maiolino, Marcia Rieke, Hans-Walter Rix, Brant E Robertson, Lester Sandles, Charlotte Simmonds, Renske Smit, Sandro Tacchella, Christina C Williams, Christopher NA Willmer, Chris Willott
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JADES: the emergence and evolution of Lyα emission and constraints on the intergalactic medium neutral fraction

Astronomy & Astrophysics EDP Sciences 683 (2024) A238

Authors:

Gareth C Jones, Andrew J Bunker, Aayush Saxena, Joris Witstok, Daniel P Stark, Santiago Arribas, William M Baker, Rachana Bhatawdekar, Rebecca Bowler, Kristan Boyett, Alex J Cameron, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Mirko Curti, Emma Curtis-Lake, Daniel J Eisenstein, Kevin Hainline, Ryan Hausen, Zhiyuan Ji, Benjamin D Johnson, Nimisha Kumari, Tobias J Looser, Roberto Maiolino, Michael V Maseda, Eleonora Parlanti, Hans-Walter Rix, Brant E Robertson, Lester Sandles, Jan Scholtz, Renske Smit, Sandro Tacchella, Hannah Übler, Christina C Williams, Chris Willott

Abstract:

The rest-frame UV recombination emission line Lyα can be powered by ionising photons from young massive stars in star-forming galaxies, but the fact that it can be resonantly scattered by neutral gas complicates its interpretation. For reionisation-era galaxies, a neutral intergalactic medium will scatter Lyα from the line of sight, making Lyα a useful probe of the neutral fraction evolution. Here, we explore Lyα in JWST/NIRSpec spectra from the ongoing JADES programme, which targets hundreds of galaxies in the well-studied GOODS-S and GOODS-N fields. These sources are UV-faint (−20.4 < MUV < −16.4) and thus represent a poorly explored class of galaxy. We fitted the low spectral resolution spectra (R ∼ 100) of a subset of 84 galaxies in GOODS-S with zspec > 5.6 (as derived with optical lines) with line and continuum models to search for significant line emission. Through exploration of the R100 data, we find evidence for Lyα in 17 sources. This sample allowed us to place observational constraints on the fraction of galaxies with Lyα emission in the redshift range 5.6 < z < 7.5, with a decrease from z = 6 to z = 7. We also find a positive correlation between the Lyα equivalent width and MUV, as seen in other samples. We used these results to estimate the neutral gas fraction at z ∼ 7, and our estimates are in agreement with previous results (XHI ∼ 0.5 − 0.9).
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The UV continuum slopes of early star-forming galaxies in JADES

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:4 (2024) 4087-4103

Authors:

Michael W Topping, Daniel P Stark, Ryan Endsley, Lily Whitler, Kevin Hainline, Benjamin D Johnson, Brant Robertson, Sandro Tacchella, Zuyi Chen, Stacey Alberts, William M Baker, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, Christa DeCoursey, Eiichi Egami, Daniel J Eisenstein, Zhiyuan Ji, Roberto Maiolino, Christina C Williams, Christopher NA Willmer, Chris Willott, Joris Witstok
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No evidence of AGN features in the nuclei of Arp 220 from JWST/NIRSpec IFS

(2024)

Authors:

Michele Perna, Santiago Arribas, Isabella Lamperti, Miguel Pereira-Santaella, Lorenzo Ulivi, Torsten Böker, Roberto Maiolino, Andrew J Bunker, Stéphane Charlot, Giovanni Cresci, Bruno Rodríguez Del Pino, Francesco D'Eugenio, Hannah Übler, Katja Fahrion, Matteo Ceci
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MOSEL survey: Spatially offset Lyman-continuum emission in a new emitter at z=3.088

(2024)

Authors:

Anshu Gupta, Cathryn M Trott, Ravi Jaiswar, EV Ryan-Weber, Andrew J Bunker, Ayan Acharyya, Alex J Cameron, Ben Forrest, Glenn G Kacprzak, Themiya Nanayakkara, Kim-Vy Tran, Aman Chokshi
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