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Modeling in-ice radio propagation with parabolic equation methods
S. Prohira, C. Sbrocco, P. Allison +24
We investigate the use of parabolic equation (PE) methods for solving radio-wave propagation in polar ice. PE methods provide an approximate solution to Maxwell's equations, in con…
Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
Dimitrios Psaltis, Lia Medeiros, Pierre Christian +185
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new…
The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
D. W. Pesce, J. A. Braatz, M. J. Reid +8
We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser dat…
The Megamaser Cosmology Project. XI. A geometric distance to CGCG 074-064
D. W. Pesce, J. A. Braatz, M. J. Reid +6
As part of the survey component of the Megamaser Cosmology Project, we have discovered a disk megamaser system in the galaxy CGCG 074-064. Using the GBT and the VLA, we have obtain…