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First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
The Event Horizon Telescope Collaboration
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A), the Galactic center source associated with a supermassive black hole. These observati…
Spectral Energy Distributions of Southern Binary X-Ray Sources
John M. Dickey, S. D. Vrtilek, Michael McCollough +5
The rapid variability of X-ray binaries produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to stu…
Compact radio emission indicates a structured jet was produced by a binary neutron star merger
G. Ghirlanda, O. S. Salafia, Z. Paragi +33
The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a…
The 1.4 mm core of Centaurus A: First VLBI results with the South Pole Telescope
Junhan Kim, Daniel P. Marrone, Alan L. Roy +27
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-da…
TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources
C. Müller, M. Kadler, R. Ojha +31
TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging,…
Towards the origin of the radio emission in AR Sco, the first radio-pulsing white dwarf binary
B. Marcote, T. R. Marsh, E. R. Stanway +2
The binary system AR Sco contains an M star and the only known radio-pulsing white dwarf. The system shows emission from radio to X-rays, likely dominated by synchrotron radiation.…