title: The parsec-scale jet in M87.
abstract: We briefly review the observed structure and evolution of the M87 jet on scales less, similar1 parsec (pc; 1 pc = 3.09 x 10(16) m). Filamentary features, limb-brightening, and side-to-side oscillation are common characteristics of the pc-scale, and kpc-scale jets. The most prominent emission features on both the pc and subpc scales appear stationary (v/c < 0.1). Nonetheless, based on the jet's flux evolution, the presence of kpc-scale superluminal motion, and the absence of a visible counter-jet, we argue for the presence of an underlying relativistic flow, consistent with unified models. The initial jet collimation appears to occur on scales <0.1 pc, thus favoring electromagnetic processes associated with a black hole and accretion disk.
authors.affiliation: Space Telescope Science Institute, Baltimore, MD 21218, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Biretta
authors.forename: W
authors.initials: W
authors.lastname: Junor