259 citations · 1.8k across the 51 of their papers we have counts for
51 papers
An Electromagnetic Plane Wave in the Spacetime of a Plane Gravitational Wave
Carl R. Gwinn
I find nearly plane-wave solutions for the Gauss-Ampere law for the 4-vector potential, subject to the Lorenz gauge condition, in the spacetime of a plane gravitational plane wave.…
First Space-VLBI Observations of Sagittarius A*
Michael D. Johnson, Yuri Y. Kovalev, Mikhail M. Lisakov +3
We report results from the first Earth-space VLBI observations of the Galactic Center supermassive black hole, Sgr A*. These observations used the space telescope Spektr-R of the R…
Scintillation Arc Brightness and Electron Density for an Analytical Noodle Model
Carl R. Gwinn, Evan B. Sosenko
We show that narrow filaments or sheets of over- or under-dense plasma, or "noodles," with fluctuations of scattering phase of less than a radian, can form the scintillation arcs s…
Noodle Model for Scintillation Arcs
Carl R. Gwinn
I show that narrow, parallel strips of phase-changing material, or "noodles," generically produce parabolic structures in the delay-rate domain. Such structures are observed as "sc…
The Scattering and Intrinsic Structure of Sagittarius A* at Radio Wavelengths
Michael D. Johnson, Ramesh Narayan, Dimitrios Psaltis +12
Radio images of the Galactic Center supermassive black hole, Sagittarius A* (Sgr A*), are dominated by interstellar scattering. Previous studies of Sgr A* have adopted an anisotrop…
PSR B0329+54: Substructure in the scatter-broadened image discovered with RadioAstron on baselines up to 330,000 km
M. V. Popov, N. Bartel, C. R. Gwinn +13
We have resolved the scatter-broadened image of PSR B0329+54 and detected substructure within it. These results are not influenced by any extended structure of a source but instead…