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Event Horizon Telescope Collaboration;
Akiyama, Kazunori;
Alberdi, Antxon;
Alef, Walter;
Algaba, Juan Carlos;
Anantua, Richard;
Asada, Keiichi;
Azulay, Rebecca;
Bach, Uwe;
Baczko, Anne-Kathrin;
Ball, David;
Baloković, Mislav;
Barrett, John;
Bauböck, Michi;
Benson, Bradford A.;
Bintley, Dan;
Blackburn, Lindy;
Blundell, Raymond;
Bouman, Katherine L.;
Bower, Geoffrey C.;
Boyce, Hope;
Bremer, Michael;
Brinkerink, Christiaan D.;
Brissenden, Roger;
[...]
First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
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- Medientyp: E-Artikel
- Titel: First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
- Beteiligte: Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Bauböck, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; [...]
- Erschienen: American Astronomical Society, 2022
- Erschienen in: The Astrophysical Journal Letters
- Sprache: Nicht zu entscheiden
- DOI: 10.3847/2041-8213/ac6674
- ISSN: 2041-8205; 2041-8213
- Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
- Entstehung:
- Anmerkungen:
- Beschreibung: <jats:title>Abstract</jats:title> <jats:p>We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength of <jats:italic>λ</jats:italic> = 1.3 mm. The EHT data resolve a compact emission region with intrahour variability. A variety of imaging and modeling analyses all support an image that is dominated by a bright, thick ring with a diameter of 51.8 ± 2.3 <jats:italic>μ</jats:italic>as (68% credible interval). The ring has modest azimuthal brightness asymmetry and a comparatively dim interior. Using a large suite of numerical simulations, we demonstrate that the EHT images of Sgr A* are consistent with the expected appearance of a Kerr black hole with mass ∼4 × 10<jats:sup>6</jats:sup> <jats:italic>M</jats:italic> <jats:sub>⊙</jats:sub>, which is inferred to exist at this location based on previous infrared observations of individual stellar orbits, as well as maser proper-motion studies. Our model comparisons disfavor scenarios where the black hole is viewed at high inclination (<jats:italic>i</jats:italic> > 50°), as well as nonspinning black holes and those with retrograde accretion disks. Our results provide direct evidence for the presence of a supermassive black hole at the center of the Milky Way, and for the first time we connect the predictions from dynamical measurements of stellar orbits on scales of 10<jats:sup>3</jats:sup>–10<jats:sup>5</jats:sup> gravitational radii to event-horizon-scale images and variability. Furthermore, a comparison with the EHT results for the supermassive black hole M87* shows consistency with the predictions of general relativity spanning over three orders of magnitude in central mass.</jats:p>
- Zugangsstatus: Freier Zugang