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Hitomi constraints on the 3.5 keV Line in the Perseus galaxy cluster

Hitomi constraints on the 3.5 keV Line in the Perseus galaxy cluster
Hitomi constraints on the 3.5 keV Line in the Perseus galaxy cluster
High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E≈ 3.5 {keV} emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The emission line expected for Perseus based on the XMM-Newton signal from the large cluster sample under the dark matter decay scenario is too faint to be detectable in the Hitomi data. However, the previously reported 3.5 keV flux from Perseus was anomalously high compared to the sample-based prediction. We find no unidentified line at the reported high flux level. Taking into account the XMM measurement uncertainties for this region, the inconsistency with Hitomi is at a 99% significance for a broad dark matter line and at 99.7% for a narrow line from the gas. We do not find anomalously high fluxes of the nearby faint K line or the Ar satellite line that were proposed as explanations for the earlier 3.5 keV detections. We do find a hint of a broad excess near the energies of high-n transitions of S xvi (E≃ 3.44 {keV} rest-frame)—a possible signature of charge exchange in the molecular nebula and another proposed explanation for the unidentified line. While its energy is consistent with XMM pn detections, it is unlikely to explain the MOS signal. A confirmation of this interesting feature has to wait for a more sensitive observation with a future calorimeter experiment.
dark matter, galaxies: clusters: individual: A426, galaxies: clusters: intracluster medium, X-rays: galaxies: clusters
2041-8205
1-9
Aharonian, F.A.
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Akamatsu, H.
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Akimoto, F.
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Allen, S.W.
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Angelini, L.
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Arnaud, K.A.
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Audard, M.
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Awaki, H.
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Blandford, R.D.
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Bulbul, E.
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Coppi, P.
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de Plaa, J.
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den Herder, J.-W.
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Done, C.
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Dotani, T.
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Ebisawa, K.
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Enoto, T.
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Ezoe, Y.
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Fabian, A.C.
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Foster, A.R.
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Fujimoto, R.
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Fukazawa, Y.
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Furuzawa, A.
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Galeazzi, M.
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Gandhi, P.
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Giustini, M.
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Goldwurm, A.
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Gu, L.
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Guainazzi, M.
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Haba, Y.
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Hagino, K.
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Hamaguchi, K.
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Harrus, I.
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Hatsukade, I.
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Hayashi, K.
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Hughes, J.P.
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Kara, E.
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Smith, R.K.
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Hitomi Collaboration
Aharonian, F.A.
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Akamatsu, H.
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Akimoto, F.
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Allen, S.W.
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Angelini, L.
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Arnaud, K.A.
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Audard, M.
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Awaki, H.
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Axelsson, M.
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Bamba, A.
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Bautz, M.W.
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Blandford, R.D.
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Bulbul, E.
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Brown, G.V.
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Cackett, E.M.
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Chernyakova, M.
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Chiao, M.P.
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Coppi, P.
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Costantini, E.
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de Plaa, J.
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den Herder, J.-W.
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Done, C.
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Dotani, T.
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Ebisawa, K.
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Enoto, T.
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Ezoe, Y.
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Ferrigno, C.
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Foster, A.R.
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Fujimoto, R.
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Furuzawa, A.
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Galeazzi, M.
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Gallo, L.C.
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Gandhi, P.
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Giustini, M.
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Goldwurm, A.
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Gu, L.
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Guainazzi, M.
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Haba, Y.
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Hagino, K.
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Hamaguchi, K.
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Harrus, I.
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Hatsukade, I.
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Hayashi, K.
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Hughes, J.P.
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Kara, E.
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Smith, R.K.
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Aharonian, F.A., Akamatsu, H., Akimoto, F., Allen, S.W., Angelini, L., Arnaud, K.A., Audard, M., Awaki, H., Axelsson, M., Bamba, A., Bautz, M.W., Blandford, R.D., Bulbul, E., Brenneman, L.W., Brown, G.V., Cackett, E.M., Chernyakova, M., Chiao, M.P., Coppi, P., Costantini, E., de Plaa, J., den Herder, J.-W., Done, C., Dotani, T., Ebisawa, K., Eckart, M.E., Enoto, T., Ezoe, Y., Fabian, A.C., Ferrigno, C., Foster, A.R., Fujimoto, R., Fukazawa, Y., Furuzawa, A., Galeazzi, M., Gallo, L.C., Gandhi, P., Giustini, M., Goldwurm, A., Gu, L., Guainazzi, M., Haba, Y., Hagino, K., Hamaguchi, K., Harrus, I., Hatsukade, I., Hayashi, K., Hughes, J.P., Kara, E. and Smith, R.K. , Hitomi Collaboration (2017) Hitomi constraints on the 3.5 keV Line in the Perseus galaxy cluster. The Astrophysical Journal Letters, 837 (1), 1-9. (doi:10.3847/2041-8213/aa61fa).

