The signal of decaying dark matter with hydrodynamical simulations

Mark R. Lovell, David Barnes, Yannick Bahé, Joop Schaye, Matthieu Schaller, Tom Theuns, Sownak Bose, Robert A. Crain, Claudio Dalla Vecchia, Carlos S. Frenk, Wojciech Hellwing, Scott T. Kay, Aaron D. Ludlow, Richard G. Bower

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dark matter particles may decay, emitting photons. Drawing on the EAGLE family of hydrodynamical simulations of galaxy formation - including the APOSTLE and C-EAGLE simulations - we assess the systematic uncertainties and scatter on the decay flux from different galaxy classes, from Milky Way satellites to galaxy clusters, and compare our results to studies of the 3.55 keV line. We demonstrate that previous detections and non-detections of this line are consistent with a dark matter interpretation. For example, in our simulations the width of the dark matter decay line for Perseus-analogue galaxy clusters lies in the range of 1300-1700 km s−1 , and exceptionally up to 3000 km s−1 . Therefore, the non-detection of the 3.55 keV line in the centre of the Perseus cluster by the Hitomi collaboration is consistent with detections by other instruments. We also consider trends with stellar and halo mass and evaluate the scatter in the expected fluxes arising from the anisotropic halo mass distribution and from object-to-object variations. We provide specific predictions for observations with XMM-Newton and with the planned X-ray telescopes XRISM and ATHENA. If future detections of unexplained X-ray lines match our predictions, including line widths, we will have strong evidence that we have discovered the dark matter.

Original languageEnglish
Pages (from-to)4071-4089
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number3
DOIs
Publication statusPublished - 28 Feb 2019

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dark matter
galaxies
simulation
halos
decay
galactic evolution
XMM-Newton telescope
prediction
predictions
stellar mass
mass distribution
newton
x rays
telescopes
analogs
trends
photons
detection

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Lovell, M. R., Barnes, D., Bahé, Y., Schaye, J., Schaller, M., Theuns, T., ... Bower, R. G. (2019). The signal of decaying dark matter with hydrodynamical simulations. Monthly Notices of the Royal Astronomical Society, 485(3), 4071-4089. https://doi.org/10.1093/mnras/stz691
Lovell, Mark R. ; Barnes, David ; Bahé, Yannick ; Schaye, Joop ; Schaller, Matthieu ; Theuns, Tom ; Bose, Sownak ; Crain, Robert A. ; Dalla Vecchia, Claudio ; Frenk, Carlos S. ; Hellwing, Wojciech ; Kay, Scott T. ; Ludlow, Aaron D. ; Bower, Richard G. / The signal of decaying dark matter with hydrodynamical simulations. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 485, No. 3. pp. 4071-4089.
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Lovell, MR, Barnes, D, Bahé, Y, Schaye, J, Schaller, M, Theuns, T, Bose, S, Crain, RA, Dalla Vecchia, C, Frenk, CS, Hellwing, W, Kay, ST, Ludlow, AD & Bower, RG 2019, 'The signal of decaying dark matter with hydrodynamical simulations' Monthly Notices of the Royal Astronomical Society, vol. 485, no. 3, pp. 4071-4089. https://doi.org/10.1093/mnras/stz691

The signal of decaying dark matter with hydrodynamical simulations. / Lovell, Mark R.; Barnes, David; Bahé, Yannick; Schaye, Joop; Schaller, Matthieu; Theuns, Tom; Bose, Sownak; Crain, Robert A.; Dalla Vecchia, Claudio; Frenk, Carlos S.; Hellwing, Wojciech; Kay, Scott T.; Ludlow, Aaron D.; Bower, Richard G.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, No. 3, 28.02.2019, p. 4071-4089.

Research output: Contribution to journalArticle

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AU - Lovell, Mark R.

AU - Barnes, David

AU - Bahé, Yannick

AU - Schaye, Joop

AU - Schaller, Matthieu

AU - Theuns, Tom

AU - Bose, Sownak

AU - Crain, Robert A.

AU - Dalla Vecchia, Claudio

AU - Frenk, Carlos S.

AU - Hellwing, Wojciech

AU - Kay, Scott T.

AU - Ludlow, Aaron D.

AU - Bower, Richard G.

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Lovell MR, Barnes D, Bahé Y, Schaye J, Schaller M, Theuns T et al. The signal of decaying dark matter with hydrodynamical simulations. Monthly Notices of the Royal Astronomical Society. 2019 Feb 28;485(3):4071-4089. https://doi.org/10.1093/mnras/stz691