Limits from the grave: resurrecting Hitomi for decaying dark matter and forecasting leading sensitivity for XRISM

Autor:	Dessert, Christopher, Ning, Orion, Rodd, Nicholas L., Safdi, Benjamin R.
Rok vydání:	2023
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - High Energy Astrophysical Phenomena High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	The Hitomi X-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking for narrow X-ray lines arising from DM decays. Unfortunately, the satellite was lost shortly after launch, and to-date the only analysis using Hitomi for DM decay used data taken towards the Perseus cluster. In this work we present a significantly more sensitive search from an analysis of archival Hitomi data towards blank sky locations, searching for DM decaying in our own Milky Way. The soon-to-be-launched XRISM satellite will have nearly identical soft-X-ray spectral capabilities to Hitomi; we project the full-mission sensitivity of XRISM for analyses of their future blank-sky data, and we find that XRISM will have the leading sensitivity to decaying DM for masses between roughly 1 to 20 keV, with important implications for sterile neutrino and heavy axion-like particle DM scenarios. Comment: 7+6 pages, 3+8 figures, supplementary data at https://github.com/bsafdi/Hitomi_BSO_for_DM, video abstract at https://youtu.be/EXBo-WHwwMw
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2305.17160 Zobrazit plný text záznamu View this record from Arxiv