Record type: Article

Abstract

High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E≈ 3.5 {keV} emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The emission line expected for Perseus based on the XMM-Newton signal from the large cluster sample under the dark matter decay scenario is too faint to be detectable in the Hitomi data. However, the previously reported 3.5 keV flux from Perseus was anomalously high compared to the sample-based prediction. We find no unidentified line at the reported high flux level. Taking into account the XMM measurement uncertainties for this region, the inconsistency with Hitomi is at a 99% significance for a broad dark matter line and at 99.7% for a narrow line from the gas. We do not find anomalously high fluxes of the nearby faint K line or the Ar satellite line that were proposed as explanations for the earlier 3.5 keV detections. We do find a hint of a broad excess near the energies of high-n transitions of S xvi (E≃ 3.44 {keV} rest-frame)—a possible signature of charge exchange in the molecular nebula and another proposed explanation for the unidentified line. While its energy is consistent with XMM pn detections, it is unlikely to explain the MOS signal. A confirmation of this interesting feature has to wait for a more sensitive observation with a future calorimeter experiment.

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Accepted/In Press date: 19 February 2017
e-pub ahead of print date: 1 March 2017
Published date: 3 March 2017
Keywords: dark matter, galaxies: clusters: individual: A426, galaxies: clusters: intracluster medium, X-rays: galaxies: clusters

Identifiers

Local EPrints ID: 413404
URI: https://eprints.soton.ac.uk/id/eprint/413404
ISSN: 2041-8205
PURE UUID: b328a7f1-2840-44f7-9145-f28190f4e330
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 23 Aug 2017 16:32
Last modified: 17 Sep 2019 00:40

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Contributors

Author: F.A. Aharonian
Author: H. Akamatsu
Author: F. Akimoto
Author: S.W. Allen
Author: L. Angelini
Author: K.A. Arnaud
Author: M. Audard
Author: H. Awaki
Author: M. Axelsson
Author: A. Bamba
Author: M.W. Bautz
Author: R.D. Blandford
Author: E. Bulbul
Author: L.W. Brenneman
Author: G.V. Brown
Author: E.M. Cackett
Author: M. Chernyakova
Author: M.P. Chiao
Author: P. Coppi
Author: E. Costantini
Author: J. de Plaa
Author: J.-W. den Herder
Author: C. Done
Author: T. Dotani
Author: K. Ebisawa
Author: M.E. Eckart
Author: T. Enoto
Author: Y. Ezoe
Author: A.C. Fabian
Author: C. Ferrigno
Author: A.R. Foster
Author: R. Fujimoto
Author: Y. Fukazawa
Author: A. Furuzawa
Author: M. Galeazzi
Author: L.C. Gallo
Author: P. Gandhi ORCID iD
Author: M. Giustini
Author: A. Goldwurm
Author: L. Gu
Author: M. Guainazzi
Author: Y. Haba
Author: K. Hagino
Author: K. Hamaguchi
Author: I. Harrus
Author: I. Hatsukade
Author: K. Hayashi
Author: J.P. Hughes
Author: E. Kara
Author: R.K. Smith

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