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Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III
Alexander P. Ji, Ting S. Li, Joshua D. Simon +15
We present the first detailed elemental abundances in the ultra-faint Magellanic satellite galaxies Carina II (Car II) and Carina III (Car III). With high-resolution Magellan/MIKE…
The Shadow of a Spherically Accreting Black Hole
Ramesh Narayan, Michael D. Johnson, Charles F. Gammie
We explore a simple spherical model of optically thin accretion on a Schwarzschild black hole, and study the properties of the image as seen by a distant observer. We show that a d…
Detection of pulses from the Vela pulsar at millimeter wavelengths with phased ALMA
Kuo Liu, Andre Young, Robert Wharton +20
We report on the first detection of pulsed radio emission from a radio pulsar with the ALMA telescope. The detection was made in the Band-3 frequency range (85-101 GHz) using ALMA…
Closure statistics in interferometric data
Lindy Blackburn, Dominic W. Pesce, Michael D. Johnson +4
Interferometric visibilities, reflecting the complex correlations between signals recorded at antennas in an interferometric array, carry information about the angular structure of…
Extremely long baseline interferometry with Origins Space Telescope
Dominic W. Pesce, Kari Haworth, Gary J. Melnick +8
Operating 1.5 million km from Earth at the Sun-Earth L2 Lagrange point, the Origins Space Telescope equipped with a slightly modified version of its HERO heterodyne instrument coul…
Studying black holes on horizon scales with space-VLBI
Kari Haworth, Michael D. Johnson, Dominic W. Pesce +25
The Event Horizon Telescope (EHT) recently produced the first horizon-scale image of a supermassive black hole. Expanding the array to include a 3-meter space telescope operating a…
Studying Black Holes on Horizon Scales with VLBI Ground Arrays
Lindy Blackburn, Sheperd Doeleman, Jason Dexter +35
High-resolution imaging of supermassive black holes is now possible, with new applications to testing general relativity and horizon-scale accretion and relativistic jet formation…
Prospects for Wideband VLBI Correlation in the Cloud
Ajay Gill, Lindy Blackburn, Arash Roshanineshat +5
This paper proposes a cloud architecture for the correlation of wide bandwidth VLBI data. Cloud correlation facilitates processing of entire experiments in parallel using flexibly…
Universal Interferometric Signatures of a Black Hole's Photon Ring
Michael D. Johnson, Alexandru Lupsasca, Andrew Strominger +14
The Event Horizon Telescope image of the supermassive black hole in the galaxy M87 is dominated by a bright, unresolved ring. General relativity predicts that embedded within this…
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
The Event Horizon Telescope Collaboration
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric cres…
First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the phy…
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
The Event Horizon Telescope Collaboration
We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40…
First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
The Event Horizon Telescope Collaboration
We present the calibration and reduction of Event Horizon Telescope (EHT) 1.3mm radio wavelength observations of the supermassive black hole candidate at the center of the radio ga…
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comp…
Metrics and Motivations for Earth-Space VLBI: Time-Resolving Sgr A* with the Event Horizon Telescope
Daniel C. M. Palumbo, Sheperd S. Doeleman, Michael D. Johnson +2
Very-long-baseline interferometry (VLBI) at frequencies above 230 GHz with Earth-diameter baselines gives spatial resolution finer than the as "shadow" of the supermass…
The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
Oliver Porth, Koushik Chatterjee, Ramesh Narayan +25
Recent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope (…
EHT-HOPS pipeline for millimeter VLBI data reduction
Lindy Blackburn, Chi-kwan Chan, Geoffrey B. Crew +12
We present the design and implementation of an automated data calibration and reduction pipeline for very-long-baseline interferometric (VLBI) observations taken at millimeter wave…