A Jet Source of Event Horizon Telescope Correlated Flux in M87

Abstract

Event Horizon Telescope (EHT) observations at 230 GHz are combined with Very Long Baseline Interferometry (VLBI) observations at 86 GHz and high resolution Hubble Space Telescope optical observations in order to constrain the broadband spectrum of the emission from the base of the jet in M87. The recent VLBI observations of Hada et al provide much stricter limits on the 86 GHz luminosity and component acceleration in the jet base than was available to previous modelers. They reveal an almost hollow jet on sub-mas scales. Thus, tubular models of the jet base emanating from the innermost accretion disk are considered within the region responsible for the EHT correlated flux. There is substantial synchrotron self absorbed opacity at 86 GHz. A parametric analysis indicates that the jet dimensions and power depend strongly on the 86 GHz flux density and the black hole spin, but weakly on other parameters such as jet speed, 230 GHz flux density and optical flux. The entire power budget of the M87 jet, $\lesssim 10^{44}ergs/sec$, can be accommodated by the tubular jet. No invisible, powerful spine is required. Even though this analysis never employs the resolution of the EHT, the spectral shape implies a dimension transverse to the jet direction of 12-21 $\mu \mathrm{as}$ ($\sim$24-27$\mu \mathrm{as}$) for $0.99>a/M>0.95$ ($a/M\sim 0.7$), where $M$ is the mass and $a$ is the angular momentum per unit mass of the central black hole.

To appear in ApJ

References in corpus (11)

• Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
• Kinematics of the jet in M87 on scales of 100 -- 1000 Schwarzschild radii
• Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope using Sparse Modeling
• Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
• Dynamics and High Energy Emission of the Flaring HST-1 Knot in the M 87 Jet
• 230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy $\gamma$-ray state in 2012
• Electron Surfing and Drift Accelerations in a Weibel-dominated High-Mach-number Shock
• Magnetization degree at the jet base of M87 derived from the event horizon telescope data: Testing magnetically driven jet paradigm
• Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales
• A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
• Resolving the base of the relativistic jet in M87 at 6$R_{\mathrm{sch}}$ resolution with global mm-VLBI

Cited by in corpus (1)

• Constraints on Black Hole Jet Models Used As Diagnostic Tools of Event Horizon Telescope Observations of M87