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Deformed black hole in Sagittarius A [PDF]

Physical Review D, 2021
We analyze the post-Newtonian orbit of stars around a deformed Kerr black hole. The deformation we consider is a class of disformal transformations of a nontrivial Kerr solution in scalar-tensor theory which are labeled via the disformal parameter $D$. We study different limits of the disformal parameter, and compare the trajectories of stars orbiting ...
T. Anson, E. Babichev, C. Charmousis
openaire +6 more sources

The last breath of the Sagittarius dSph [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACTWe use the astrometric and photometric data from Gaia Data Release 2 and line-of-sight velocities from various other surveys to study the 3D structure and kinematics of the Sagittarius dwarf galaxy. The combination of photometric and astrometric data makes it possible to obtain a very clean separation of Sgr member stars from the Milky Way ...
Eugene Vasiliev, Eugene Vasiliev, Vasily Belokurov +2 more
openaire +4 more sources

First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring

The Astrophysical Journal Letters
The Event Horizon Telescope observed the horizon-scale synchrotron emission region around the Galactic center supermassive black hole, Sagittarius A* (Sgr A*), in 2017. These observations revealed a bright, thick ring morphology with a diameter of 51.8 ±
The Event Horizon Telescope Collaboration +285 more
doaj +2 more sources

First Sagittarius A* Event Horizon Telescope Results. VIII. Physical Interpretation of the Polarized Ring

The Astrophysical Journal Letters
In a companion paper, we present the first spatially resolved polarized image of Sagittarius A* on event horizon scales, captured using the Event Horizon Telescope, a global very long baseline interferometric array operating at a wavelength of 1.3 mm ...
The Event Horizon Telescope Collaboration +286 more
doaj +2 more sources

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗ [PDF]

Classical and quantum gravity, 2022
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime.
S. Vagnozzi +3 more
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way [PDF]

, 2023
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A$^*$), the Galactic center source associated with a supermassive black hole.
K. Akiyama +387 more
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration [PDF]

, 2023
We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A* (Sgr A*), collected during the 2017 April 5--11 campaign.
The Event Horizon Telescope Collaboration
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole [PDF]

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 unresolved non-EHT observations from radio to X-ray ...
K. Akiyama +273 more
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass [PDF]

Astrophysical Journal Letters, 2022
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
Event Horizon Telescope Collaboration +269 more
semanticscholar +1 more source

First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole [PDF]

Astrophysical Journal Letters, 2022
We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm.
Event Horizon Telescope Collaboration +270 more
semanticscholar +1 more source

milky way
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interacting galaxy
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