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Title: Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter

Journal Article · · Physical Review D
 [1]; ORCiD logo [2]
  1. Univ. of Wisconsin, Madison, WI (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)

Primordial black holes (PBHs) with a mass from 10-16 to 10-11 M may comprise 100% of dark matter. Due to a combination of wave and finite source size effects, the traditional microlensing of stars does not probe this mass range. Here, we point out that x-ray pulsars with higher photon energies and smaller source sizes are good candidate sources for microlensing for this mass window. Among the existing x-ray pulsars, the Small Magellanic Cloud (SMC) X-1 source is found to be the best candidate because of its apparent brightness and long distance from Earth. We have analyzed the existing observation data of SMC X-1 by the RXTE telescope (around 10 days) and found that PBH as 100% of dark matter is close to but not yet excluded. Lastly, future longer observation of this source by x-ray telescopes with larger effective areas such as AstroSat, Athena, Lynx, and eXTP can potentially close the last mass window where PBHs can make up all of dark matter.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359; SC0017647
OSTI ID:
1570845
Alternate ID(s):
OSTI ID: 1546269
Report Number(s):
arXiv:1812.01427; FERMILAB-PUB-19-516-T; PRVDAQ; oai:inspirehep.net:1706804; TRN: US2100145
Journal Information:
Physical Review D, Vol. 99, Issue 12; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (2)

Revisiting constraints on asteroid-mass primordial black holes as dark matter candidates journal August 2019
Gamma-ray burst lensing parallax: Closing the primordial black hole dark matter mass window journal February 2020

Figures / Tables (5)