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Microlensing mass measurement from images of rotating gravitational arcs

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dc.abstract.enGravitational microlensing<SUP>1</SUP> is a powerful technique for measuring the mass of isolated and faint or non-luminous objects in the Milky Way<SUP>2,3</SUP>. In most cases, however, additional observations to the photometric light curve are required to measure accurately the mass of the microlens. Long-baseline optical/infrared interferometry provides a new and efficient way to deliver such independent constraints<SUP>4-7</SUP>, as demonstrated recently by first interferometric observations in microlensing event TCP J05074264+2447555 (`Kojima-1')<SUP>8</SUP>. Here we report real-time observations of gravitationally lensed arcs in rotation around a microlens, Gaia19bld<SUP>9</SUP>, made with the PIONIER instrument<SUP>10</SUP> at the Very Large Telescope Interferometer. Our data allowed us to determine the angular separation and length of the arcs, as well as their rotation rate. Combining these measurements with ground-based photometric data enabled the determination of the microlens mass, M = 1.147 ± 0.029 M<SUB>⊙</SUB>, to a very high accuracy. We anticipate interferometric microlensing to play an important future role in the mass and distance determination of isolated stellar-mass black holes<SUP>11-13</SUP> in the Galaxy, which cannot be addressed by any other technique.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorWertz, Olivier
dc.contributor.authorCassan, Arnaud
dc.contributor.authorStreet, Rachel
dc.contributor.authorSurdej, Jean
dc.contributor.authorHundertmark, Markus
dc.contributor.authorBouquin, Jean-Baptiste Le
dc.contributor.authorBachelet, Étienne
dc.contributor.authorAbsil, Olivier
dc.contributor.authorRanc, Clément
dc.contributor.authorTsapras, Yiannis
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorWambsganss, Joachim
dc.date.accessioned2024-01-25T11:29:01Z
dc.date.available2024-01-25T11:29:01Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.volume6
dc.identifier.doi10.1038/S41550-021-01514-W
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112425
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022NatAs...6..121C
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofNature Astronomy
dc.relation.pages121-128
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleMicrolensing mass measurement from images of rotating gravitational arcs
dc.typeJournalArticle
dspace.entity.typePublication