Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
First M87 Event Horizon Telescope Results. III. Data Processing and Calibration. / Event Horizon Telescope Collaborat ; Эрштадт, Светлана Георгиевна.
в: Astrophysical Journal Letters, Том 875, № 1, L3, 10.04.2019.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
AU - Event Horizon Telescope Collaborat
AU - Akiyama, Kazunori
AU - Alberdi, Antxon
AU - Alef, Walter
AU - Asada, Keiichi
AU - Azulay, Rebecca
AU - Baczko, Anne-Kathrin
AU - Ball, David
AU - Balokovic, Mislav
AU - Barrett, John
AU - Bintley, Dan
AU - Blackburn, Lindy
AU - Boland, Wilfred
AU - Bouman, Katherine L.
AU - Bower, Geoffrey C.
AU - Bremer, Michael
AU - Brinkerink, Christiaan D.
AU - Brissenden, Roger
AU - Britzen, Silke
AU - Broderick, Avery E.
AU - Broguiere, Dominique
AU - Bronzwaer, Thomas
AU - Byun, Do-Young
AU - Carlstrom, John E.
AU - Chael, Andrew
AU - Chan, Chi-kwan
AU - Chatterjee, Shami
AU - Chatterjee, Koushik
AU - Chen, Ming-Tang
AU - Chen, Yongjun
AU - Cho, Ilje
AU - Christian, Pierre
AU - Conway, John E.
AU - Cordes, James M.
AU - Crew, Geoffrey B.
AU - Cui, Yuzhu
AU - Davelaar, Jordy
AU - De Laurentis, Mariafelicia
AU - Deane, Roger
AU - Dempsey, Jessica
AU - Desvignes, Gregory
AU - Dexter, Jason
AU - Doeleman, Sheperd S.
AU - Eatough, Ralph P.
AU - Falcke, Heino
AU - Fish, Vincent L.
AU - Fomalont, Ed
AU - Fraga-Encinas, Raquel
AU - Friberg, Per
AU - Fromm, Christian M.
AU - Gomez, Jose L.
AU - Эрштадт, Светлана Георгиевна
PY - 2019/4/10
Y1 - 2019/4/10
N2 - 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.
AB - 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.
KW - black hole physics
KW - galaxies: individual (M87, 3C279)
KW - galaxies: jets
KW - techniques: high angular resolution
KW - techniques: interferometric
KW - SUPERMASSIVE BLACK-HOLE
KW - MILLIMETER
KW - EFFICIENT
UR - http://www.scopus.com/inward/record.url?scp=85064448206&partnerID=8YFLogxK
UR - http://stacks.iop.org/2041-8205/875/i=1/a=L3?key=crossref.4bc7c8d9162e227c42bd2377945bd0ed
UR - http://www.mendeley.com/research/first-m87-event-horizon-telescope-results-iii-data-processing-calibration
U2 - 10.3847/2041-8213/ab0c57
DO - 10.3847/2041-8213/ab0c57
M3 - статья
VL - 875
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L3
ER -
ID: 41193203