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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

No evidence of active galactic nucleus features in the nuclei of Arp 220 from JWST/NIRSpec IFS

Astronomy & Astrophysics EDP Sciences 690 (2024) a171

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 Can Explain the Low Number Density of Observed LyC Leakers

The Astrophysical Journal American Astronomical Society 973:2 (2024) 169

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

Abstract:

We present the discovery of a unique Lyman-continuum (LyC) emitter at z = 3.088. The LyC emission was detected using the Hubble Space Telescope WFC3/UVIS F336W filter, covering a rest-frame wavelength range of 760–900 Å. The peak signal-to-noise ratio of LyC emission is 3.9 in an r = 0.″24 aperture and is spatially offset by 0.″29 ± 0.″04 (∼2.2 ± 0.3 kpc) from the peak of rest-UV emission (F606W). By combining imaging and spectroscopic data from the James Webb Space Telescope (JWST) JADES, FRESCO, and JEMS surveys, along with VLT/MUSE data from the MXDF survey, we estimate that the probability of random alignment with an interloper galaxy causing the LyC emission is less than 6 × 10−5. The interstellar medium (ISM) conditions in the galaxy are similar to those in other LyC emitters at high redshift ( 12+log(O/H)=7.79−0.05+0.06 , logU=−3.27−0.12+0.14 , O32 = 0.63 ± 0.03), although the single-peaked Lyα profile and lack of rest-UV emission lines suggest an optically thick ISM. Our observations indicate that LyC photons are leaking through a narrow cone of optically thin neutral ISM, most likely created by a past merger (as evidenced by medium-band F210M and F182M images). Using the constraints on escape fraction from individual leakers and a simple model, we estimate that the opening half-angle of ionization cones can be as small as 16° (2% ionized fraction) to reproduce some of the theoretical constraints on the average escape fraction for galaxies. The narrow opening angle required can explain the low number density of confirmed LyC leakers.
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The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction?

(2024)

Authors:

Stefano Carniani, Francesco D'Eugenio, Xihan Ji, Eleonora Parlanti, Jan Scholtz, Fengwu Sun, Giacomo Venturi, Tom JLC Bakx, Mirko Curti, Roberto Maiolino, Sandro Tacchella, Jorge A Zavala, Kevin Hainline, Joris Witstok, Benjamin D Johnson, Stacey Alberts, Andrew J Bunker, Stéphane Charlot, Daniel J Eisenstein, Jakob M Helton, Peter Jakobsen, Nimisha Kumari, Brant Robertson, Aayush Saxena, Hannah Übler, Christina C Williams, Christopher NA Willmer, Chris Willott
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Extended hot dust emission around the earliest massive quiescent galaxy

(2024)

Authors:

Zhiyuan Ji, Christina C Williams, George H Rieke, Jianwei Lyu, Stacey Alberts, Fengwu Sun, Jakob M Helton, Marcia Rieke, Irene Shivaei, Francesco D'Eugenio, Sandro Tacchella, Brant Robertson, Yongda Zhu, Roberto Maiolino, Andrew J Bunker, Yang Sun, Christopher NA Willmer
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A Systematic Search for Galaxies with Extended Emission Line and Potential Outflows in JADES Medium-Band Images

(2024)

Authors:

Yongda Zhu, Marcia J Rieke, Zhiyuan Ji, Charlotte Simmonds, Fengwu Sun, Yang Sun, Stacey Alberts, Rachana Bhatawdekar, Andrew J Bunker, Phillip A Cargile, Stefano Carniani, Anna de Graaff, Kevin Hainline, Jakob M Helton, Gareth C Jones, Jianwei Lyu, George H Rieke, Pierluigi Rinaldi, Brant Robertson, Jan Scholtz, Hannah Übler, Christina C Williams, Christopher NA Willmer
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