The JetCurry Code. I. Reconstructing Three-Dimensional Jet Geometry from Two-Dimensional images

TL;DR

This paper introduces a numerical method combining MCMC and BFGS algorithms to reconstruct the three-dimensional geometry of AGN jets from two-dimensional images, aiding in understanding jet physics.

Contribution

It presents a novel approach for modeling 3D jet structures from 2D observations using advanced optimization techniques.

Findings

Successfully reconstructed the 3D geometry of the M87 jet region.

Demonstrated the method's effectiveness in capturing complex jet bends.

Provided insights into the intrinsic structure of AGN jets.

Abstract

We present a reconstruction of jet geometry models using numerical methods based on a Markov ChainMonte Carlo (MCMC) and limited memory Broyden-Fletcher-Goldfarb-Shanno (BFGS) optimized algorithm. Our aim is to model the three-dimensional geometry of an AGN jet using observations, which are inherently two-dimensional. Many AGN jets display complex hotspots and bends over the kiloparsec scales. The structure of these bends in the jets frame may be quite different than what we see in the sky frame, transformed by our particular viewing geometry. The knowledge of the intrinsic structure will be helpful in understanding the appearance of the magnetic field and hence emission and particle acceleration processes over the length of the jet. We present the method used, as well as a case study based on a region of the M87 jet.