First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
Woodwell Climate Research Center · Harvard University · +129 more institutions
Indexed inarxivcrossrefdoaj
Abstract
Abstract In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. We find that the Sgr A* data exhibit variability that exceeds what can be explained by the uncertainties in the data or by the effects of interstellar scattering. The magnitude of this variability can be a substantial fraction of the correlated flux density, reaching ∼100% on some baselines. Through an exploration of simple geometric source models, we demonstrate that ring-like morphologies provide better fits to the Sgr A* data than do other morphologies with comparable complexity. We develop two strategies for fitting…
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Authors
269- KAKazunori Akiyama
- AAA. Alberdi
Woodwell Climate Research Center, Harvard University, National Astronomical Observatory of Japan, Massachusetts Institute of Technology
- WAW. Alef
Instituto de Astrofísica de Andalucía
- JCJuan Carlos Algaba
Max Planck Institute for Radio Astronomy
- RARichard Anantua
University of Malaya
Topics & keywords
Topics
Keywords
- Physics
- Sagittarius A*
- Astrophysics
- RADIUS
- Calibration
- Supermassive black hole
- Galaxy
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