THE GAMMA-RAY-EMITTING QUASAR 0202+149: A CSS REVISITED

  • An T
  • Cui Y
  • Baan W
  • et al.
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Abstract

PKS 0202+149 is a low-power radio source with blazar-like, γ -ray active galactic nucleus (AGN) characteristics. We investigate its properties and classification in relation to its γ -ray characteristics. This source shows a hint of low-frequency turnover at about 200 MHz. Radio imaging data of 0202+149 at different frequencies show differing morphologies on both kiloparsec (kpc) and parsec (pc) scales. The overall source shows a triple structure of a core and double lobes with a total projected size of ∼1.3 kpc. The compact source structure of 0202+149 is reminiscent of a compact steep spectrum (CSS) source. At pc scales, a core-jet structure extends ∼25 pc (in projection) at a position angle perpendicular to the kpc-scale structure. The curved pc-scale structure with a jet and inner lobe suggests that the CSS nuclear activity has recently re-started, although its power has been decreasing, while the kpc-scale lobes are relics of earlier activity. A maximum apparent superluminal motion of is detected in the jet components, indicating a highly relativistic jet flow. The brightness temperature of the core is lower than the average value found for highly beamed, γ -ray AGNs, indicating a lower radio power and a relatively lower Doppler boosting factor. The CSS radio classification indicates that blazar-like γ -ray properties can also be manifested in low-power CSS radio sources with the appropriate jet and beaming properties.

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APA

An, T., Cui, Y.-Z., Baan, W. A., Wang, W.-H., & Mohan, P. (2016). THE GAMMA-RAY-EMITTING QUASAR 0202+149: A CSS REVISITED. The Astrophysical Journal, 826(2), 190. https://doi.org/10.3847/0004-637x/826/2/190

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