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Table 4

Properties of the knots along the HH 212 jet.

Knot RA Dec d tan d V τ dyn HVjet N H2 n H2 Ṁ jet
(″) (″) (′′) (AU) (km s-1) (yr) (km s-1) (cm-2) (cm-3) (M⊙ yr-1)
B2 + 0.63 + 1.42 + 1.55 700 −118 30 [−8,−15 ] ≥ 0.4−2.1 × 1021 * ≥ 0.6−3.1 × 106 * ≥ 0.4−1.9 × 10-6 *
B3 + 0.25 + 0.63 + 0.68 300 −92 15 [−8,−15 ] 0.2−1.2 × 1021 0.3−1.8 × 106 0.2−1.1 × 10-6
R2 −0.59 −1.30 −1.43 650 + 110 30 [ + 10, + 15 ] 0.2 − 1.1 × 1021 0.3−1.6 × 106 0.2−1.0 × 10-6

Notes. Position offset (RA and Dec in ′′), on-sky, and de-projected distance from the MM1 protostar (dtan in ′′ and d in AU), de-projected peak velocity (V in km s-1), dynamical timescale (τdyn in yr), high-velocity range on which the jet properties are estimated (HVjet in km s-1), beam-averaged H2 column density (NH2 in cm-2), H2 volume density (nH2 in cm-3), and mass-loss rate (Ṁjet in M⊙ yr-1).

(*)

As CO 3–2 is optically thick in knot B2, the estimated CO column density, NCO, and hence H2 column and volume density, NH2 and nH2, and mass-loss rate, Ṁjet, are lower limits.

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