Results 211 to 220 of about 21,097,663 (248)
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.
Maciek Wielgus +2 more
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The role of electron heating physics in images and variability of the Galactic Centre black hole Sagittarius A* [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 The accretion flow around the Galactic Center black hole Sagittarius A* (Sgr A*) is expected to have an electron temperature that is distinct from the ion temperature, due to weak Coulomb coupling in the low-density plasma.
Andrew A Chael +2 more
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The surprisingly small impact of magnetic fields on the inner accretion flow of Sagittarius A* fueled by stellar winds [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 We study the flow structure in 3D magnetohydrodynamic (MHD) simulations of accretion onto Sagittarius A* via the magnetized winds of the orbiting Wolf-Rayet stars.
Eliot Quataert
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Constraints on horizonless objects after the EHT observation of Sagittarius A*
Journal of Cosmology and Astroparticle Physics, 2022The images of Sagittarius A* recently released by the Event Horizon Telescope collaboration have been accompanied [ Astrophys. J. Lett. 930 (2022) L17] by an analysis of the constraints on the possible absence of a trapping horizon, i.e.
R. Carballo-Rubio +3 more
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The impact of Faraday effects on polarized black hole images of Sagittarius A* [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 We study model images and polarization maps of Sagittarius A* at 230 GHz. We post-process GRMHD simulations and perform a fully relativistic radiative transfer calculation of the emitted synchrotron radiation to obtain polarized images for a range of ...
Alejandra Jiménez-Rosales, Jason Dexter
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Symposium - International Astronomical Union, 1967
The available high-resolution observations of the complex of radio sources in the region of the galactic centre are reviewed and analysed. As noted by Downes and Maxwell, the spectrum of the strong central source, Sagittarius A, is markedly non-thermal (index 0·7) at high frequencies; below 3000 MHz the spectrum may be flat, but flux values obtained at
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The available high-resolution observations of the complex of radio sources in the region of the galactic centre are reviewed and analysed. As noted by Downes and Maxwell, the spectrum of the strong central source, Sagittarius A, is markedly non-thermal (index 0·7) at high frequencies; below 3000 MHz the spectrum may be flat, but flux values obtained at
openaire +1 more source
NEAR-INFRARED OBSERVATIONS OF SAGITTARIUS A*
The Eleventh Marcel Grossmann Meeting, 2008Resumen en: We present and discuss recent near infrared observations of Sagittarius A, the supermassive black hole in the centre of our Galaxy.
Trippe, S. +6 more
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Sagittarius A* magnetism revealed
Physics WorldThe magnetic field of the Milky Way’s black hole is surprisingly similar to that of the black hole at the centre of the galaxy Messier 87, as Keith Cooper reports.
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A dwarf satellite galaxy in Sagittarius
Nature, 1994WE have detected a large, extended group of comoving stars in the direction of the Galactic Centre, which we interpret as belonging to a dwarf galaxy that is closer to our own Galaxy than any other yet known. Located in the constellation of Sagittarius, and on the far side of the Galactic Centre, it has not previously been seen because of the large ...
R. A. Ibata, G. Gilmore, M. J. Irwin
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Sagittarius A*, il grande sterilizzatore
2017Quanto può aver pregiudicato la possibilità dell’esistenza della vita l’intensa radiazione ionizzante emessa da Sgr A*, il buco nero supermassiccio nel cuore della Via Lattea, durante la sua fase attiva?
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