The OGLE view of microlensing towards the Magellanic Clouds – IV. OGLE-III SMC data and final conclusions on MACHOs

By L. Wyrzykowski, J. Skowron, S. Kozłowski, A. Udalski, M. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, O. Szewczyk, K. Ulaczyk and 2 more. 2011

179 citations recorded by the source corpus.

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 τSMC-OIII= 1.30 ± 1.01 × 10−7, consistent with the expected contribution from Galactic disc and SMC self-lensing. We report that event OGLE-SMC-03 is most likely a thick-disc lens candidate, the first of such type found towards the SMC. In this paper we also combined all OGLE Large Magellanic Cloud and SMC microlensing results in order to refine the conclusions on MACHOs. All but one of the 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 event 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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bce8c33e4876b57288f693f5dc703d11f8137ef8

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In Astronomy and Astrophysics

1. Florian Kuhnel
2. B. Carr
3. A. Cieplak
4. M. Lehner
5. K. Griest
6. Juan García-Bellido
7. K. Kohri

In Instrumentation

1. A. Cieplak
2. M. Lehner
3. Florian Kuhnel
4. K. Griest
5. B. Carr

Citations in the corpus

• EXPERIMENTAL LIMITS ON PRIMORDIAL BLACK HOLE DARK MATTER FROM THE FIRST 2 YR OF KEPLER DATA (2013, background): “…that together have eliminated MACHO DM (which includes PBH DM) in the mass range from 3 × 10−8 M to 30 M from being the entirety of the DM (Carr et al. 2010; Wyrzykowski et al. 2011a, 2011b; Tisserand et al. 2007; Yoo et al. 2004; Alcock et al. 1996, 1998, 2001, Renault et al. 1997; Griest 1991).”
• Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “[165] Lukasz Wyrzykowski et al.”