Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole




Julkaisun tekijät: Akiyama K, Alberdi A, Alef W, Algaba JC, Anantua R, Asada K, Azulay R, Bach U, Baczko AK, Ball D, Balokovic M, Barrett J, Baubock M, Benson BA, Bintley D, Blackburn L, Blundell R, Bouman KL, Bower GC, Boyce H, Bremer M, Brinkerink CD, Brissenden R, Britzen S, Broderick AE, Broguiere D, Bronzwaer T, Bustamante S, Byun DY, Carlstrom JE, Ceccobello C, Chael A, Chan CK, Chatterjee K, Chatterjee S, Chen MT, Chen YJ, Cheng XP, Cho I, Christian P, Conroy NS, Conway JE, Cordes JM, Crawford TM, Crew GB, Cruz-Osorio A, Cui YZ, Davelaar J, De Laurentis M, Deane R, Dempsey J, Desvignes G, Dexter J, Dhruv V, Doeleman SS, Dougal S, Dzib SA, Eatough RP, Emami R, Falcke H, Farah J, Fish VL, Fomalont E, Ford HA, Fraga-Encinas R, Freeman WT, Friberg P, Fromm CM, Fuentes A, Galison P, Gammie CF, Garcia R, Gentaz O, Georgiev B, Goddi C, Gold R, Gomez-Ruiz AI, Gomez JL, Gu MF, Gurwell M, Hada K, Haggard D, Haworth K, Hecht MH, Hesper R, Heumann D, Ho LC, Ho P, Honma M, Huang CWL, Huang L, Hughes DH, Ikeda S, Impellizzeri CMV, Inoue M, Issaoun S, James DJ, Jannuzi BT, Janssen M, Jeter B, Jiang W, Jimenez-Rosales A, Johnson MD, Jorstad S, Joshi AV, Jung T, Karami M, Karuppusamy R, Kawashima T, Keating GK, Kettenis M, Kim DJ, Kim JY, Kim J, Kim J, Kino M, Koay JY, Kocherlakota P, Kofuji Y, Koch PM, Koyama S, Kramer C, Kramer M, Krichbaum TP, Kuo CY, La Bella N, Lauer TR, Lee D, Lee SS, Leung PK, Levis A, Li ZY, Lico R, Lindahl G, Lindqvist M, Lisakov M, Liu J, Liu K, Liuzzo E, Lo WP, Lobanov AP, Loinard L, Lonsdale CJ, Lu RS, Mao JR, Marchili N, Markoff S, Marrone DP, Marscher AP, Marti-Vidal I, Matsushita S, Matthews LD, Medeiros L, Menten KM, Michalik D, Mizuno I, Mizuno Y, Moran JM, Moriyama K, Moscibrodzka M, Muller C, Mus A, Musoke G, Myserlis I, Nadolski A, Nagai H, Nagar NM, Nakamura M, Narayan R, Narayanan G, Natarajan I, Nathanail A, Fuentes SN, Neilsen J, Neri R, Ni CC, Noutsos A, Nowak MA, Oh J, Okino H, Olivares H, Ortiz-Leon GN, Oyama T, Ozel F, Palumbo DCM, Paraschos GF, Park J, Parsons H, Patel N, Pen UL, Pesce DW, Pietu V, Plambeck R, PopStefanija A, Porth O, Potzl FM, Prather B, Preciado-Lopez JA, Psaltis D, Pu HY, Ramakrishnan V, Rao R, Rawlings MG, Raymond AW, Rezzolla L, Ricarte A, Ripperda B, Roelofs F, Rogers A, Ros E, Romero-Canizales C, Roshanineshat A, Rottmann H, Roy AL, Ruiz I, Ruszczyk C, Rygl KLJ, Sanchez S, Sanchez-Arguelles D, Sanchez-Portal M, Sasada M, Satapathy K, Savolainen T, Schloerb FP, Schonfeld J, Schuster KF, Shao LJ, Shen ZQ, Small D, Sohn BW, SooHoo J, Souccar K, Tazaki F, Tetarenko AJ, Tiede P, Tilanus RPJ, Titus M, Torne P, Traianou E, Trent T, Trippe S, Turk M, van Bemmel I, van Langevelde HJ, van Rossum DR, Vos J, Wagner J, Ward-Thompson D, Wardle J, Weintroub J, Wex N, Wharton R, Wielgus M, Wiik K, Witzel G, Wondrak MF, Wong GN, Wu QW, Yamaguchi P, Yoon D, Young A, Young K, Younsi Z, Yuan F, Yuan YF, Zensus JA, Zhang S, Zhao GY, Zhao SS

Kustantaja: IOP Publishing Ltd

Julkaisuvuosi: 2022

Journal: Astrophysical Journal Letters

Tietokannassa oleva lehden nimi: ASTROPHYSICAL JOURNAL LETTERS

Lehden akronyymi: ASTROPHYS J LETT

Volyymi: 930

Julkaisunumero: 2

Sivujen määrä: 64

ISSN: 2041-8205

eISSN: 2041-8213

DOI: http://dx.doi.org/10.3847/2041-8213/ac6429

Verkko-osoite: https://doi.org/10.3847/2041-8213/ac6429

Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/175637230


Tiivistelmä

We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm. Imaging of Sgr A* has been conducted through surveys over a wide range of imaging assumptions using the classical CLEAN algorithm, regularized maximum likelihood methods, and a Bayesian posterior sampling method. Different prescriptions have been used to account for scattering effects by the interstellar medium toward the Galactic center. Mitigation of the rapid intraday variability that characterizes Sgr A* has been carried out through the addition of a "variability noise budget" in the observed visibilities, facilitating the reconstruction of static full-track images. Our static reconstructions of Sgr A* can be clustered into four representative morphologies that correspond to ring images with three different azimuthal brightness distributions and a small cluster that contains diverse nonring morphologies. Based on our extensive analysis of the effects of sparse (u, v)-coverage, source variability, and interstellar scattering, as well as studies of simulated visibility data, we conclude that the Event Horizon Telescope Sgr A* data show compelling evidence for an image that is dominated by a bright ring of emission with a ring diameter of similar to ∼50 μas, consistent with the expected "shadow" of a 4 × 106 M black hole in the Galactic center located at a distance of 8 kpc.


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Last updated on 2022-08-08 at 13:03