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Titel:An isolated stellar-mass black hole detected through astrometric microlensing
Mitwirkende:Sahu, Kailash C. [VerfasserIn]   i
 Ranc, Clément [VerfasserIn]   i
 Hundertmark, Markus [VerfasserIn]   i
 Wambsganß, Joachim [VerfasserIn]   i
 Tsapras, Yiannis [VerfasserIn]   i
Verf.angabe:Kailash C. Sahu, Clément Ranc, Markus Hundertmark, Joachim Wambsganss, Yiannis Tsapras [und 93 weitere Personen]
E-Jahr:2022
Jahr:2022 July 6
Umfang:28 S.
Fussnoten:Gesehen am 20.02.2023
Titel Quelle:Enthalten in: The astrophysical journal / 1
Ort Quelle:London : Institute of Physics Publ., 1995
Jahr Quelle:2022
Band/Heft Quelle:933(2022) vom: Juli, Artikel-ID 83, Seite 1-28
ISSN Quelle:1538-4357
Abstract:We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of 6 yr, reveals a clear relativistic astrometric deflection of the background star’s apparent position. Ground-based photometry of MOA-11-191/OGLE-11-462 shows a parallactic signature of the effect of Earth’s motion on the microlensing light curve. Combining the HST astrometry with the ground-based light curve and the derived parallax, we obtain a lens mass of 7.1 ± 1.3 M ⊙ and a distance of 1.58 ± 0.18 kpc. We show that the lens emits no detectable light, which, along with having a mass higher than is possible for a white dwarf or neutron star, confirms its BH nature. Our analysis also provides an absolute proper motion for the BH. The proper motion is offset from the mean motion of Galactic disk stars at similar distances by an amount corresponding to a transverse space velocity of ∼45 km s−1, suggesting that the BH received a “natal kick” from its supernova explosion. Previous mass determinations for stellar-mass BHs have come from radial velocity measurements of Galactic X-ray binaries and from gravitational radiation emitted by merging BHs in binary systems in external galaxies. Our mass measurement is the first for an isolated stellar-mass BH using any technique.
DOI:doi:10.3847/1538-4357/ac739e
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.3847/1538-4357/ac739e
 Volltext: https://dx.doi.org/10.3847/1538-4357/ac739e
 DOI: https://doi.org/10.3847/1538-4357/ac739e
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1837089116
Verknüpfungen:→ Zeitschrift

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