Results 21 to 30 of about 35,587 (387)
Magnetic reconnection plasmoid model for Sagittarius A* flares [PDF]
Astronomy & Astrophysics, 2023 Sagittarius A*, the supermassive black hole at the center of our galaxy, exhibits episodic near-infrared flares. The recent monitoring of three such events by the GRAVITY instrument has shown that some flares are associated with orbital motions in the ...
N. Aimar +6 more
semanticscholar +1 more source
Millimeter Light Curves of Sagittarius A* Observed during the 2017 Event Horizon Telescope Campaign [PDF]
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.
M. Wielgus +266 more
semanticscholar +1 more source
The internal Faraday screen of Sagittarius A* [PDF]
Astronomy & Astrophysics, 2023 We report on 85-101\,GHz light curves of the Galactic Center supermassive black hole, Sagittarius A* ( observed in April 2017 with the Atacama Large Millimeter/submillimeter Array (ALMA).
M. Wielgus +7 more
semanticscholar +1 more source
Orbital motion near Sagittarius A* [PDF]
Astronomy & Astrophysics, 2022 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).
M. Wielgus +8 more
semanticscholar +1 more source
Probing Lorentz symmetry violation using the first image of Sagittarius A*: Constraints on standard-model extension coefficients [PDF]
Physical Review D, 2022 Thanks to unparalleled near-horizon images of the shadows of Messier 87* (M87*) and Sagittarius A* (Sgr A*) delivered by the Event Horizon Telescope (EHT), two amazing windows opened up to us for the strong-field test of the gravity theories as well as ...
Mohsen Khodadi, Gaetano Lambiase
semanticscholar +1 more source
Testing black hole mimickers with the Event Horizon Telescope image of Sagittarius A* [PDF]
Monthly notices of the Royal Astronomical Society, 2022 The Event Horizon Telescope (EHT) has recently observed the image and shadow of the supermassive compact object Sagittarius A* (Sgr A*). According to the EHT collaboration, the observed image is consistent with the expected appearance of a Kerr black ...
R. Shaikh
semanticscholar +1 more source
Prospects for constraining the Yukawa gravity with pulsars around Sagittarius A* [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 The discovery of radio pulsars (PSRs) around the supermassive black hole (SMBH) in our Galactic Center (GC), Sagittarius A* (Sgr A*), will have significant implications for tests of gravity. In this paper, we predict restrictions on the parameters of the
Yiming Dong +4 more
semanticscholar +1 more source
Multiwavelength Variability of Sagittarius A* in 2019 July [PDF]
Astrophysical Journal, 2022 We report a timing analysis of near-infrared (NIR), X-ray, and submillimeter data during a 3 day coordinated campaign observing Sagittarius A*. Data were collected at 4.5 μm with the Spitzer Space Telescope, 2–8 keV with the Chandra X-ray Observatory, 3 ...
H. Boyce +16 more
semanticscholar +1 more source
Precession of the Sagittarius stream [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 Using a variety of stellar tracers -- blue horizontal branch stars, main-sequence turn-off stars and red giants -- we follow the path of the Sagittarius (Sgr) stream across the sky in Sloan Digital Sky Survey data. Our study presents new Sgr debris detections, accurate distances and line-of-sight velocities that together help to shed new light on the ...
Belokurov, V +11 more
openaire +3 more sources
Persistent Non-Gaussian Structure in the Image of Sagittarius A* at 86 GHz [PDF]
Astrophysical Journal, 2021 Observations of the Galactic Center supermassive black hole Sagittarius A* (Sgr A*) with very long-baseline interferometry (VLBI) are affected by interstellar scattering along our line of sight. At long radio observing wavelengths (≲1 cm), the scattering
S. Issaoun +28 more
semanticscholar +1 more source