BLAINEAU, T.; MONIEZ, M.; AFONSO, C.; ALBERT, J.-N.; ANSARI, R.; AUBOURG, E.; COUTURES, C.; GLICENSTEIN, J.-F.; GOLDMAN, B.; HAMADACHE, C.; LASSERRE, T.; LE GUILLOU, L.; LESQUOY, E.; MAGNEVILLE, C.; MARQUETTE, J.-B.; PALANQUE-DELABROUILLE, N.; PERDEREAU, O.; RICH, J.; SPIRO, M.; TISSERAND, P.

doi:10.1051/0004-6361/202243430

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BLAINEAU, T.
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie [IJCLab]

MONIEZ, M.
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie [IJCLab]

AFONSO, C.
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]

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Astronomy and Astrophysics - A&A. 2022, vol. 664, p. A106

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We searched for long-duration microlensing events originating from intermediate-mass black holes (BH) in the halo of the Milky Way, using archival data from the EROS-2 and MACHO photometric surveys towards the Large Magellanic Cloud (LMC). We combined data from these two surveys to create a common database of light curves for 14.1 million objects in the LMC, covering a total duration of 10.6 years, with flux series measured in four wide passbands. We carried out a microlensing search on these light curves, complemented by the light curves of 22.7 million objects, observed only by EROS-2 or only by MACHO, over about 7 years, with flux series measured in only two passbands. A likelihood analysis, taking into account the LMC self-lensing and Milky Way disk contributions, allows us to conclude that compact objects with masses in the range 10 − 100 M⊙ cannot make up more than ∼15% of a standard halo total mass (at a 95% confidence level). Our analysis sensitivity weakens for heavier objects, although we still rule out the possibility of ∼50% of the halo being made of ∼1000 M⊙ BHs. Combined with previous EROS results, an upper limit of ∼15% of the total halo mass can be obtained for the contribution of compact halo objects in the mass range 10−6 − 102 M⊙.Key words: gravitational lensing: micro / surveys / stars: black holes / Galaxy: halo / Galaxy: kinematics and dynamics / dark matter< Réduire

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gravitational lensing: micro

surveys

stars: black holes

Galaxy: halo

Galaxy: kinematics and dynamics

dark matter

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New limits from microlensing on Galactic black holes in the mass range 10 M⊙ < M < 1000 M⊙

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