Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter
Abstract
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.
- Authors:
-
[2]
- Univ. of Wisconsin, Madison, WI (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1570845
- Alternate Identifier(s):
- OSTI ID: 1546269
- Report Number(s):
- arXiv:1812.01427; FERMILAB-PUB-19-516-T
Journal ID: ISSN 2470-0010; PRVDAQ; oai:inspirehep.net:1706804; TRN: US2100145
- Grant/Contract Number:
- AC02-07CH11359; SC0017647
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Bai, Yang, and Orlofsky, Nicholas. Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.99.123019.
Bai, Yang, & Orlofsky, Nicholas. Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter. United States. https://doi.org/10.1103/PhysRevD.99.123019
Bai, Yang, and Orlofsky, Nicholas. Mon .
"Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter". United States. https://doi.org/10.1103/PhysRevD.99.123019. https://www.osti.gov/servlets/purl/1570845.
@article{osti_1570845,
title = {Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter},
author = {Bai, Yang and Orlofsky, Nicholas},
abstractNote = {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.},
doi = {10.1103/PhysRevD.99.123019},
journal = {Physical Review D},
number = 12,
volume = 99,
place = {United States},
year = {Mon Jun 24 00:00:00 EDT 2019},
month = {Mon Jun 24 00:00:00 EDT 2019}
}
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Figures / Tables:
Figure 1: The averaged magnification factor $\bar{µ}$ for a range of photon energies as a function of y defined as the ratio of the tangential source-lens separation in the lens plane over the Einstein radius. The source is assumed to be point-like for this plot. The black and dashed linemore »
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journal, August 2019
- Montero-Camacho, Paulo; Fang, Xiao; Vasquez, Gabriel
- Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 08
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