Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-29
Mon.Not.Roy.Astron.Soc. 337 (2002) 327
Astronomy and Astrophysics
Astrophysics
7 pages, 5 figures. Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2002.05916.x
A spatially unresolved velocity feature, with an approaching radial velocity of ~100 km/s with respect to the systemic radial velocity, in a position-velocity array of [O III] 5007 line profiles is identified as the kinematical counterpart of a jet from the proplyd LV 5 (158-323) in the core of the Orion Nebula. The only candidate in HST imagery for this jet appears to be a displaced, ionized knot. Also an elongated jet projects from the proplyd GMR 15 (161-307). Its receding radial velocity difference appears at ~80 km/s in the same position-velocity array. A `standard' model for jets from young, low mass stars invokes an accelerating, continuous flow outwards with an opening angle of a few degrees. Here an alternative explanation is suggested which may apply to some, if not all, of the proplyd jets. In this, a `bullet' of dense material is ejected which ploughs through dense circumstellar ambient gas. The decelerating tail of material ablated from the bullet's surface would be indistinguishable from a continuously emitted jet in current observations.
Graham M. F.
Meaburn John
Redman Matt P.
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