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The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines

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TLDR
In this article, the structure of the M87 jet from milliarcsecond to arcsecond scales is extensively investigated, utilizing the images taken with the European VLBI Network, MERLIN, and Very Long Baseline Array.
Abstract
The structure of the M87 jet, from milliarcsecond to arcsecond scales, is extensively investigated, utilizing the images taken with the European VLBI Network, MERLIN, and Very Long Baseline Array. We discover that the jet maintains a parabolic streamline over a range in size scale equal to 105 times the Schwarzschild radius. The jet then transitions into a conical shape farther downstream. This suggests that the magnetohydrodynamic jet is initially subjected to the confinement by the external gas which is dominated by the gravitational influence of the supermassive black hole. Afterward the jet then freely expands with a conical shape. This geometrical transition indicates that the origin of the HST-1 complex may be a consequence of the overcollimation of the jet. Our result suggests that when even higher angular resolution is provided by a future submillimeter very long baseline interferometry experiments, we will be able to explore the origin of active galactic nucleus jets.

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Journal ArticleDOI

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

Kazunori Akiyama, +406 more
TL;DR: In this article, the Event Horizon Telescope was used to reconstruct event-horizon-scale images of the supermassive black hole candidate in the center of the giant elliptical galaxy M87.
Journal ArticleDOI

First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole

Kazunori Akiyama, +254 more
TL;DR: In this article, the authors present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign, and find that >50% of the total flux at arcsecond scales comes from near the horizon and that the emission is dramatically suppressed interior to this region by a factor >10, providing direct evidence of the predicted shadow of a black hole.
Journal ArticleDOI

First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

Kazunori Akiyama, +254 more
TL;DR: In this article, the first Event Horizon Telescope (EHT) images of M87 were presented, using observations from April 2017 at 1.3 mm wavelength, showing a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole.
Journal ArticleDOI

First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring

Kazunori Akiyama, +262 more
TL;DR: In this article, a large library of models based on general relativistic magnetohydrodynamic (GRMHD) simulations and synthetic images produced by GRS was constructed and compared with the observed visibilities.
References
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Journal ArticleDOI

General relativistic magnetohydrodynamic simulations of the jet formation and large-scale propagation from black hole accretion systems

TL;DR: In this article, the formation and large-scale propagation of Poynting-dominated jets produced by accreting, rapidly rotating black hole systems are studied by numerically integrating the general relativistic magnetohydrodynamic equations of motion to follow the self-consistent interaction between accretion discs and black holes.
Journal ArticleDOI

The relation between accretion rate and jet power in X-ray luminous elliptical galaxies

TL;DR: In this article, the authors used Chandra X-ray observations of nine nearby, Xray luminous elliptical galaxies with good optical velocity dispersion measurements to show that a tight correlation exists between the Bondi accretion rates calculated from the observed gas temperature and density profiles and estimated black hole masses, and the power emerging from these systems in relativistic jets.
Journal ArticleDOI

The feedback-regulated growth of black holes and bulges through gas accretion and starbursts in cluster central dominant galaxies

TL;DR: In this article, the authors examined the relationship between cooling and star formation and found that the star formation rates are approaching or are comparable to X-ray and far-UV limits on the rates of gas condensation onto the central galaxy.
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