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Properties of resonantly produced sterile neutrino dark matter subhaloes

Horiuchi, Shunsaku and Bozek, Brandon and Abazajian, Kevork N. and Boylan-Kolchin, Michael and Bullock, James S. and Garrison-Kimmel, Shea and Oñorbe, José (2016) Properties of resonantly produced sterile neutrino dark matter subhaloes. Monthly Notices of the Royal Astronomical Society, 456 (4). pp. 4346-4353. ISSN 0035-8711.

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The anomalous 3.55 keV X-ray line recently detected towards a number of massive dark matter objects may be interpreted as the radiative decays of 7.1 keV mass sterile neutrino dark matter. Depending on its parameters, the sterile neutrino can range from cold to warm dark matter with small-scale suppression that differs in form from commonly adopted thermal warm dark matter. Here, we numerically investigate the subhalo properties for 7.1 keV sterile neutrino dark matter produced via the resonant Shi–Fuller mechanism. Using accurate matter power spectra, we run cosmological zoom-in simulations of a Milky Way-sized halo and explore the abundance of massive subhaloes, their radial distributions, and their internal structure. We also simulate the halo with thermal 2.0 keV warm dark matter for comparison and discuss quantitative differences. We find that the resonantly produced sterile neutrino model for the 3.55 keV line provides a good description of structures in the Local Group, including the number of satellite dwarf galaxies and their radial distribution, and largely mitigates the too-big-to-fail problem. Future searches for satellite galaxies by deep surveys, such as the Dark Energy Survey, Large Synoptic Survey Telescope, and Wide Field Infrared Survey Telescope, will be a strong direct test of warm dark matter scenarios.

Item Type:Article
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URLURL TypeDescription Paper
Abazajian, Kevork N.0000-0001-9919-6362
Boylan-Kolchin, Michael0000-0002-9604-343X
Bullock, James S.0000-0003-4298-5082
Garrison-Kimmel, Shea0000-0002-4655-8128
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 December 10. Received 2015 December 10; in original form 2015 October 28. First published online January 15, 2016. We thank Tejaswi Venumadhav and Francis-YanCyr-Racine for discussions and for providing digitized data of sterile neutrino transfer functions. SH and KNA acknowledge support from the Institute for Nuclear Theory programme ‘Neutrino Astrophysics and Fundamental Properties’ 15-2a where part of this work was done. KNA is partially supported by NSF CAREER Grant No. PHY-1159224 and NSF Grant No. PHY-1316792. MBK acknowledges support provided by NASA through HST theory grants (programs AR-12836 and AR-13888) from the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. Support for SGK. was provided by NASA through Einstein Postdoctoral Fellowship grant number PF5-160136 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060.
Funding AgencyGrant Number
Institute for Nuclear TheoryUNSPECIFIED
NASA Hubble FellowshipAR-12836
NASA Hubble FellowshipAR-13888
Space Telescope Science InstituteUNSPECIFIED
NASA Einstein FellowshipPF5-160136
Subject Keywords: Galaxy: halo Local Group cosmology: theory dark matter
Issue or Number:4
Record Number:CaltechAUTHORS:20160408-082149794
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Official Citation:Shunsaku Horiuchi, Brandon Bozek, Kevork N. Abazajian, Michael Boylan-Kolchin, James S. Bullock, Shea Garrison-Kimmel, and Jose Onorbe Properties of resonantly produced sterile neutrino dark matter subhaloes MNRAS (March 11, 2016) Vol. 456 4346-4353 doi:10.1093/mnras/stv2922 First published online January 15, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66010
Deposited By: Ruth Sustaita
Deposited On:08 Apr 2016 15:52
Last Modified:09 Mar 2020 13:18

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