An Isolated Stellar-Mass Black Hole Detected Through Astrometric Microlensing

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, in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of six years, reveals a clear relativistic astrometric deflection of the background star's apparent position. Ground-based photometry shows a parallactic signature of the effect of the 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_Sun 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, suggesting that the BH received a modest 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 ever for an isolated stellar-mass BH using any technique

Analisi statistica dei dati testuali

3rd International Conference on Statistical Analysis of Textual Data, Rome 11-13 December 1995; v.1. Supported by CNR, ISTAT, Telecom ItaliaConsiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

Levy's stochastic area in stochastic mechanics

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

How to recognize the order of infinitesimal mechanisms A numerical approach

SIGLEAvailable from British Library Document Supply Centre- DSC:9106.17(CUED/D-STRUCT/TR--131) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Analisi statistica dei dati testuali

3rd International Conference on Statistical Analysis of Textual Data, Rome 11-13 Dec 1995; v.II. Supported by CNR, ISTAT, Telecom ItaliaConsiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

Des gammes de produits

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : DO 706 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Politique d'abandon de produit

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : DO 707 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Une approche cognitive des facteurs de reussite des nouveaux produits

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : DO 696 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

A route to stochastic mechanics

To appear in: Proc. 1. Int. Ascona-Como Meeting 'Stochastic processes in Classical and Quantum Systems'SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman