Parsec-scale jet properties of the gamma-ray quasar 3C 286

Abstract

The quasar 3C~286 is one of two compact steep spectrum sources detected by the {\it Fermi}/LAT. Here, we investigate the radio properties of the parsec(pc)-scale jet and its (possible) association with the $\gamma$-ray emission in 3C~286. The Very Long Baseline Interferometry (VLBI) images at various frequencies reveal a one-sided core--jet structure extending to the southwest at a projected distance of $\sim$1 kpc. The component at the jet base showing an inverted spectrum is identified as the core, with a mean brightness temperature of $2.8\times 10^9$~K. The jet bends at about 600 pc (in projection) away from the core, from a position angle of $-135^{\circ }$ to $-115^{\circ }$. Based on the available VLBI data, we inferred the proper motion speed of the inner jet as $0.013\pm 0.011$ mas yr${}^{-1}$ (${\beta }_{\mathrm{app}}=0.6\pm 0.5$), corresponding to a jet speed of about $0.5c$ at an inclination angle of $48^{\circ }$ between the jet and the line of sight of the observer. The brightness temperature, jet speed and Lorentz factor are much lower than those of $\gamma$-ray-emitting blazars, implying that the pc-scale jet in 3C~286 is mildly relativistic. Unlike blazars in which $\gamma$-ray emission is in general thought to originate from the beamed innermost jet, the location and mechanism of $\gamma$-ray emission in 3C~286 may be different as indicated by the current radio data. Multi-band spectrum fitting may offer a complementary diagnostic clue of the $\gamma$-ray production mechanism in this source.

9 pages, 4 figures, accept for publication in MNRAS

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