1999A&A...343..571G


Query : 1999A&A...343..571G

1999A&A...343..571G - Astronomy and Astrophysics, volume 343, 571-584 (1999/3-2)

The jet-driven molecular outflow of HH211.

GUETH F. and GUILLOTEAU S.

Abstract (from CDS):

We present high angular resolution (down to ∼1.5'') interferometric maps of the CO J=1->0 and J=2->1 emission in the molecular outflow associated with the extremely young HH211 jet, which is located in the IC348 molecular complex. At velocities close to the systemic velocity, the CO emission traces the outflow cavities, while an extremely collimated, continuous jet-like structure is observed at high CO velocities. The continuum emission reveals a ∼0.2M dust condensation surrounding the central exciting (Class 0) protostar, clearly resolved and elongated perpendicular to the jet axis. The strong (bow-)shocks observed in vibrationally excited H2 emission are located at the terminal ends of the jet and the low-velocity CO cavities are precisely situated in their wake. Hence, the overall structure of HH211 perfectly fits into the picture of a jet-driven flow and strongly supports shock-entrainment models as the formation mechanisms of young, embedded molecular outflows. The shape of the cavities traced by the low-velocity CO emission can actually be (surprisingly well) reproduced by a simple, semi-analytical toy-model of a jet-driven flow, in which prompt entrainment occurs at the head of a travelling bow-shock. The estimated jet mass and mass loss rate yield a timescale of order one thousand years, in agreement with the kinematical age. Finally, we discuss the physical properties of the different parts of the outflow, and especially the actual nature of the high-velocity CO jet.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: Herbig-Haro objects - ISM: individual objects: HH 211 - ISM: jets and outflows - ISM: molecules - radio lines: ISM

Nomenclature: NAME HH 211-mm N=1.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3769 3
2 LDN 1448 DNe 03 22.5 +30 35           ~ 496 0
3 IRAS 03258+3104 Y*O 03 28 55.30 +31 14 27.8           ~ 163 1
4 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 431 3
5 HH 211 cor 03 43 56.52 +32 00 52.8           ~ 325 0
6 NAME HH 211-mm Y*O 03 43 56.816 +32 00 50.06           ~ 62 1
7 IC 348 OpC 03 44 32 +32 09.5           ~ 1301 1
8 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 894 1
9 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 93 0
10 HH 375 Y*O 20 39 06.2 +68 02 15           ~ 176 0
11 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 537 0

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2022.05.29-03:18:42

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