PKS 0208-512 is found to be strongly variable on the electromagnetic spectrum. it shows a significant correlation between its intensity and spectral index,[2] and is a source of gamma ray activity.[6][7][8] It is known to have had three powerful outbursts when observed at optical to near-infraredwavelengths.[9] Between September 11 and 30 in 2008, the quasar brightened upon showing a flare, with increased magnitudes in both B-band and R-band.[10] In the gamma ray lightcurve, it showed a variable flux reaching a factor of 6 on timescales of weeks.[11]
A major gamma ray flare was detected in PKS 0208-512 between November 2019 and May 2020.[12][13]Fermi-LAT observations proposed that its daily average gamma ray flux at > 100 MeV amplified to 1.1 ± 0.2 x 10−6 ph cm−2 s−1 on November 29, 2019, and subsequently to 2.0 ± 0.3 x 10−6 ph cm−2 s−1 by March 15, 2020. During the activity, the gamma ray lightcurve exhibited multiple peaks indicating the presence of subflares.[13]
PKS 0208-512 has a complex radio structure.[14] It is made up of a compact radio core with a projected spectral flux density of 2.8 Jansky and a jet component located at a position angle of 234° from the core with an angular separation of 1.7 mas. Using 2.3 and 5.0 GHz results, the core has a spectral index of 0.15, as well as having an obtained brightness temperature of 1.9 x 1012 K.[4] There is also a long jet present at a position angle of -129°. This jet is found similar to the milliarcsecond-scale radio jet's position angle, suggesting it is straight from parsec to kiloparsec scales.[15] When seen through the jet's structure, there are four knot regions which increases orderly from the nucleus.[14]
The supermassive black hole in PKS 0208-512 is estimated to be 6 x 107Mʘ based on an assumption of its isotopic Eddington-limited emission.[2] A luminosity of Ld ≈ 8 x 1045 erg s−1 was estimated for its accretion disk.[9]