Query : 2004A&A...425..981D

2004A&A...425..981D - Astronomy and Astrophysics, volume 425, 981-995 (2004/10-3)

Collimated molecular jets from high-mass young stars: IRAS18151-1208.


Abstract (from CDS):

Recent near-IR images of massive star forming regions have revealed two collimated jets in the IRAS18151-1208 region, one of which is almost a parsec in length (Varricatt et al., 2004, in prep.). Follow-up high-spectral-resolution echelle spectroscopy and 2-dimensional ``integral field'' spectroscopy of the associated molecular shock features are presented here. From these data kinematic information and excitation maps are extracted, which show that the two jets are morphologically, kinematically and energetically similar to their counterparts from low mass protostars. The close association between the H2 emission features and the high-velocity CO emission presented by Beuther et al. also suggests that the CO represents gas entrained by these two very collimated jets. From the mass and momentum of the molecular gas, and the luminosity of the H2 features, it is clear that the flows must be powered by massive sources. To all intents and purposes, the molecular jets appear to be scaled-up versions of low-mass YSO jets. Collectively, the observations add further support to the idea that massive stars are formed through vigorous disk accretion, and that, while in their earliest stages of evolution, massive protostars drive collimated jets.

Abstract Copyright:

Journal keyword(s): molecular data - shock waves - stars: formation - infrared: ISM - infrared: stars - ISM: Herbig-Haro objects

CDS comments: Figs 2, 3, Table 2: Knots 'A' and 'AN' in IRAS 18151-1208 jets are not in SIMBAD.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 2MASS J03290842+3115284 NIR 03 29 08.420 +31 15 28.48           ~ 228 1
2 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 373 1
3 HD 163336 PM* 17 56 19.0354512072 -15 48 45.101447424   5.967 5.929     A0V 59 0
4 IRAS 18151-1208 Y*O 18 17 58.1254 -12 07 24.893           ~ 104 0

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