2008A&A...485..137C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.06CET01:30:23

2008A&A...485..137C - Astronomy and Astrophysics, volume 485, 137-152 (2008/7-1)

Molecular jets driven by high-mass protostars: a detailed study of the IRAS20126+4104 jet.

CARATTI O GARATTI A., FROEBRICH D., EISLOEFFEL J., GIANNINI T. and NISINI B.

Abstract (from CDS):

Protostellar jets from intermediate- and high-mass protostars provide an excellent opportunity to understand the mechanisms responsible for intermediate- and high-mass star-formation. A crucial question is if they are scaled-up versions of their low-mass counterparts. Such high-mass jets are relatively rare and, usually, they are distant and highly embedded in their parental clouds. The IRAS20126+4104 molecular jet, driven by a 104L protostar, represents a suitable target to investigate. We present here an extensive analysis of this protostellar jet, deriving the kinematical, dynamical, and physical conditions of the H2 gas along the flow. The jet was investigated by means of near-IR H2 and [FeII] narrow-band imaging, high-resolution spectroscopy of the 1-0S(1) line (2.12µm), NIR (0.9-2.5µm) low-resolution spectroscopy, along with ISO-SWS and LWS spectra (from 2.4 to 200µm). The flow shows a complex morphology. In addition to the large-scale jet precession presented in previous studies, we detect a small-scale wiggling close to the source, which may indicate the presence of a multiple system. The peak radial velocities of the H2 knots range from -42 to -14km/s in the blue lobe, and from -8 to 47km/s in the red lobe. The low-resolution spectra are rich in H2 emission, and relatively faint [FeII] (NIR), [OI] and [CII] (FIR) emission is observed in the region close to the source. A warm H2 gas component has an average excitation temperature that ranges between 2000K and 2500K. Additionally, the ISO-SWS spectrum reveals a cold component (520K) that strongly contributes to the radiative cooling of the flow and plays a major role in the dynamics of the flow. The estimated LH2 of the jet is 8.2±0.7L, suggesting that IRAS20126+4104 has a significantly increased accretion rate compared to low-mass YSOs. This is also supported by the derived mass flux rate from the H2 lines ({dot}(M)out(H2)∼7.5x10–4M/yr). The comparison between the H2 and the outflow parameters strongly indicates that the jet is driving the outflow, at least partially. As already found for low-mass protostellar jets, the measured H2 outflow luminosity is tightly related to the source bolometric luminosity. As for a few other intermediate- and high-mass protostellar jets in the literature, we conclude that IRAS20126+4104 jet is a scaled-up version of low-mass protostellar counterparts.

Abstract Copyright:

Journal keyword(s): stars: pre-main-sequence - infrared: ISM - ISM: jets and outflows - ISM: kinematics and dynamics - individual objects: IRAS20126+4104

Simbad objects: 16

goto Full paper

goto View the reference in ADS

Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRAS 07427-2400 mul 07 44 51.9 -24 07 41           ~ 55 0
2 WISE J074451.99-240742.1 mul 07 44 51.997 -24 07 42.11           ~ 64 0
3 IRAS 11101-5829 HII 11 12 18.0 -58 46 20           ~ 21 0
4 IRAS 16547-4247 Y*O 16 58 17.21 -42 52 08.9           ~ 119 0
5 IRAS 18151-1208 Y*O 18 17 58.114 -12 07 24.84           ~ 101 0
6 NAME HH 80-81 IRS HII 18 19 11.8 -20 47 35           ~ 135 0
7 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1508 0
8 [ACR98] D PoC 20 14 24.8 +41 13 53           ~ 2 0
9 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 403 0
10 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 68 0
11 HD 196296 * 20 35 11.2144682800 +36 08 48.510492653   9.20 9.04     A0 5 0
12 IRAS 23033+5951 Y*O 23 05 25.16112 +60 08 15.4428           ~ 80 0
13 [ACR98] A PoC ~ ~           ~ 2 0
14 [ACR98] C PoC ~ ~           ~ 2 0
15 [ACR98] B PoC ~ ~           ~ 2 0
16 HH 136J2 HH ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...485..137C and select 'bookmark this link' or equivalent in the popup menu


2021.03.06-01:30:23

© Université de Strasbourg/CNRS

    • Contact