Sagittarius a* - Open Access .click

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The Size, Shape, and Scattering of Sagittarius A* at 86 GHz: First VLBI with ALMA [PDF]

Astrophysical Journal, 2019
The Galactic center supermassive black hole Sagittarius A* (Sgr A*) is one of the most promising targets to study the dynamics of black hole accretion and outflow via direct imaging with very long baseline interferometry (VLBI).
S. Issaoun +51 more
semanticscholar +1 more source

Simulations of imaging the event horizon of Sagittarius A* from space [PDF]

Astronomy & Astrophysics, 2019
Context. It has been proposed that Very Long Baseline Interferometry (VLBI) at submillimeter waves will allow us to image the shadow of the black hole in the center of our Milky Way, Sagittarius A* (Sgr A*), and thereby test basic predictions of the ...
F. Roelofs +10 more
semanticscholar +1 more source

El género de milpiés Cylindroiulus Verhoeff, 1894 (Diplopoda: Julida; Julidae) en España: citas recientes y descripción de tres nuevas especies del País Vasco, Navarra, Andalucía y Cataluña

Graellsia, 2022
Se han examinado dos cuantiosas colecciones de Cylindroiulus (una del País Vasco y Navarra y otra de Andalucía), y se han suplementado con otras, más pequeñas, de otras áreas de España; en total se han encontrado 10 especies. Se han descrito tres nuevas
Helen J. Read
doaj +1 more source

General relativistic MHD simulations of non-thermal flaring in Sagittarius A* [PDF]

Monthly notices of the Royal Astronomical Society, 2020
Sgr A* exhibits regular variability in its multiwavelength emission, including daily X-ray flares and roughly continuous near-infrared (NIR) flickering.
K. Chatterjee +12 more
semanticscholar +1 more source

Distribution and Kinematics of Classical Cepheids in the Galactic Outer Ring

Open Astronomy, 2015
The existence of an outer ring in the Galaxy can explain the kinematics of OB associations in the Perseus and Sagittarius stellar-gas complexes. Moreover, it can also explain the orientation of the Carina arm with respect to the major axis of the bar. We
Mel’nik A. M. +4 more
doaj +1 more source

The Parallax and 3D Kinematics of Water Masers in the Massive Star-forming Region G034.43+0.24

The Astrophysical Journal, 2023
We report a measurement of the trigonometric parallax of 22 GHz water masers in the massive star-forming region G034.43+0.24 as part of the Bar and Spiral Structure Legacy Survey using the Very Long Baseline Array.
Xiaofeng Mai +14 more
doaj +1 more source

The Scattering and Intrinsic Structure of Sagittarius A* at Radio Wavelengths [PDF]

Astrophysical Journal, 2018
Radio images of the Galactic Center supermassive black hole, Sagittarius A* (Sgr A*), are dominated by interstellar scattering. Previous studies of Sgr A* have adopted an anisotropic Gaussian model for both the intrinsic source and the scattering, and ...
Michael D. Johnson +14 more
semanticscholar +1 more source

Detection of faint stars near Sagittarius A* with GRAVITY [PDF]

Astronomy & Astrophysics, 2020
The spin of the supermassive black hole that resides at the Galactic Center can, in principle, be measured by accurate measurements of the orbits of stars that are much closer to Sgr A* than S2, the orbit of which recently provided the measurement of the
G. Collaboration +60 more
semanticscholar +1 more source

Observing—and Imaging—Active Galactic Nuclei with the Event Horizon Telescope

Galaxies, 2016
Originally developed to image the shadow region of the central black hole in Sagittarius A* and in the nearby galaxy M87, the Event Horizon Telescope (EHT) provides deep, very high angular resolution data on other active galactic nucleus (AGN) sources ...
Vincent L. Fish +9 more
doaj +1 more source

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

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
semanticscholar +1 more source

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