# Orbital motion near Sagittarius A*

@article{Wielgus2022OrbitalMN,
title={Orbital motion near Sagittarius A*},
author={Maciek Wielgus and Monika A. Mościbrodzka and Jesse Vos and Zachary Gelles and Iv{\'a}n Mart{\'i}-Vidal and Joseph R. Farah and Nicola Marchili and Ciriaco Goddi and Hugo Messias},
journal={Astronomy \&amp; Astrophysics},
year={2022}
}
• Published 1 September 2022
• Physics
• Astronomy &amp; Astrophysics
We report on the polarized light curves of the Galactic Center supermassive black hole Sagittarius A*, obtained at millimeter wavelength with the Atacama Large Millimeter/submillimeter Array (ALMA). The observations took place as a part of the Event Horizon Telescope campaign. We compare the observations taken during the low variability source state on 2017 Apr. 6 and 7 with those taken immediately after the X-ray flare on 2017 Apr. 11. For the latter case, we observe rotation of the electric…
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## References

SHOWING 1-10 OF 57 REFERENCES

• Physics
Astronomy & Astrophysics
• 2020
We study the time-variable linear polarisation of Sgr A* during a bright near-infrared flare observed with the GRAVITY instrument on July 28, 2018. Motivated by the time evolution of both the
• Physics
The Astrophysical Journal Letters
• 2022
The Event Horizon Telescope (EHT) observed the compact radio source, Sagittarius A* (Sgr A*), in the Galactic Center on 2017 April 5–11 in the 1.3 mm wavelength band. At the same time,
• Physics
• 2006
Context. We report new polarization measurements of the variable near-infrared emission of the SgrA* counterpart associated with the massive 3–$4\times10^6$ $M_{\odot}$ Black Hole at the Galactic
• Physics
The Astrophysical Journal Letters
• 2022
In this paper we provide a first physical interpretation for the Event Horizon Telescope's (EHT) 2017 observations of Sgr A*. Our main approach is to compare resolved EHT data at 230 GHz and
• Physics
The Astrophysical Journal Letters
• 2022
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 observations were conducted in
• Physics
Astronomy & Astrophysics
• 2018
We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states (“flares”) of its variable near-infrared emission with the near-infrared
• Physics
The Astrophysical Journal Letters
• 2021
Event Horizon Telescope (EHT) observations at 230 GHz have now imaged polarized emission around the supermassive black hole in M87 on event-horizon scales. This polarized synchrotron radiation probes
• Physics
The Astrophysical Journal Letters
• 2021
In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a
• Physics, Geology
Astronomy & Astrophysics
• 2020
Infrared observations of Sgr A* probe the region close to the event horizon of the black hole at the Galactic center. These observations can constrain the properties of low-luminosity accretion as
• Physics
• 2020
The Galactic Center black hole Sgr A* shows significant variability and flares in the submillimeter, infrared, and X-ray wavelengths. Owing to its exquisite resolution in the IR bands, the GRAVITY