Event Horizon Telescope CollaborationAkiyama, KazunoriKazunoriAkiyamaAlberdi, AntxonAntxonAlberdiAlef, WalterWalterAlefAlgaba, Juan CarlosJuan CarlosAlgabaAnantua, RichardRichardAnantuaAsada, KeiichiKeiichiAsadaAzulay, RebeccaRebeccaAzulayBach, UweUweBachBaczko, Anne-KathrinAnne-KathrinBaczkoBall, DavidDavidBallBaloković, MislavMislavBalokovićBarrett, JohnJohnBarrettBauböck, MichiMichiBauböckBenson, Bradford A.Bradford A.BensonBintley, DanDanBintleyBlackburn, LindyLindyBlackburnBlundell, RaymondRaymondBlundellBouman, Katherine L.Katherine L.BoumanBower, Geoffrey C.Geoffrey C.BowerBoyce, HopeHopeBoyceBremer, MichaelMichaelBremerBrinkerink, Christiaan D.Christiaan D.BrinkerinkBrissenden, RogerRogerBrissendenBritzen, SilkeSilkeBritzenBroderick, Avery E.Avery E.BroderickBroguiere, DominiqueDominiqueBroguiereBronzwaer, ThomasThomasBronzwaerBustamante, SandraSandraBustamanteByun, Do-YoungDo-YoungByunCarlstrom, John E.John E.CarlstromCeccobello, ChiaraChiaraCeccobelloChael, AndrewAndrewChaelChan, Chi-kwanChi-kwanChanChatterjee, KoushikKoushikChatterjeeChatterjee, ShamiShamiChatterjeeChen, Ming-TangMing-TangChenChen, YongjunYongjunChenCheng, XiaopengXiaopengChengCho, IljeIljeChoChristian, PierrePierreChristianConroy, Nicholas S.Nicholas S.ConroyConway, John E.John E.ConwayCordes, James M.James M.CordesCrawford, Thomas M.Thomas M.CrawfordCrew, Geoffrey B.Geoffrey B.CrewCruz-Osorio, AlejandroAlejandroCruz-OsorioCui, YuzhuYuzhuCuiDavelaar, JordyJordyDavelaarDe Laurentis, MariafeliciaMariafeliciaDe LaurentisDeane, RogerRogerDeaneDempsey, JessicaJessicaDempseyDesvignes, GregoryGregoryDesvignesDexter, JasonJasonDexterDhruv, VedantVedantDhruvDoeleman, Sheperd S.Sheperd S.DoelemanDougal, SeanSeanDougalDzib, Sergio A.Sergio A.DzibEatough, Ralph P.Ralph P.EatoughEmami, RaziehRaziehEmamiFalcke, HeinoHeinoFalckeFarah, JosephJosephFarahFish, Vincent L.Vincent L.FishFomalont, EdEdFomalontFord, H. AlysonH. AlysonFordFraga-Encinas, RaquelRaquelFraga-EncinasFreeman, William T.William T.FreemanFriberg, PerPerFribergFromm, Christian M.Christian M.FrommFuentes, AntonioAntonioFuentesGalison, PeterPeterGalisonGammie, Charles F.Charles F.GammieGarcía, RobertoRobertoGarcíaGentaz, OlivierOlivierGentazGeorgiev, BorisBorisGeorgievGoddi, CiriacoCiriacoGoddiGold, RomanRomanGoldGómez-Ruiz, Arturo I.Arturo I.Gómez-RuizGómez, José L.José L.GómezGu, MinfengMinfengGuGurwell, MarkMarkGurwellHada, KazuhiroKazuhiroHadaHaggard, DarylDarylHaggardHaworth, KariKariHaworthHecht, Michael H.Michael H.HechtHesper, RonaldRonaldHesperHeumann, DirkDirkHeumannHo, Luis C.Luis C.HoHo, PaulPaulHoHonma, MarekiMarekiHonmaHuang, Chih-Wei L.Chih-Wei L.HuangHuang, LeiLeiHuangHughes, David H.David H.HughesIkeda, ShiroShiroIkedaImpellizzeri, C. M. VioletteC. M. 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PeterF. PeterSchloerbSchonfeld, JonathanJonathanSchonfeldSchuster, Karl-FriedrichKarl-FriedrichSchusterShao, LijingLijingShaoShen, ZhiqiangZhiqiangShenSmall, DesDesSmallSohn, Bong WonBong WonSohnSooHoo, JasonJasonSooHooSouccar, KamalKamalSouccarSun, HeHeSunTazaki, FumieFumieTazakiTetarenko, Alexandra J.Alexandra J.TetarenkoTiede, PaulPaulTiedeTilanus, Remo P. J.Remo P. 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K.T. K.SridharanStahm, WilliamWilliamStahmStark, Anthony A.Anthony A.StarkTest, JohnJohnTestTorstensson, KarlKarlTorstenssonVenegas, PaulinaPaulinaVenegasWalther, CraigCraigWaltherWei, Ta-ShunTa-ShunWeiWhite, ChrisChrisWhiteWieching, GundolfGundolfWiechingWijnands, RudyRudyWijnandsWouterloot, Jan G. A.Jan G. A.WouterlootYu, Chen-YuChen-YuYuYu (于威), WeiWeiYu (于威)Zeballos, MilagrosMilagrosZeballos2025-03-032025-03-0320222041-8205http://hdl.handle.net/20.500.12386/36361We 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 λ = 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 μas (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<SUP>6</SUP> M <SUB>⊙</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 (i > 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<SUP>3</SUP>-10<SUP>5</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.STAMPAenArticle10.3847/2041-8213/ac66742-s2.0-85131912575https://api.elsevier.com/content/abstract/scopus_id/85131912575https://iopscience.iop.org/article/10.3847/2041-8213/ac66742022ApJ...930L..12EFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation