First M87 Event Horizon Telescope Results. III. Data Processing and Calibration | |
Akiyama, 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 | |
刊名 | ASTROPHYSICAL JOURNAL LETTERS |
2019-04-10 | |
卷号 | 875期号:1页码:32 |
关键词 | black hole physics galaxies: individual (M87, 3C279) galaxies: jets techniques: high angular resolution techniques: interferometric |
ISSN号 | 2041-8205 |
DOI | 10.3847/2041-8213/ab0c57 |
通讯作者 | Akiyama, Kazunori() |
英文摘要 | We present the calibration and reduction of Event Horizon Telescope (EHT) 1.3 mm radio wavelength observations of the supermassive black hole candidate at the center of the radio galaxy M87 and the quasar 3C 279, taken during the 2017 April 5-11 observing campaign. These global very long baseline interferometric observations include for the first time the highly sensitive Atacama Large Millimeter/submillimeter Array (ALMA); reaching an angular resolution of 25 mu as, with characteristic sensitivity limits of similar to 1 mJy on baselines to ALMA and similar to 10 mJy on other baselines. The observations present challenges for existing data processing tools, arising from the rapid atmospheric phase fluctuations, wide recording bandwidth, and highly heterogeneous array. In response, we developed three independent pipelines for phase calibration and fringe detection, each tailored to the specific needs of the EHT. The final data products include calibrated total intensity amplitude and phase information. They are validated through a series of quality assurance tests that show consistency across pipelines and set limits on baseline systematic errors of 2% in amplitude and 1 degrees in phase. The M87 data reveal the presence of two nulls in correlated flux density at similar to 3.4 and similar to 8.3 G lambda and temporal evolution in closure quantities, indicating intrinsic variability of compact structure on a. timescale of days, or several light-crossing times for a. few billion solar-mass black hole. These measurements provide the first opportunity to image horizon-scale structure in M87. |
WOS关键词 | SUPERMASSIVE BLACK-HOLE ; MILLIMETER ; EFFICIENT |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000464210800003 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/24588] |
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 Catedrat 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. III. Data Processing and Calibration[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,875(1):32. |
APA | Akiyama, Kazunori.,Alberdi, Antxon.,Alef, Walter.,Asada, Keiichi.,Azulay, Rebecca.,...&Yamaguchi, Paul.(2019).First M87 Event Horizon Telescope Results. III. Data Processing and Calibration.ASTROPHYSICAL JOURNAL LETTERS,875(1),32. |
MLA | Akiyama, Kazunori,et al."First M87 Event Horizon Telescope Results. III. Data Processing and Calibration".ASTROPHYSICAL JOURNAL LETTERS 875.1(2019):32. |
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