M87 black hole mass and spin estimate through the position of the jet boundary shape break. (arXiv:1904.05665v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Nokhrina_E/0/1/0/all/0/1">E.E. Nokhrina</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gurvits_L/0/1/0/all/0/1">L.I. Gurvits</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beskin_V/0/1/0/all/0/1">V.S. Beskin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nakamura_M/0/1/0/all/0/1">M. Nakamura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Asada_K/0/1/0/all/0/1">K. Asada</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hada_K/0/1/0/all/0/1">K. Hada</a>
We propose a new method of estimating a mass of a super massive black hole
residing in the center of an active galaxy. The active galaxy M87 offers a
convenient test case for the method due to the existence of a large amount of
observational data on the jet and ambient environment properties in the central
area of the object. We suggest that the observed transition of a jet boundary
shape from a parabolic to a conical form is associated with the flow transiting
from the magnetically dominated regime to the energy equipartition between
plasma bulk motion and magnetic field. By coupling the unique set of
observations available for the jet kinematics, environment and boundary profile
with our MHD modelling under assumption on the presence of a dynamically
important magnetic field in the M87 jet, we estimate the central black hole
mass and spin. The method leads us to believe that the M87 super massive black
hole has a mass somewhat larger than typically accepted so far.
We propose a new method of estimating a mass of a super massive black hole
residing in the center of an active galaxy. The active galaxy M87 offers a
convenient test case for the method due to the existence of a large amount of
observational data on the jet and ambient environment properties in the central
area of the object. We suggest that the observed transition of a jet boundary
shape from a parabolic to a conical form is associated with the flow transiting
from the magnetically dominated regime to the energy equipartition between
plasma bulk motion and magnetic field. By coupling the unique set of
observations available for the jet kinematics, environment and boundary profile
with our MHD modelling under assumption on the presence of a dynamically
important magnetic field in the M87 jet, we estimate the central black hole
mass and spin. The method leads us to believe that the M87 super massive black
hole has a mass somewhat larger than typically accepted so far.
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