Doppler effect on indirect detection of dark matter using dark matter only simulations

Powell, Devon; Laha, Ranjan; Ng, Kenny C. Y.; Abel, Tom

doi:10.1103/PhysRevD.95.063012

Title: Doppler effect on indirect detection of dark matter using dark matter only simulations

Journal Article · Wed Mar 15 00:00:00 EDT 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.95.063012· OSTI ID:1369469

Powell, Devon ^[1]; Laha, Ranjan ^[1]; Ng, Kenny C. Y. ^[2]; Abel, Tom ^[1]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Weizmann Institute of Science, Rehovot (Israel)

Indirect detection of dark matter is a major avenue for discovery. However, baryonic backgrounds are diverse enough to mimic many possible signatures of dark matter. In this work, we study the newly proposed technique of dark matter velocity spectroscopy. The nonrotating dark matter halo and the Solar motion produce a distinct longitudinal dependence of the signal which is opposite in direction to that produced by baryons. Using collisionless dark matter only simulations of Milky Way like halos, we show that this new signature is robust and holds great promise. We develop mock observations by a high energy resolution x-ray spectrometer on a sounding rocket, the Micro-X experiment, to our test case, the 3.5 keV line. We show that by using six different pointings, Micro-X can exclude a constant line energy over various longitudes at ≥ 3σ. As a result, the halo triaxiality is an important effect, and it will typically reduce the significance of this signal. We emphasize that this new smoking gun in motion signature of dark matter is general and is applicable to any dark matter candidate which produces a sharp photon feature in annihilation or decay.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1369469

Alternate ID(s):: OSTI ID: 1347818

Journal Information:: Physical Review D, Vol. 95, Issue 6; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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