2006A&A...457..157G


Query : 2006A&A...457..157G

2006A&A...457..157G - Astronomy and Astrophysics, volume 457, 157-166 (2006/10-1)

HH135/HH136 - a luminous H2 outflow towards a high-mass protostar.

GREDEL R.

Abstract (from CDS):

Molecular hydrogen observations towards Herbig-Haro objects provide the possibility of studying physical processes related to star formation. Observations towards the luminous IRAS source IRAS 11101-5829 and the associated Herbig-Haro objects HH135/HH136 are obtained to understand whether high-mass stars form via the same physical processes as their low-mass counterparts. Near-infrared imaging and spectroscopy are used to infer H2 excitation characteristics. A theoretical H2 spectrum is constructed from a thermal ro-vibrational population distribution and compared to the observations. The observations reveal the presence of a well-collimated, parsec-sized H2 outflow with a total H2 luminosity of about 2L. The bulk of the molecular gas is characterized by a ro-vibrational excitation temperature of 2000±200K. A small fraction (0.3%) of the molecular gas is very hot, with excitation temperatures around 5500K. The molecular emission is associated with strong [FeII] emission. The H2 and [FeII] emission characteristics indicate the presence of fast, dissociative J-shocks at speeds of vs≃100km/s. Electron densities of ne=3500-4000cm–3 are inferred from the [FeII] line ratios. The large H2 luminosity combined with the very large source luminosity suggests that the high-mass protostar that powers the HH135/HH136 flow forms via accretion, but with a significantly increased accretion rate compared to that of low-mass protostars.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: HH135 - ISM: individual objects: HH136 - ISM: Herbig-Haro objects - ISM: jets and outflows

Simbad objects: 25

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Number of rows : 25
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 HH 135 HH 11 12 16.462 -58 46 34.33           ~ 16 0
2 NAME HH 135-136 HH 11 12 18 -56 46.3           ~ 9 0
3 HH 136 HH 11 12 19.6 -58 46 04           ~ 16 0
4 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 395 0
5 IRAS 16547-4247 Y*O 16 58 17.21 -42 52 08.9           ~ 132 0
6 IRAS 18151-1208 Y*O 18 17 58.114 -12 07 24.84           ~ 102 0
7 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 204 0
8 HH 99 HH 19 02 05.3 -36 54 40           ~ 28 0
9 HH 136J1 HH ~ ~           ~ 1 0
10 HH 136I2 HH ~ ~           ~ 1 0
11 HH 136H1 HH ~ ~           ~ 1 0
12 HH 136I1 HH ~ ~           ~ 1 0
13 HH 136D2 HH ~ ~           ~ 1 0
14 HH 135e HH ~ ~           ~ 1 0
15 HH 136H2 HH ~ ~           ~ 1 0
16 HH 135a HH ~ ~           ~ 1 0
17 HH 136B4 HH ~ ~           ~ 1 0
18 HH 136J2 HH ~ ~           ~ 2 0
19 HH 135d HH ~ ~           ~ 1 0
20 HH 136B3 HH ~ ~           ~ 1 0
21 HH 136B2 HH ~ ~           ~ 1 0
22 HH 136J3 HH ~ ~           ~ 1 0
23 HH 136B1 HH ~ ~           ~ 1 0
24 HH 136D3 HH ~ ~           ~ 1 0
25 HH 136D1 HH ~ ~           ~ 1 0

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2022.05.18-23:57:32

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