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32 papers · 1 filter
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…
Polarization Measurements of Arecibo-Sky Pulsars: Faraday Rotations and Emission-Beam Analyses
Joanna Rankin, Arun Venkataraman, Joel M. Weisberg +1
We present Faraday Rotation Measure (RM) values derived at L- and P-band as well as some 60 Stokes-parameter profiles, both determined from our longstanding Arecibo dual-frequency…
A ring-like accretion structure in M87 connecting its black hole and jet
Ru-Sen Lu, Keiichi Asada, Thomas P. Krichbaum +118
The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation^{1,2}. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3…
Radio Pulsar Emission-Beam Geometry at Low Frequency: LOFAR High Band Survey Sources Studied using Arecibo at 1.4 GHz and 327 MHz
Haley Wahl, Joanna Rankin, Arun Venkataraman +1
This paper continues our study of radio pulsar emission-beam configurations with the primary intent of extending study to the lowest possible frequencies. Here we focus on a group…
Arecibo Pulsar Beam Geometry at Lower Frequencies Radio Pulsar Beam Geometry Down to the 100-MHz Band: 76 Additional Sources Within the Arecibo Sky
Joanna Rankin, Haley Wahl, Arun Venkataraman +1
This paper provides analyses of the emission beam structure of 76 ``B''-named pulsars within the Arecibo sky. Most of these objects are included in both the Gould & Lyne and LOFAR…
Pulsar radio emission mechanism II. On the origin of relativistic Langmuir solitons in pulsar plasma
Sk. Minhajur Rahaman, Dipanjan Mitra, George I. Melikidze +1
Observations suggest that coherent radio emission from pulsars is excited in a dense pulsar plasma by curvature radiation from charge bunches. Numerous studies propose that these c…