Impact of non-thermal particles on the spectral and structural\n properties of M87

Abstract

The recent 230 GHz observations of the Event Horizon Telescope (EHT) are able\nto image the innermost structure of the M87 and show a ring-like structure\nwhich is in agreement with thermal synchrotron emission generated in a torus\nsurrounding a supermassive black hole. However, at lower frequencies M87 is\ncharacterised by a large-scale and edge-brightened jet with clear signatures of\nnon-thermal emission. In order to bridge the gap between these scales and to\nprovide a theoretical interpretation of these observations we perform general\nrelativistic magnetohydrodynamic simulations of accretion on to black holes and\njet launching.\n M87 has been the target for multiple observations across the entire\nelectromagnetic spectrum. Among these VLBI observations provide unique details\non the collimation profile of the jet down to several gravitational radii. In\nthis work we aim to model the observed broad-band spectrum of M87 from the\nradio to the NIR regime and at the same time fit the jet structure as observed\nwith Global mm-VLBI at 86 GHz. We use general relativistic magnetohydrodynamics\nand simulate the accretion of the magnetised plasma onto Kerr-black holes in\n3D. The radiative signatures of these simulations are computed taking different\nelectron distribution functions into account and a detailed parameter survey is\nperformed in order to match the observations.\n The results of our simulations show that magnetically arrested disks around\nfast spinning black holes ($a_\\star\\geq0.5$) together with a mixture of thermal\nand non-thermal particle distributions are able to model simultaneously the\nbroad-band spectrum and the innermost jet structure of M87\n