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

L. Wyrzykowski; J. Skowron; S. Kozlowski; A. Udalski; M. K. Szymański; M. Kubiak; G. Pietrzyński; I. Soszyński; O. Szewczyk; K. Ulaczyk; R. Poleski; P. Tisserand

doi:10.1111/j.1365-2966.2011.19243.x

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

L. Wyrzykowski^*, J. Skowron, S. Kozlowski, A. Udalski, M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, O. Szewczyk, K. Ulaczyk, R. Poleski, P. Tisserand

^*Corresponding author for this work

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Abstract

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 τ_SMC-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.

Original language	English
Pages (from-to)	2949-2961
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	416
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2011.19243.x
Publication status	Published - Oct 2011

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Wyrzykowski, L., Skowron, J., Kozlowski, S., Udalski, A., Szymański, M. K., Kubiak, M., Pietrzyński, G., Soszyński, I., Szewczyk, O., Ulaczyk, K., Poleski, R., & Tisserand, P. (2011). The OGLE view of microlensing towards the Magellanic Clouds - IV. OGLE-III SMC data and final conclusions on MACHOs. Monthly Notices of the Royal Astronomical Society, 416(4), 2949-2961. https://doi.org/10.1111/j.1365-2966.2011.19243.x

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

abstract = "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.",

keywords = "Dark matter, Galaxy: halo, Galaxy: structure",

author = "L. Wyrzykowski and J. Skowron and S. Kozlowski and A. Udalski and Szyma{\'n}ski, {M. K.} and M. Kubiak and G. Pietrzy{\'n}ski and I. Soszy{\'n}ski and O. Szewczyk and K. Ulaczyk and R. Poleski and P. Tisserand",

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doi = "10.1111/j.1365-2966.2011.19243.x",

language = "English",

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Wyrzykowski, L, Skowron, J, Kozlowski, S, Udalski, A, Szymański, MK, Kubiak, M, Pietrzyński, G, Soszyński, I, Szewczyk, O, Ulaczyk, K, Poleski, R & Tisserand, P 2011, 'The OGLE view of microlensing towards the Magellanic Clouds - IV. OGLE-III SMC data and final conclusions on MACHOs', Monthly Notices of the Royal Astronomical Society, vol. 416, no. 4, pp. 2949-2961. https://doi.org/10.1111/j.1365-2966.2011.19243.x

TY - JOUR

T1 - The OGLE view of microlensing towards the Magellanic Clouds - IV. OGLE-III SMC data and final conclusions on MACHOs

AU - Wyrzykowski, L.

AU - Skowron, J.

AU - Kozlowski, S.

AU - Udalski, A.

AU - Szymański, M. K.

AU - Kubiak, M.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Szewczyk, O.

AU - Ulaczyk, K.

AU - Poleski, R.

AU - Tisserand, P.

PY - 2011/10

Y1 - 2011/10

N2 - 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.

AB - 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.

KW - Dark matter

KW - Galaxy: halo

KW - Galaxy: structure

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U2 - 10.1111/j.1365-2966.2011.19243.x

DO - 10.1111/j.1365-2966.2011.19243.x

M3 - Article

SN - 0035-8711

VL - 416

SP - 2949

EP - 2961

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

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