Dr Mark Lovell m.r.lovell@durham.ac.uk
Technical Manager
Simulating the Dark Matter Decay Signal from the Perseus Galaxy Cluster
Lovell, Mark R.; Iakubovskyi, Dmytro; Barnes, David; Bose, Sownak; Frenk, Carlos S.; Theuns, Tom; Hellwing, Wojciech A.
Authors
Dmytro Iakubovskyi
David Barnes
Sownak Bose
Carlos S. Frenk
Professor Tom Theuns tom.theuns@durham.ac.uk
Professor
Wojciech A. Hellwing
Abstract
the C-EAGLE simulations of galaxy clusters to predict the flux, width, and shape of a dark matter decay line, paying particular attention to the unexplained 3.55keV line detected in the spectra of some galaxies and clusters, and the upcoming XRISM X-ray observatory mission. We show that the line width in C-EAGLE clusters similar to Perseus is typically [600–800]km s-1, and therefore narrower than the amplitude of the velocity dispersion of galaxies in the cluster. Halos that are significantly disturbed can, however, exhibit galaxy velocity dispersions higher than 1000km s-1, and in this case will show a large difference between the line profiles of on- and offcenter observations. We show that the line profile is likely to be slightly asymmetric, but still well approximated by a Gaussian at the 10% level, and that the halo asymmetry can lead to fluxes that vary by a factor of two. In summary, we predict that, if the previously reported 3.55keV line detections do originate from dark matter decay, the XRISM mission will detect a line with a roughly Gaussian profile at a rest-frame energy of 3.55keV, with a width >600 km s-1and flux approximately in the range [4–9] ´ 10-8 counts s-1 cm-2.
Citation
Lovell, M. R., Iakubovskyi, D., Barnes, D., Bose, S., Frenk, C. S., Theuns, T., & Hellwing, W. A. (2019). Simulating the Dark Matter Decay Signal from the Perseus Galaxy Cluster. Astrophysical Journal Letters, 875(2), Article L24. https://doi.org/10.3847/2041-8213/ab13ac
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 26, 2019 |
Online Publication Date | Apr 19, 2019 |
Publication Date | Apr 19, 2019 |
Deposit Date | May 9, 2019 |
Publicly Available Date | Mar 29, 2024 |
Journal | Astrophysical Journal |
Print ISSN | 2041-8205 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 875 |
Issue | 2 |
Article Number | L24 |
DOI | https://doi.org/10.3847/2041-8213/ab13ac |
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© 2019. The American Astronomical Society. All rights reserved.
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