• Publications
  • Influence
Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
The cores of most galaxies are thought to harbour supermassive black holes, which power galactic nuclei by converting the gravitational energy of accreting matter into radiation. Sagittarius A* (SgrExpand
  • 525
  • 65
  • PDF
Jet-Launching Structure Resolved Near the Supermassive Black Hole in M87
Black Hole Close-Up M87 is a giant elliptical galaxy about 55 million light-years away. Accretion of matter onto its central massive black hole is thought to power its relativistic jet. To probeExpand
  • 285
  • 47
  • PDF
1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-variable Emission on Event Horizon Scales
Sagittarius A*, the ~4 × 10^6 M_⊙ black hole candidate at the Galactic center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength very long baseline interferometry (VLBI).Expand
  • 147
  • 17
  • PDF
Imaging an Event Horizon: submm-VLBI of a Super Massive Black Hole
A long standing goal in astrophysics is to directly observe the immediate environment of a black hole with angular resolution comparable to the event horizon. Realizing this goal would open a newExpand
  • 92
  • 9
  • PDF
Resolved magnetic-field structure and variability near the event horizon of Sagittarius A*
Magnetic fields near the event horizon Astronomers have long sought to examine a black hole's event horizon—the boundary around the black hole within which nothing can escape. Johnson et al. usedExpand
  • 130
  • 7
  • PDF
Submillimeter Array Imaging of the Maser Emission from the H30α Radio Recombination Line in MWC 349A
We used the Submillimeter Array to map the angular distribution of the H30? recombination line (231.9 GHz) in the circumstellar region of the peculiar star MWC 349A. The resolution was 1.2 -->'', butExpand
  • 24
  • 5
  • PDF
Determining the neutrino mass with cyclotron radiation emission spectroscopy-Project 8
The most sensitive direct method to establish the absolute neutrino mass is observation of the endpoint of the tritium beta-decay spectrum. Cyclotron radiation emission spectroscopy (CRES) is aExpand
  • 62
  • 4
  • PDF
Detection of Intrinsic Source Structure at ~3 Schwarzschild Radii with Millimeter-VLBI Observations of SAGITTARIUS A*
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 inExpand
  • 40
  • 4
  • PDF
We report results from five day very long baseline interferometry observations of the well-known quasar 3C 279 at 1.3 mm (230 GHz) in 2011. The measured nonzero closure phases on triangles includingExpand
  • 32
  • 3
  • PDF
SWARM: A 32 GHz Correlator and VLBI Beamformer for the Submillimeter Array
A 32GHz bandwidth VLBI capable correlator and phased array has been designed and deployedaaAt the time of writing three of four identical SWARM quadrants have been deployed supporting 24 GHz bandwidth. Expand
  • 21
  • 3
  • PDF