SYMBA: An end-to-end VLBI synthetic data generation pipeline: Simulating Event Horizon Telescope observations of M 87

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Abstract Ämnesord

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Context. Realistic synthetic observations of theoretical source models are essential for our understanding of real observational data. In using synthetic data, one can verify the extent to which source parameters can be recovered and evaluate how various data corruption effects can be calibrated. These studies are the most important when proposing observations of new sources, in the characterization of the capabilities of new or upgraded instruments, and when verifying model-based theoretical predictions in a direct comparison with observational data. Aims. We present the SYnthetic Measurement creator for long Baseline Arrays (SYMBA), a novel synthetic data generation pipeline for Very Long Baseline Interferometry (VLBI) observations. SYMBA takes into account several realistic atmospheric, instrumental, and calibration effects. Methods. We used SYMBA to create synthetic observations for the Event Horizon Telescope (EHT), a millimetre VLBI array, which has recently captured the first image of a black hole shadow. After testing SYMBA with simple source and corruption models, we study the importance of including all corruption and calibration effects, compared to the addition of thermal noise only. Using synthetic data based on two example general relativistic magnetohydrodynamics (GRMHD) model images of M 87, we performed case studies to assess the image quality that can be obtained with the current and future EHT array for different weather conditions. Results. Our synthetic observations show that the effects of atmospheric and instrumental corruptions on the measured visibilities are significant. Despite these effects, we demonstrate how the overall structure of our GRMHD source models can be recovered robustly with the EHT2017 array after performing calibration steps, which include fringe fitting, a priori amplitude and network calibration, and self-calibration. With the planned addition of new stations to the EHT array in the coming years, images could be reconstructed with higher angular resolution and dynamic range. In our case study, these improvements allowed for a distinction between a thermal and a non-thermal GRMHD model based on salient features in reconstructed images.

Ämnesord

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
NATURVETENSKAP -- Data- och informationsvetenskap -- Datorseende och robotik (hsv//swe)
NATURAL SCIENCES -- Computer and Information Sciences -- Computer Vision and Robotics (hsv//eng)

Nyckelord

Techniques: interferometric
Telescopes
Techniques: high angular resolution
Atmospheric effects
Black hole physics
Galaxies: nuclei

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Av författaren/redakt...: Roelofs, F.; Janssen, Michael; Natarajan, Iniya ...; Deane, R. P.; Davelaar, Jordy; Olivares, Héctor; visa fler...; Porth, Oliver; Paine, S.N.; Bouman, K. L.; Tilanus, R. P. J ...; van Bemmel, I.; Falcke, H.D.; Akiyama, Kazunor ...; Alberdi, Antxon; Alef, Walter; Asada, K.; Azulay, R.; Baczko, A. K.; Ball, David; Baloković, Misla ...; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, W.; Bower, G. C.; Bremer, M.; Brinkerink, C. D ...; Brissenden, Roge ...; Britzen, Silke; Broderick, Avery ...; Broguière, D.; Bronzwaer, Thoma ...; Byun, Do Young; Carlstrom, J. E.; Chael, A.; Chan, Chi Kwan; Chatterjee, S.; Chatterjee, Kous ...; Chen, Ming Tang; Chen, Yongjun; Cho, I.; Christian, Pierr ...; Conway, John, 19 ...; Cordes, James M.; Crew, G.; Cui, Yuzhu; De Laurentis, Ma ...; Dempsey, Jessica; Desvignes, Grego ...; Dexter, Jason; Doeleman, S.; Eatough, Ralph P ...; Fish, V.; Fomalont, E.; Fraga-Encinas, R ...; Friberg, P.; Fromm, Christian ...; Gomez, J. L.; Galison, Peter; Gammie, Charles ...; Garcia, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, C.; Gold, R.; Gu, Minfeng; Gurwell, M.; Hada, K.; Hecht, Michael H ...; Hesper, R.; Ho, Luis C.; Ho, P.; Honma, M.; Huang, C.L.; Huang, Lei; Hughes, D.; Ikeda, S.; Inoue, Makoto; Issaoun, S.; James, David J.; Jannuzi, Buell T ...; Jeter, Britton; Jiang, Wu; Johnson, Michael ...; Jorstad, S.G.; Jung, Taehyun; Karami, Mansour; Karuppusamy, R.; Kawashima, Tomoh ...; Keating, G.; Kettenis, M. M.; Kim, Junhan; Kim, Jongsoo; Kim, Jae-Young; Kino, M.; Koay, Jun Yi; Koch, Patrick M.; Koyama, Shoko; Kramer, M.; Kramer, C.; Krichbaum, T.P.; Kuo, Cheng Yu; Lauer, Tod R.; Lee, Sang Sung; Li, Yan Rong; Li, Zhiyuan; Lindqvist, Micha ...; Lico, R.; Liu, Kuo; Liuzzo, Elisabet ...; Lo, Wen-Ping; Lobanov, A. P.; Loinard, L.; Lonsdale, Colin; Lu, R.S.; Macdonald, N. R.; Mao, Jirong; Markoff, S.; Marrone, D. P.; Marscher, A.; Marti-Vidal, Iva ...; Matsushita, S.; Matthews, L.D.; Medeiros, Lia; Menten, K.; Mizuno, Yosuke; Mizuno, Izumi; Moran, James M.; Moriyama, Kotaro; Mościbrodzka, M.; Müller, C.; Nagai, H.; Nagar, N. M.; Nakamura, Masano ...; Narayan, Ramesh; Narayanan, Gopal; Neri, R.; Ni, Chunchong; Noutsos, A.; Okino, Hiroki; Ortiz-León, G.N.; Oyama, Tomoaki; Özel, Feryal; Palumbo, Daniel ...; Patel, N.; Pen, U. L.; Pesce, Dominic W ...; Piétu, Vincent; Plambeck, Richar ...; PopStefanija, Al ...; Prather, Ben; Preciado-López, ...; Psaltis, D.; Pu, Hung-Yi; Ramakrishnan, Ve ...; Rao, R.; Rawlings, M.G.; Raymond, Alexand ...; Rezzolla, Lucian ...; Ripperda, Bart; Rogers, A.; Ros, Eduardo; Rose, Mel; Roshanineshat, A ...; Rottmann, H.; Roy, A.; Ruszczyk, C.; Ryan, Benjamin R ...; Rygl, Kazi L.J.; Sanchez, S.; Sánchez-Arguelle ...; Sasada, Mahito; Savolainen, T.; Schloerb, F. P.; Schuster, K.; Shao, Lijing; Shen, Zhi Qiang; Small, Des; Won Sohn, B.; SooHoo, J.; Tazaki, Fumie; Tiede, Paul; Titus, M.; Toma, Kenji; Torne, Pablo; Traianou, E.; Trent, Tyler; Trippe, S.; Tsuda, Shuichiro; van Langevelde, ...; van Rossum, Dani ...; Wagner, Jan; Wardle, John; Weintroub, J.; Wex, Norbert; Wharton, Robert; Wielgus, M.; Wong, George N.; Wu, Qingwen; Young, André; Young, K.; Younsi, Ziri; Yuan, Feng; Yuan, Ye-Fei; Zensus, A.J.; Zhao, G. Y.; Zhao, Shan-Shan; Zhu, Ziyan; visa färre...

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Astronomi astrof ...

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Geofysik

NATURVETENSKAP: NATURVETENSKAP; och Data och informa ...; och Datorseende och ...

Artiklar i publikationen: Astronomy and As ...

Av lärosätet: Chalmers tekniska högskola

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