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S. Issaoun, M. D. Johnson, L. Blackburn, C.D. Brinkerink, M. Mościbrodzka, A. Chael, C. Goddi, I. Martí-Vidal, J. Wagner, S. S. Doeleman, H. Falcke, T. P. Krichbaum, K. Akiyama, U. Bach, K. L. Bouman, G. C. Bower, A. Broderick, I. Cho, G. Crew, J. Dexter, V. Fish, R. Gold, J. L. Gómez, K. Hada, A. Hernández-Gómez, M. Janßen, M. Kino, M. Kramer, L. Loinard, R.-S. Lu, S. Markoff, D. P. Marrone, L. D. Matthews, J. M. Moran, C. Müller, F. Roelofs, E. Ros, H. Rottmann, S. Sanchez, R. P. J. Tilanus, P. Vicente, M. Wielgus, J. A. Zensus, and G.-Y. Zhao. 2019. “The Size, Shape, and Scattering of Sagittarius A* at 86 GHz: First VLBI With ALMA”. ApJ
S. Issaoun, M. D. Johnson, L. Blackburn, C.D. Brinkerink, M. Mościbrodzka, A. Chael, C. Goddi, I. Martí-Vidal, J. Wagner, S. S. Doeleman, H. Falcke, T. P. Krichbaum, K. Akiyama, U. Bach, K. L. Bouman, G. C. Bower, A. Broderick, I. Cho, G. Crew, J. Dexter, V. Fish, R. Gold, J. L. Gómez, K. Hada, A. Hernández-Gómez, M. Janßen, M. Kino, M. Kramer, L. Loinard, R.-S. Lu, S. Markoff, D. P. Marrone, L. D. Matthews, J. M. Moran, C. Müller, F. Roelofs, E. Ros, H. Rottmann, S. Sanchez, R. P. J. Tilanus, P. Vicente, M. Wielgus, J. A. Zensus, and G.-Y. Zhao. 2019. “The Size, Shape, and Scattering of Sagittarius A* at 86 GHz: First VLBI With ALMA”. ApJ
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole”. ApJL, 875, L1, Pp. 1-17
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole”. ApJL, 875, L1, Pp. 1-17
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study this phenomenon, we have assembled the Event Horizon...
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. II. Array and Instrumentation”. ApJL, 875, L2, Pp. 1-28
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. II. Array and Instrumentation”. ApJL, 875, L2, Pp. 1-28
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comparable to the diameter of the Earth. At a nominal operating wavelength of...
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. III. Data Processing and Calibration”. ApJL, 875, L3, Pp. 1-32
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. III. Data Processing and Calibration”. ApJL, 875, L3, Pp. 1-32
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...
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole”. ApJL, 875, L4, Pp. 1-52
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole”. ApJL, 875, L4, Pp. 1-52
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 ~40 μas, consistent with the size and shape of the lensed photon orbit...
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring”. ApJL, 875, L5, Pp. 1-31
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring”. ApJL, 875, L5, Pp. 1-31
The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data. To...
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole”. ApJL, 875, L6, Pp. 1-44
The Event Horizon Telescope Collaboration. 2019. “First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole”. ApJL, 875, L6, Pp. 1-44
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using...
K. Bouman, M. D. Johnson, A. V. Dalca, A. A. Chael, F. Roelofs, S. S. Doeleman, and W. T. Freeman. 2018. “Reconstructing Video from Interferometric Measurements of Time - Varying Sources”. IEEE Transactions on Computational Imaging, 4, 512
K. Bouman, M. D. Johnson, A. V. Dalca, A. A. Chael, F. Roelofs, S. S. Doeleman, and W. T. Freeman. 2018. “Reconstructing Video from Interferometric Measurements of Time - Varying Sources”. IEEE Transactions on Computational Imaging, 4, 512
Very long baseline interferometry (VLBI) makes it possible to recover images of astronomical sources with extremely high angular resolution. Most recently, the Event Horizon Telescope (EHT) has extended VLBI to short millimeter wavelengths with a goal of...
L. Matthews, G. Crew, S. S. Doeleman, and al. 2018. “The ALMA Phasing System: A Beamforming Capability for Ultra-High-Resolution Science at (Sub)Millimeter Wavelengths”. PASP, 130, 015002
L. Matthews, G. Crew, S. S. Doeleman, and al. 2018. “The ALMA Phasing System: A Beamforming Capability for Ultra-High-Resolution Science at (Sub)Millimeter Wavelengths”. PASP, 130, 015002
The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware and software necessary to coherently sum the signals of individual ALMA antennas and record the aggregate sum in Very Long Baseline...
R.-S. Lu, T. P. Krichbaum, A. L. Roy, V. L. Fish, S. S. Doeleman, and al. 2018. “Detection of Intrinsic Source Structure at ~3 Schwarzschild Radii With Millimeter-VLBI Observations of Sagittarius A* ”. ApJ, 859, 60
R.-S. Lu, T. P. Krichbaum, A. L. Roy, V. L. Fish, S. S. Doeleman, and al. 2018. “Detection of Intrinsic Source Structure at ~3 Schwarzschild Radii With Millimeter-VLBI Observations of Sagittarius A* ”. ApJ, 859, 60
We report results from very long baseline interferometric (VLBI) observations of the supermassive black hole in the Galactic center, Sgr A*, at 1.3 mm (230 GHz). The observations were performed in 2013 March using six VLBI stations in Hawaii, California...
J. Kim and al. 2018. “The 1.4mm Core of Centaurus A: First VLBI Results from the South Pole Telescope”. ApJ, 861, 129
J. Kim and al. 2018. “The 1.4mm Core of Centaurus A: First VLBI Results from the South Pole Telescope”. ApJ, 861, 129
Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light-day. The South Pole Telescope (SPT) and the Atacama Pathfinder Experiment...
M.T. Chen and al. 2018. “The Greenland Telescope: Thule Operations”
M.T. Chen and al. 2018. “The Greenland Telescope: Thule Operations”
The Greenland Telescope Project (GLT) has successfully commissioned its 12-m sub-millimeter. In January 2018, the fringes were detected between the GLT and the Atacama Large Millimeter Array (ALMA) during a very-long-baseline interferometry (VLBI)...