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Peer-reviewedCC BY 4.0Mon.Not.Roy.Astron.Soc.

The BUFFALO Survey : The Subhalo Mass Function for Abell 2744 with Strong+Weak Gravitational Lensing

  • Nency R Patel
  • Mathilde Jauzac
  • Anna Niemiec
  • Guillaume Mahler
  • David Lagattuta
  • David Harvey
  • Johannes Schwinn
  • Andrew Robertson
  • Lukas J Furtak
  • Sownak Bose
  • Alastair Edge
  • Anton Koekemoer
7 more authors
  • Jose Diego
  • Andreas Faisst
  • Eric Jullo
  • Marceau Limousin
  • Richard Massey
  • Derek Perera
  • Sut-Ieng Tam
Open at sourcePDFDOICite

Abstract

We present a combined strong and weak gravitational lensing mass model of the massive merging galaxy cluster Abell 2744 (z = 0.308). The mass reconstruction combines strong-lensing constraints in the cluster core with weak-lensing measurements derived from deep imaging with the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST), enabling a reconstruction of the projected mass distribution from the core to the cluster outskirts. Using the resulting mass map, we identify cluster substructures and construct the subhalo mass function (SHMF) for Abell 2744. To interpret the observed substructure population, we apply identical detection methods to projected mass maps of massive galaxy clusters from the BAryons and HAloes of MAssive Systems (BAHAMAS) simulations. We observe a systematic excess of detected substructures in Abell 2744 compared to BAHAMAS. We interpret this excess as likely reflecting Abell 2744's exceptionally disturbed dynamical state, characterised by complex ongoing mergers, rather than tension with ΛCold Dark Matter (ΛCDM) or self-interacting dark matter (SIDM) predictions. Although confirming this interpretation will require extending the analysis to a larger sample of clusters spanning a range of dynamical states.

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Cite

BibTeXRIS
BibTeX
@article{patel2026buffalo,
  title = {{The BUFFALO Survey : The Subhalo Mass Function for Abell 2744 with Strong+Weak Gravitational Lensing}},
  author = {Nency R Patel and Mathilde Jauzac and Anna Niemiec and Guillaume Mahler and David Lagattuta and David Harvey and Johannes Schwinn and Andrew Robertson and Lukas J Furtak and Sownak Bose and Alastair Edge and Anton Koekemoer and Jose Diego and Andreas Faisst and Eric Jullo and Marceau Limousin and Richard Massey and Derek Perera and Sut-Ieng Tam},
  journal = {Mon.Not.Roy.Astron.Soc.},
  year = {2026},
  month = oct,
  doi = {10.1093/mnras/stag1849},
  eprint = {2610.08919},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05786405v1},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - The BUFFALO Survey : The Subhalo Mass Function for Abell 2744 with Strong+Weak Gravitational Lensing
AU  - Nency R Patel
AU  - Mathilde Jauzac
AU  - Anna Niemiec
AU  - Guillaume Mahler
AU  - David Lagattuta
AU  - David Harvey
AU  - Johannes Schwinn
AU  - Andrew Robertson
AU  - Lukas J Furtak
AU  - Sownak Bose
AU  - Alastair Edge
AU  - Anton Koekemoer
AU  - Jose Diego
AU  - Andreas Faisst
AU  - Eric Jullo
AU  - Marceau Limousin
AU  - Richard Massey
AU  - Derek Perera
AU  - Sut-Ieng Tam
PY  - 2026
DA  - 2026/10/06
JO  - Mon.Not.Roy.Astron.Soc.
DO  - 10.1093/mnras/stag1849
UR  - https://hal.science/hal-05786405v1
AB  - We present a combined strong and weak gravitational lensing mass model of the massive merging galaxy cluster Abell 2744 (z = 0.308). The mass reconstruction combines strong-lensing constraints in the cluster core with weak-lensing measurements derived from deep imaging with the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST), enabling a reconstruction of the projected mass distribution from the core to the cluster outskirts. Using the resulting mass map, we identify cluster substructures and construct the subhalo mass function (SHMF) for Abell 2744. To interpret the observed substructure population, we apply identical detection methods to projected mass maps of massive galaxy clusters from the BAryons and HAloes of MAssive Systems (BAHAMAS) simulations. We observe a systematic excess of detected substructures in Abell 2744 compared to BAHAMAS. We interpret this excess as likely reflecting Abell 2744's exceptionally disturbed dynamical state, characterised by complex ongoing mergers, rather than tension with ΛCold Dark Matter (ΛCDM) or self-interacting dark matter (SIDM) predictions. Although confirming this interpretation will require extending the analysis to a larger sample of clusters spanning a range of dynamical states.
ER  -