15 research outputs found
New Black Hole Spin Values for Sagittarius A* Obtained with the Outflow Method
Six archival Chandra observations are matched with eight sets of radio data
and studied in the context of the outflow method to measure and study the spin
properties of . Three radio and X-ray data sets obtained
simultaneously, or partially simultaneously, are identified as preferred for
the purpose of measuring the spin properties of . Similar
results are obtained with other data sets. Results obtained with the preferred
data sets are combined and indicate a weighted mean value of the spin function
of and dimensionless spin angular momentum of
. The spin function translates into measurements of
the black hole rotational mass, , irreducible mass,
, and spin mass-energy available for extraction, ,
relative to the total black hole dynamical mass, . Weighted mean
values of , , ,
, , and are obtained; of course since . Values obtained for are compared with those obtained for M87 based on the published spin
function which indicate that M87 carries substantially more rotational energy
and spin mass-energy relative to the total (i.e., dynamical) black hole mass,
the irreducible black hole mass, and in absolute terms.Comment: Accepted for publication in MNRAS on October 16, 202