The second classification are flat-spectrum radio quasars (FSRQs) with strong emission lines, whom PKS 0226-559 belongs to.

[11] According to observations conducted from the Large Area Telescope, one of the instruments has found that PKS 0226-559 shows an increasing gamma-ray emission from a source.

[12] It is believed that the accretion of matter is responsible for powering emission into the supermassive black hole in PKS 0226–559.

[9] The bolometric luminosity of PKS 0226-559 is found to exceed 1048 erg s−1 with γ-ray flux ranging between 4.84 × 10−10 to 1.50 × 10−7 photon cm-2 s-1.

Moreover, their γ-ray emission is important for probing the early universe given γ-ray emission from distant blazars undergoes attenuation via γγ absorption when they interact with extragalactic background light (EBL) photons, that enables observations constraining the EBL's density.