2007A&A...461..197W


Query : 2007A&A...461..197W

2007A&A...461..197W - Astronomy and Astrophysics, volume 461, 197-204 (2007/1-1)

VLA NH3 observations of regions of massive star formation in protostellar cores.

WANG Y., WU Y., ZHANG Q., MAO R.-Q. and MILLER M.

Abstract (from CDS):

The high angular resolution images with the Very Large Array (VLA) allow us to explore the general properties of protostellar cores in massive star forming regions at large distances. We observed the NH3(J,K)=(1,1) and (2,2) lines toward five massive protostar candidates (IRAS 18196-1331, IRAS 18352-0148, IRAS 18361-0627, IRAS 18414-0339 and IRAS 19474+2637) with the VLA D configuration. We found that these objects have hundreds of solar masses in dense gas with rotation temperatures from 8 to 27K. No 1.3cm continuum emission was detected at an rms of ∼0.7mJy in all sources except IRAS 18361-0627. We identified 60 clumps and determined their physical parameters (e.g. line width, rotation temperature, size, and mass). The clump masses range from 0.1M to 4800M. The average size, line width and temperature are 0.1±0.06pc, 1.3±0.4km/s and 16±5K. The discrepancy between NH33 and (sub)mm continuum emission is found in IRAS 18196-1331. This phenomenon could occur as a result of the NH33 abundance variation being affected by the UV illumination.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: kinematics and dynamics - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/461/197): sources.dat fig/*>

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4003 3
2 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 205 2
3 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1098 1
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5797 1
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4337 2
6 [MV2004] RS 4 Rad 18 22 26.37 -13 30 11.9           ~ 4 0
7 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 284 0
8 IRAS 18352-0148 * 18 37 50.495 -01 45 39.42           ~ 7 0
9 IRAS 18361-0627 mul 18 38 51.7 -06 25 01           ~ 17 0
10 [BNM96] 028.882-0.021 HII 18 44 06.4229282376 -03 36 34.858060632           ~ 8 0
11 MSX6C G028.8829-00.0191 MIR 18 44 06.7 -03 36 42           ~ 1 0
12 IRAS 18566+0408 Y*O 18 59 09.95520 +04 12 15.6240           ~ 133 0
13 2MASS J19493209+2645151 Y*O 19 49 32.09928 +26 45 15.1200           ~ 4 0
14 IRAS 19474+2637 IR 19 49 32.2352001912 +26 45 26.312895432           ~ 11 0
15 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 440 0

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