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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

The First Photometric Evidence of a Transient/Variable Source at z > 5 with JWST

The Astrophysical Journal American Astronomical Society 990:1 (2025) 31

Authors:

Christa DeCoursey, Eiichi Egami, Fengwu Sun, Arshia Akhtarkavan, Rachana Bhatawdekar, Andrew J Bunker, David A Coulter, Michael Engesser, Ori D Fox, Sebastian Gomez, Kohei Inayoshi, Benjamin D Johnson, Mitchell Karmen, Conor Larison, Xiaojing Lin, Jianwei Lyu, Seppo Mattila, Takashi J Moriya, Justin DR Pierel, Dávid Puskás, Armin Rest, George H Rieke, Brant Robertson, Sepehr Salamat

Abstract:

The James Webb Space Telescope (JWST) discovered 79 transients out to z ∼ 4.8 through the JADES Transient Survey (JTS), but the JTS did not find any z > 5 transients. We present the first photometric evidence of a z > 5 transient/variable source with JWST. The source, AT 2023adya, resides in a zspec = 5.274 galaxy in GOODS-N, which dimmed from mF356W = 26.05 ± 0.02 mag to 26.24 ± 0.02 mag in the rest-frame optical over approximately 2 rest-frame months, producing a clear residual signal in the difference image (mF356W = 28.01 ± 0.17 mag; SNvar = 6.09) at the galaxy center. Shorter-wavelength bands (F090W/F115W) show no rest-frame UV brightness change. Based on its rest-frame V-band absolute magnitude (MV = −18.48 mag), AT 2023adya could be any core-collapse supernova (SN) subtype or an SN Ia. However, due to low SN Ia rates at high redshift, the SN Ia scenario is unlikely. Alternatively, AT 2023adya may be a variable active galactic nucleus (AGN). The NIRCam/Grism spectrum shows no broad Hα emission line (FWHM = 130 ± 26 km s−1), but we cannot exclude the existence of a faint broad line and therefore cannot exclude the AGN scenario. AT 2023adya is unlikely to be a tidal disruption event (TDE) because the TDE models matching the observed brightness changes have low event rates. Although it is not possible to determine AT 2023adya’s nature based on the two-epoch single-band photometry alone, this discovery pushes the transient/variable science frontier past z = 5 and toward the Epoch of Reionization.
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GA-NIFS and EIGER: A merging quasar host at z=7 with an overmassive black hole

Astronomy & Astrophysics EDP Sciences (2025)

Authors:

Madeline A Marshall, Minghao Yue, Anna-Christina Eilers, Jan Scholtz, Michele Perna, Chris J Willott, Roberto Maiolino, Hannah Übler, Santiago Arribas, Andrew J Bunker, Stephane Charlot, Bruno Rodríguez Del Pino, Torsten Böker, Stefano Carniani, Chiara Circosta, Giovanni Cresci, Francesco D’Eugenio, Gareth C Jones, Giacomo Venturi, Rongmon Bordoloi, Daichi Kashino, Ruari Mackenzie, Jorryt Matthee, Rohan Naidu, Robert A Simcoe

Abstract:

The James Webb Space Telescope is revolutionising our ability to understand the host galaxies and local environments of high-z quasars. Here we obtain a comprehensive understanding of the host galaxy of the z=7.08 quasar by combining NIRSpec integral field spectroscopy with NIRCam photometry of the host continuum emission. Our emission-line maps reveal that this quasar host is undergoing a merger with a bright companion galaxy. The quasar host and the companion have similar dynamical masses of ∼10^ M_⊙, suggesting that this is a major galaxy interaction. Through detailed quasar subtraction and SED fitting using the NIRCam data, we obtained an estimate of the host stellar mass of M_*=(3.0^ with M_ for the companion galaxy. Using the Balmer line, we estimated a virial black hole mass of M_ BH M_⊙. Thus has an extreme black hole--stellar mass ratio of M_ BH /M_*=0.63^ which is ∼3 dex larger than expected by the local scaling relations between black hole and stellar mass. is powered by an overmassive black hole with the highest reported black hole--stellar mass ratio in a quasar host that is currently undergoing a major merger. These new insights highlight the power of JWST for measuring and understanding these extreme first quasars.
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The Importance of Dust Distribution in Ionizing-photon Escape: NIRCam and MIRI Imaging of a Lyman Continuum-emitting Galaxy at z ∼ 3.8

The Astrophysical Journal Letters American Astronomical Society 988:2 (2025) L69

Authors:

Zhiyuan Ji, Stacey Alberts, Yongda Zhu, Eros Vanzella, Mauro Giavalisco, Kevin Hainline, William M Baker, Andrew J Bunker, Jakob M Helton, Jianwei Lyu, Pierluigi Rinaldi, Brant Robertson, Charlotte Simmonds, Sandro Tacchella, Christina C Williams, Christopher NA Willmer, Joris Witstok

Abstract:

We present deep JWST/NIRCam and MIRI imaging of Ion1, a previously confirmed Lyman continuum (LyC)-emitting galaxy at zspec = 3.794. Together with existing Hubble Space Telescope imaging, these new observations from the JWST Advanced Deep Extragalactic Survey program enable a joint analysis of Ion1’s LyC, rest-frame UV, stellar, and dust emission with unprecedented detail. We report the first detection of dust emission at rest-frame ∼3 μm in a high-redshift LyC-emitting galaxy using MIRI/F1500W. Our analysis suggests a porous distribution of dust in Ion1, with regions exhibiting evidence of dust deficit coinciding both with LyC-emitting regions and with the peak of Hα emission. Furthermore, multiband NIRCam imaging reveals a strong far-UV-to-optical color gradient, where LyC-emitting regions appear significantly bluer than the rest of Ion1. Spatially resolved spectral energy distribution fitting confirms that this color gradient is primarily driven by spatially varying dust attenuation. Together, these findings suggest that Ion1’s LyC emission originates from a compact star-forming complex near its stellar-light centroid, where stellar feedback carves out low-H i-column-density channels, facilitating LyC escape. However, only a fraction of these LyC photons—specifically those along sightlines with minimal H i obscuration—ultimately escape and reach observers. This work underscores the critical role of dust and neutral gas geometry in shaping LyC escape in galaxies at high redshifts. Anisotropic LyC escape may be a common feature in the early Universe, which must be properly incorporated to constrain the epoch of reionization.
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Detection of the 2175 Å UV bump at z > 7: evidence for rapid dust evolution in a merging reionization-era galaxy

Monthly Notices of the Royal Astronomical Society Oxford University Press 542:2 (2025) 1136-1154

Authors:

Katherine Ormerod, Joris Witstok, Renske Smit, Anna de Graaff, Jakob M Helton, Michael V Maseda, Irene Shivaei, Andrew J Bunker, Stefano Carniani, Francesco D’Eugenio, Rachana Bhatawdekar, Jacopo Chevallard, Marijn Franx, Nimisha Kumari, Roberto Maiolino, Pierluigi Rinaldi, Brant Robertson, Sandro Tacchella

Abstract:

Dust is a fundamental component of the interstellar medium within galaxies, as dust grains are highly efficient absorbers of ultraviolet (UV) and optical photons. Accurately quantifying this obscuration is crucial for interpreting galaxy spectral energy distributions (SEDs). The extinction curves in the Milky Way (MW) and Large Magellanic Cloud exhibit a strong feature known as the 2175 Å UV bump, most often attributed to small carbonaceous dust grains. This feature was recently detected in faint galaxies out to , suggesting rapid formation channels. Here, we report the detection of a strong UV bump in a luminous Lyman-break galaxy at , GNWY-7379420231, through observations taken as part of the NIRSpec Wide GTO survey. We fit a dust attenuation curve that is consistent with the MW extinction curve within , in a galaxy just Myr after the big bang. From the integrated spectrum, we infer a young mass-weighted age ( Myr) for this galaxy, however spatially resolved SED fitting unveils the presence of an older stellar population ( Myr). Furthermore, morphological analysis provides evidence for a potential merger. The underlying older stellar population suggests the merging system could be pre-enriched, with the dust illuminated by a merger-induced starburst. Moreover, turbulence driven by stellar feedback in this bursty region may be driving polycyclic aromatic hydrocarbon formation through top-down shattering. The presence of a UV bump in GNWY-7379420231 solidifies growing evidence for the rapid evolution of dust properties within the first billion years of cosmic time.
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Accelerated quenching and chemical enhancement of massive galaxies in a z ≈ 4 gas-rich halo

Nature Astronomy Springer Nature 9:8 (2025) 1240-1255

Authors:

Pablo G Pérez-González, Francesco D’Eugenio, Bruno Rodríguez del Pino, Michele Perna, Hannah Übler, Roberto Maiolino, Santiago Arribas, Giovanni Cresci, Isabella Lamperti, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Chris J Willott, Torsten Böker, Eleonora Parlanti, Jan Scholtz, Giacomo Venturi, Guillermo Barro, Luca Costantin, Ignacio Martín-Navarro, James S Dunlop, Daniel Magee

Abstract:

Stars in galaxies form when baryons radiatively cool down and fall into gravitational wells whose mass is dominated by dark matter. Eventually, star formation quenches as gas is depleted and/or perturbed by feedback processes, no longer being able to collapse and condense. We report the first spatially resolved spectroscopic observations, using the JWST/NIRSpec IFU, of a massive, completely quiescent galaxy (Jekyll) and its neighborhood at z = 3.714, when the Universe age was 10% of today’s. Jekyll resides in a massive dark matter halo (with mass MDM > 1012 M→) and forms a galaxy pair with Hyde, which shows very intense dust-enshrouded star formation (star formation rate → 300 M→ yr↑1). We find large amounts of kinematically perturbed ionized and neutral gas in the circumgalactic medium around the pair. Despite this large gas reservoir, Jekyll, which formed 1011 M→ in stars and chemically enriched early (first billion years of the Universe) and quickly (200–300 Myr), has remained quiescent for over 500 Myr. The properties of the gas found around the two galaxies are consistent with intense, AGN-induced photoionization, or intense shocks. However, with the current data no obscured or unobscured AGN is detected in the central galaxy (Jekyll) nor in the very active and dust rich star-forming galaxy (Hyde).

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