17 research outputs found
Meat in nutrition: XV. Certain characteristics of gestational performance in albino rats fed a diet containing dried autoclaved pork muscle
Self-Dual Black Holes in Celestial Holography
We construct two-dimensional quantum states associated to four-dimensional
linearized rotating self-dual black holes in signature Klein space. The
states are comprised of global conformal primaries circulating on the celestial
torus, the Kleinian analog of the celestial sphere. By introducing a
generalized tower of Goldstone operators we identify the states as coherent
exponentiations carrying an infinite tower of charges or
soft hair. We relate our results to recent approaches to black hole scattering,
including a connection to Wilson lines, -matrix results, and
celestial holography in curved backgrounds.Comment: 20 pages + 3 appendice
The Polarized Image of a Synchrotron-emitting Ring of Gas Orbiting a Black Hole
Abstract: Synchrotron radiation from hot gas near a black hole results in a polarized image. The image polarization is determined by effects including the orientation of the magnetic field in the emitting region, relativistic motion of the gas, strong gravitational lensing by the black hole, and parallel transport in the curved spacetime. We explore these effects using a simple model of an axisymmetric, equatorial accretion disk around a Schwarzschild black hole. By using an approximate expression for the null geodesics derived by Beloborodov and conservation of the Walker–Penrose constant, we provide analytic estimates for the image polarization. We test this model using currently favored general relativistic magnetohydrodynamic simulations of M87*, using ring parameters given by the simulations. For a subset of these with modest Faraday effects, we show that the ring model broadly reproduces the polarimetric image morphology. Our model also predicts the polarization evolution for compact flaring regions, such as those observed from Sgr A* with GRAVITY. With suitably chosen parameters, our simple model can reproduce the EVPA pattern and relative polarized intensity in Event Horizon Telescope images of M87*. Under the physically motivated assumption that the magnetic field trails the fluid velocity, this comparison is consistent with the clockwise rotation inferred from total intensity images
The polarized image of a synchrotron-emitting ring of gas orbiting a black hole
Synchrotron radiation from hot gas near a black hole results in a polarized image. The image polarization is
determined by effects including the orientation of the magnetic field in the emitting region, relativistic motion of
the gas, strong gravitational lensing by the black hole, and parallel transport in the curved spacetime. We explore
these effects using a simple model of an axisymmetric, equatorial accretion disk around a Schwarzschild black
hole. By using an approximate expression for the null geodesics derived by Beloborodov and conservation of the
Walker–Penrose constant, we provide analytic estimates for the image polarization. We test this model using
currently favored general relativistic magnetohydrodynamic simulations of M87*, using ring parameters given by
the simulations. For a subset of these with modest Faraday effects, we show that the ring model broadly reproduces
the polarimetric image morphology. Our model also predicts the polarization evolution for compact flaring regions,
such as those observed from Sgr A* with GRAVITY. With suitably chosen parameters, our simple model can
reproduce the EVPA pattern and relative polarized intensity in Event Horizon Telescope images of M87*. Under
the physically motivated assumption that the magnetic field trails the fluid velocity, this comparison is consistent
with the clockwise rotation inferred from total intensity images.http://iopscience.iop.org/0004-637Xam2023Physic
Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
Abstract: Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimetre wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to 10–100 gravitational radii (rg ≡ GM/c2) scales in nearby sources1. Centaurus A is the closest radio-loud source to Earth2. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our Galactic Centre. A large southern declination of −43° has, however, prevented VLBI imaging of Centaurus A below a wavelength of 1 cm thus far. Here we show the millimetre VLBI image of the source, which we obtained with the Event Horizon Telescope at 228 GHz. Compared with previous observations3, we image the jet of Centaurus A at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. We reveal a highly collimated, asymmetrically edge-brightened jet as well as the fainter counterjet. We find that the source structure of Centaurus A resembles the jet in Messier 87 on ~500 rg scales remarkably well. Furthermore, we identify the location of Centaurus A’s SMBH with respect to its resolved jet core at a wavelength of 1.3 mm and conclude that the source’s event horizon shadow4 should be visible at terahertz frequencies. This location further supports the universal scale invariance of black holes over a wide range of masses5, 6