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http://hdl.handle.net/20.500.12386/34043
Title: | An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing | Authors: | Sahu, Kailash C. Anderson, Jay Casertano, Stefano Bond, Howard E. Udalski, Andrzej Dominik, Martin Calamida, Annalisa Bellini, Andrea Brown, Thomas M. Rejkuba, Marina Bajaj, Varun Kains, Noé Ferguson, Henry C. Fryer, Chris L. Yock, Philip Mróz, Przemek Kozłowski, Szymon Pietrukowicz, Paweł Poleski, Radek Skowron, Jan Soszyński, Igor Szymański, Michał K. Ulaczyk, Krzysztof Wyrzykowski, Łukasz Barry, Richard K. Bennett, David P. Bond, Ian A. Hirao, Yuki Silva, Stela Ishitani Kondo, Iona Koshimoto, Naoki Ranc, Clément Rattenbury, Nicholas J. Sumi, Takahiro Suzuki, Daisuke Tristram, Paul J. Vandorou, Aikaterini Beaulieu, Jean-Philippe Marquette, Jean-Baptiste Cole, Andrew Fouqué, Pascal Hill, Kym Dieters, Stefan Coutures, Christian Dominis-Prester, Dijana Bennett, Clara Bachelet, Etienne Menzies, John Albrow, Michael Pollard, Karen Gould, Andrew Yee, Jennifer C. Allen, William Almeida, Leonardo A. Christie, Grant Drummond, John Gal-Yam, Avishay Gorbikov, Evgeny Jablonski, Francisco Lee, Chung-Uk Maoz, Dan Manulis, Ilan McCormick, Jennie Natusch, Tim Pogge, Richard W. Shvartzvald, Yossi Jørgensen, Uffe G. Alsubai, Khalid A. Andersen, Michael I. Bozza, Valerio Novati, Sebastiano Calchi Burgdorf, Martin Hinse, Tobias C. Hundertmark, Markus Husser, Tim-Oliver Kerins, Eamonn Longa-Peña, Penelope Mancini, Luigi Penny, Matthew Rahvar, Sohrab RICCI, Davide Sajadian, Sedighe Skottfelt, Jesper Snodgrass, Colin Southworth, John Tregloan-Reed, Jeremy Wambsganss, Joachim Wertz, Olivier Tsapras, Yiannis Street, Rachel A. Bramich, D. M. Horne, Keith Steele, Iain A. RoboNet Collaboration RICCI, Davide |
Issue Date: | 2022 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 933 | Issue: | 1 | First Page: | 83 | 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 <SUB>E</SUB> ≃ 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 <SUB>⊙</SUB> 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<SUP>-1</SUP>, 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. *This research is based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. | URI: | http://hdl.handle.net/20.500.12386/34043 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac739e https://api.elsevier.com/content/abstract/scopus_id/85134804867 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac739e | Bibcode ADS: | 2022ApJ...933...83S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Sahu_2022_ApJ_933_83.pdf | Pdf editoriale | 6.37 MB | Adobe PDF | View/Open |
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