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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

Witnessing the onset of reionisation via Lyman-$\alpha$ emission at redshift 13

(2024)

Authors:

Joris Witstok, Peter Jakobsen, Roberto Maiolino, Jakob M Helton, Benjamin D Johnson, Brant E Robertson, Sandro Tacchella, Alex J Cameron, Renske Smit, Andrew J Bunker, Aayush Saxena, Fengwu Sun, Stacey Alberts, Santiago Arribas, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Phillip A Cargile, Stefano Carniani, Stéphane Charlot, Jacopo Chevallard, Mirko Curti, Emma Curtis-Lake, Francesco D'Eugenio, Daniel J Eisenstein, Kevin N Hainline, Gareth C Jones, Nimisha Kumari, Michael V Maseda, Pablo G Pérez-González, Pierluigi Rinaldi, Jan Scholtz, Hannah Übler, Christina C Williams, Christopher NA Willmer, Chris Willott, Yongda Zhu
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5–25 μ m Galaxy Number Counts from Deep JWST Data

The Astrophysical Journal American Astronomical Society 972:1 (2024) 62

Authors:

Meredith A Stone, Stacey Alberts, George H Rieke, Andrew J Bunker, Jianwei Lyu, Pablo G Pérez-González, Irene Shivaei, Yongda Zhu

Abstract:

Galaxy number counts probe the evolution of galaxies over cosmic time and serve as a valuable comparison point to theoretical models of galaxy formation. We present new galaxy number counts in eight photometric bands between 5 and 25 μm from the Systematic Mid-infrared Instrument Legacy Extragalactic Survey and the JWST Advanced Deep Extragalactic Survey deep MIRI parallel, extending to unprecedented depth. By combining our new MIRI counts with existing data from Spitzer and AKARI, we achieve counts across 3–5 orders of magnitude in flux in all MIRI bands. Our counts diverge from predictions from recent semianalytical models of galaxy formation, likely due to their treatment of mid-IR aromatic features. Finally, we integrate our combined JWST−Spitzer counts at 8 and 24 μm to measure the cosmic infrared background (CIB) light at these wavelengths; our measured CIB fluxes are consistent with those from previous mid-IR surveys but larger than predicted by models based on TeV blazar data.
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Details from ORA

Discovery of a Relativistic Stripped-envelope Type Ic-BL Supernova at z = 2.83 with JWST

The Astrophysical Journal Letters American Astronomical Society 972:1 (2024) L13

Authors:

MR Siebert, C DeCoursey, DA Coulter, M Engesser, JDR Pierel, A Rest, E Egami, M Shahbandeh, W Chen, OD Fox, Y Zenati, TJ Moriya, AJ Bunker, PA Cargile, M Curti, DJ Eisenstein, S Gezari, S Gomez, M Guolo, BD Johnson, BA Joshi, M Karmen, R Maiolino, RM Quimby

Abstract:

We present James Webb Space Telescope (JWST) NIRCam and NIRSpec observations of a Type Ic supernova (SN Ic) and its host galaxy (JADES-GS+53.13533-27.81457) at z = 2.83. This SN (named SN 2023adta) was identified in deep JWST/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Follow-up observations with JWST/NIRSpec provided a spectroscopic redshift of z = 2.83 and the classification as an SN Ic-BL. The light curve of SN 2023adta matches well with other stripped-envelope SNe, and we find a high peak luminosity, M V = −19.0 ± 0.2 mag, based on the distribution of best-fit SNe. The broad absorption features in its spectrum are consistent with other SNe Ic-BL 1–3 weeks after peak brightness. We measure a Ca ii near-IR triplet expansion velocity of 29,000 ± 2000 km s−1. The host galaxy of SN 2023adta is irregular, and modeling of its spectral energy distribution indicates a metallicity of Z=0.35−0.08+0.16Z⊙ . This environment is consistent with the population of low-z SNe Ic-BL that prefer lower metallicities relative to other stripped-envelope SNe and track long-duration γ-ray burst environments. We do not identify any γ-ray bursts that are coincident with SN 2023adta. Given the rarity of SNe Ic-BL in the local Universe, the detection of an SN Ic-BL at z = 2.83 could indicate that their rates are enhanced at high redshift.
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Details from ORA

GA-NIFS: the interplay between merger, star formation, and chemical enrichment in MACS1149-JD1 at z = 9.11 with JWST/NIRSpec

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 533:2 (2024) 2488-2501

Authors:

C Marconcini, F D’Eugenio, R Maiolino, S Arribas, A Bunker, S Carniani, S Charlot, M Perna, B Rodríguez Del Pino, H Übler, CJ Willott, T Böker, G Cresci, M Curti, GC Jones, I Lamperti, E Parlanti, G Venturi
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Discovery of an Apparent Red, High-velocity Type Ia Supernova at z = 2.9 with JWST

The Astrophysical Journal Letters American Astronomical Society 971:2 (2024) L32

Authors:

JDR Pierel, M Engesser, DA Coulter, C DeCoursey, MR Siebert, A Rest, E Egami, W Chen, OD Fox, DO Jones, BA Joshi, TJ Moriya, Y Zenati, AJ Bunker, PA Cargile, M Curti, DJ Eisenstein, S Gezari, S Gomez, M Guolo, BD Johnson, M Karmen, R Maiolino, RM Quimby

Abstract:

We present the James Webb Space Telescope (JWST) discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS+53.13485−27.82088 with a host spectroscopic redshift of 2.903 ± 0.007. The transient was identified in deep (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic follow-up with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (c ∼ 0.9) despite a host galaxy with low extinction and has a high Ca ii velocity (19,000 ± 2000 km s−1) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-z Ca-rich population. Although such an object is too red for any low-z cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement (≲1σ) with ΛCDM. Therefore unlike low-z Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high z truly diverge from their low-z counterparts and to confirm that standardized luminosities nevertheless remain constant with redshift.
More details from the publisher
Details from ORA

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