The OGLE view of microlensing towards the Magellanic Clouds - IV. OGLE-III SMC data and final conclusions on MACHOs★: The OGLE-III view of microlensing towards the SMC
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In this fourth part of the series presenting the Optical Gravitational Lensing Experiment (OGLE) microlensing studies of the dark matter halo compact objects (MACHOs) we describe results of the OGLE-III monitoring of the Small Magellanic Cloud (SMC). Three sound candidates for microlensing events were found and yielded the optical depth tau_SMC-OIII=1.30+-1.01 10^{-7}, consistent with the expected contribution from Galactic disk and SMC self-lensing. We report that event OGLE-SMC-03 is the most likely a thick disk lens candidate, the first of such type found towards the SMC. In this paper we also combined all OGLE Large and Small Magellanic Cloud microlensing results in order to refine the conclusions on MACHOs. All but one of OGLE events are most likely caused by the lensing by known populations of stars, therefore we concluded that there is no need for introducing any special dark matter compact objects in order to explain the observed events rates. Potential black hole event indicates that similar lenses can contribute only about 2 per cent to the total mass of the halo, which is still in agreement with the expected number of such objects.
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The framework yields testable predictions-such as primordial black-hole population and gravitational-wave backgrounds-that distinguish it observationally from both ΛCDM and other cyclic cosmologies.
“Moreover, the framework yields testable predictions—such as primordial black-hole population [20,21] and gravitational-wave backgrounds—that distinguish it observationally from both ΛCDM and other cyclic cosmologies [22].”
From Counting Cosmic Cycles: Past Big Crunches, Future Recurrence Limits, and the Age of the Quantum Memory Matrix Universe (2025) · cites this paper as [21]
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Reanalysis of the MACHO Constraints on PBH in the Light of Gaia DR3 Data
García-Bellido, J., & Hawkins, M. (2024) · Universe · doi:10.3390/universe10120449 · Cited by 19 · see citing works
Neukart, F., Marx, E., & Vinokur, V. (2025) · Entropy · doi:10.3390/e27101043 · Cited by 4 · see citing works
“Moreover, the framework yields testable predictions—such as primordial black-hole population [20,21] and gravitational-wave backgrounds—that distinguish it observationally from both Λ CDM and other cyclic cosmologies [22].”
- Authors
- Wyrzykowski, L., Skowron, J., Kozłowski, S., Udalski, A., Szymański, M. K., Kubiak, M., Pietrzyński, G., Soszyński, I., Szewczyk, O., Ulaczyk, K., Poleski, R., & Tisserand, P.
- ORCID
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2011-08-16
- Volume
- 416
- Issue
- 4
- Pages
- 2949-2961
- ISSN
- 0035-8711 (ISSN-L)
- OpenAlex
- W2127824069
- Cited by
- 205
- References
- 0
- Citations by year
- 2026: 6 · 2025: 16 · 2024: 25 · 2023: 19 · 2022: 17 · 2021: 22 · 2020: 21 · 2019: 12 · 2018: 23 · 2017: 8 · 2016: 8 · 2015: 9 · 2014: 5 · 2013: 6 · 2012: 6
- FWCI
- 3.08
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Americanae (AECID Library) (submittedVersion, cc-by-nc-nd)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-nd)
- ANU Open Research (Australian National University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Keywords
- gravitational microlensing, MACHOs, dark matter halos, Small Magellanic Cloud, OGLE-III, compact stars
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