First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
文献类型：期刊论文
| 作者 | Akiyama,Kazunori2,3,4,5; Alberdi,Antxon6; Alef,Walter7; Asada,Keiichi8; Azulay,Rebecca7,9,10; Baczko,Anne-Kathrin7; Ball,David11; Balokovi?,Mislav5,12; Barrett,John3; Bintley,Dan13 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2019-04-10 |
| 卷号 | 875期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | black hole physics galaxies: individual (M87, 3C279) galaxies: jets techniques: high angular resolution techniques: interferometric |
| DOI | 10.3847/2041-8213/ab0c57 |
| 英文摘要 | Abstract 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 μas, with characteristic sensitivity limits of ～1 mJy on baselines to ALMA and ～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° in phase. The M87 data reveal the presence of two nulls in correlated flux density at ～3.4 and ～8.3 Gλ 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. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-875-1-AB0C57 |
| 源URL | [http://119.78.226.72/handle/331011/31819]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Department of Physics, Broida Hall, University of California Santa Barbara, Santa Barbara, CA 93106, USA 2.National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903, USA 3.Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA 4.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 5.Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA 6.Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain 7.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 8.Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C. 9.Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, E-46100 Burjassot, València, Spain 10.Observatori Astronòmic, Universitat de València, C. Catedrático José Beltrán 2, E-46980 Paterna, València, Spain |
| 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]. The Astrophysical Journal Letters,2019,875(1). |
| 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.The Astrophysical Journal Letters,875(1). |
| MLA | Akiyama,Kazunori,et al."First M87 Event Horizon Telescope Results. III. Data Processing and Calibration".The Astrophysical Journal Letters 875.1(2019). |
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