2007A&A...470..269Z


Query : 2007A&A...470..269Z

2007A&A...470..269Z - Astronomy and Astrophysics, volume 470, 269-279 (2007/7-4)

A jet-like outflow toward the high-mass (proto) stellar object IRAS 18566+0408.

ZHANG Q., SRIDHARAN T.K., HUNTER T.R., CHEN Y., BEUTHER H. and WYROWSKI F.

Abstract (from CDS):

Studies of high-mass protostellar objects reveal important information regarding the formation process of massive stars. We study the physical conditions in the dense core and molecular outflow associated with the high-mass protostellar candidate IRAS 18566+0408 at high angular resolution. We performed interferometric observations in the NH3(J,K)=(1,1), (2,2) and (3,3) inversion transitions, the SiO J=2-1 and HCN J=1-0 lines, and the 43 and 87GHz continuum emission using the VLA and OVRO. The 87GHz continuum emission reveals two continuum peaks MM-1 and MM-2 along a molecular ridge. The dominant peak MM-1 coincides with a compact emission feature at 43GHz, and arises mostly from the dust emission. For dust emissivity index β of 1.3, the masses in the dust peaks amount to 70M for MM-1, and 27M for MM-2. Assuming internal heating, the central luminosities of MM-1 and MM-2 are 6x104 and 8x103L, respectively. The SiO emission reveals a well collimated outflow emanating from MM-1. The jet-like outflow is also detected in NH3at velocities similar to the SiO emission. The outflow, with a mass of 27M, causes significant heating in the gas to temperatures of 70K, much higher than the temperature of ≲15K in the extended core. Compact (<3'') and narrow line (<1.5km/s) NH3(3,3) emission features are found associated with the outflow. They likely arise from weak population inversion in NH3similar to the maser emission. Toward MM-1, there is a compact NH3structure with a linewidth that increases from 5.5km/s FWHM measured at 3'' resolution to 8.7km/s measured at 1'' resolution. This linewidth is much larger than the FWHM of <2km/s in the entire core, and does not appear to originate from the outflow. This large linewidth may arise from rotation/infall, or relative motions of unresolved protostellar cores.

Abstract Copyright:

Journal keyword(s): ISM: kinematics and dynamics - ISM: H II regions - ISM: clouds - masers - ISM: jets and outflows - stars: formation

Nomenclature: Fig.1, text: [ZSH2007] MM-N (Nos 1 to 2).

Simbad objects: 14

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Number of rows : 14
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 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 196 2
2 NAME SH 2-233 IR Cl* 05 39 10.4 +35 45 19           ~ 94 0
3 IRAS 05358+3543 mul 05 39 10.4 +35 45 19           ~ 146 1
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5600 1
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4118 2
6 NGC 6334 HII 17 20 53 -36 07.9           ~ 646 0
7 PSR B1849+00 Psr 18 52 27.42 +00 32 02.0           ~ 67 0
8 [ZSH2007] MM-2 mm 18 59 09.21 +04 12 22.6           ~ 4 0
9 IRAS 18566+0408 Y*O 18 59 09.95520 +04 12 15.6240           ~ 126 0
10 [ZSH2007] MM-1 mm 18 59 09.99 +04 12 15.7           ~ 3 0
11 W 51 SNR 19 23 50 +14 06.0           ~ 1223 1
12 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 416 0
13 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 385 0
14 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 545 0

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2022.10.02-01:38:33

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