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

doi:10.3847/2041-8213/ab0e85

	First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
	Akiyama, Kazunori 1,2,3,4; Alberdi, Antxon 5; Alef, Walter 6; Asada, Keiichi 7; Azulay, Rebecca 6,8,9; Baczko, Anne-Kathrin 6; Ball, David 10,11; Balokovic, Mislav 4,12; Barrett, John 2; Bintley, Dan 13
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2019-04-10
卷号	875 期号:1 页码:52
关键词	black hole physics galaxies: individual (M87) galaxies: jets techniques: high angular resolution techniques: image processing techniques: interferometric
ISSN号	2041-8205
DOI	10.3847/2041-8213/ab0e85
通讯作者	Akiyama, Kazunori()
英文摘要	We 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关键词	SELF-CALIBRATION ; HIGH-RESOLUTION ; JET ; INTERFEROMETRY ; RECONSTRUCTION ; IMPLEMENTATION ; DECONVOLUTION ; PRINCIPLES ; MOTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000464210800004
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/24453]
专题	中国科学院紫金山天文台
通讯作者	Akiyama, Kazunori
作者单位	1.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
推荐引用方式 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.