Some magnetic and electric monopole one-body solutions of the Maxwell-Einstein equations

We examine the electromagnetic structure of a one-body solution of the coupled Einstein-Maxwell equations endowed with mass $m$, charge $Q$, specific angular momentum $a$, and a parameter $l$. It is shown how the parameter $l$ introduced by Newman, Tamburino, and Unti is related to the magnetic monopole charge distribution of the solution. A relation is presented between the total mass energy of the system and its irreducible mass. The total mass energy can be much smaller than the irreducible mass. A general solution characterized by the four parameters $m$, $Q$, $a$, and $l$ is here introduced.