PKS 2131-021 is quasar and a BL Lacerate object,[1] producing an astrophysical jet.[2] lt is located in the constellation Aquarius and classified as a blazar, a type of active galactic nucleus whose relativistic jet points in the direction towards Earth.
The redshift of PKS 2131-021 is 1.285, estimating the quasar to be located about 8.5 billion light-years away.[3] For more consistency according to researchers, they applied a cosmological parameters of H0 = 71 km s−1 Mpc−1, Ωm = 0.27, ΩΛ = 0.73.[4] On this model, the comoving coordinate distance of PKS 2131−021 is 3.97 Gpc, with an angular diameter distance of 1.74 Gpc, and luminosity distance of 9.08 Gpc.[5]
Observations of its radio emission spanning a 45-year duration show epochs of periodic brightness variations. These nearly sinusoidal brightness changes have been interpreted as evidence of orbital motion of a binary black hole.[5] The orbital separation of the two black holes is inferred to be 200 to 2000 AU.[6][7] The periodic variability in the light curve indicates that the pair orbit each other about every two years, at a distance so close that they will merge in about 10,000 years (as viewed from the Earth).[8]
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