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First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

文献类型:期刊论文

AuthorAkiyama, Kazunori1,2,3,4; Alberdi, Antxon5; Alef, Walter6; Asada, Keiichi7; Azulay, Rebecca6,8,9; Baczko, Anne-Kathrin6; Ball, David10,11; Balokovic, Mislav4,12; Barrett, John2; Bintley, Dan13
SourceASTROPHYSICAL JOURNAL LETTERS
Issued Date2019-04-10
Volume875Issue:1Pages:52
ISSN2041-8205
Keywordblack hole physics galaxies: individual (M87) galaxies: jets techniques: high angular resolution techniques: image processing techniques: interferometric
DOI10.3847/2041-8213/ab0e85
Corresponding AuthorAkiyama, Kazunori()
English AbstractWe present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of similar to 40 mu as, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. In the second stage, we reconstructed synthetic data from a large survey of imaging parameters and then compared the results with the corresponding ground truth images. This stage allowed us to select parameters objectively to use when reconstructing images of M87. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions.
WOS KeywordSELF-CALIBRATION ; HIGH-RESOLUTION ; JET ; INTERFEROMETRY ; RECONSTRUCTION ; IMPLEMENTATION ; DECONVOLUTION ; PRINCIPLES ; MOTION
WOS Research AreaAstronomy & Astrophysics
Language英语
WOS IDWOS:000464210800004
PublisherIOP PUBLISHING LTD
源URL[http://libir.pmo.ac.cn/handle/332002/24453]  
Collection中国科学院紫金山天文台
Corresponding AuthorAkiyama, Kazunori
Affiliation1.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
2.MIT, Haystack Observ, 99 Millstone Rd, Westford, MA 01886 USA
3.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
4.Harvard Univ, Black Hole Initiat, 20 Garden St, Cambridge, MA 02138 USA
5.CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain
6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
7.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan
8.Univ Valencia, Dept Astron & Astrofis, C Dr Moliner 50, E-46100 Valencia, Spain
9.Univ Valencia, Observ Astron, C Catedratico Jose Beltran 2, E-46980 Valencia, Spain
10.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
Recommended Citation
GB/T 7714
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,et al. First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,875(1):52.
APA Akiyama, Kazunori.,Alberdi, Antxon.,Alef, Walter.,Asada, Keiichi.,Azulay, Rebecca.,...&Yamaguchi, Paul.(2019).First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole.ASTROPHYSICAL JOURNAL LETTERS,875(1),52.
MLA Akiyama, Kazunori,et al."First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole".ASTROPHYSICAL JOURNAL LETTERS 875.1(2019):52.

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