2006A&A...447..929P


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:52:31

2006A&A...447..929P - Astronomy and Astrophysics, volume 447, 929-936 (2006/3-1)

High mass star formation in the infrared dark cloud G11.11-0.12.

PILLAI T., WYROWSKI F., MENTEN K.M. and KRUEGEL E.

Abstract (from CDS):

We report detection of moderate to high-mass star formation in an infrared dark cloud (G11.11-0.12) where we discovered class II methanol and water maser emission at 6.7GHz and 22.2GHz, respectively. We also observed the object in ammonia inversion transitions. Strong emission from the (3,3) line indicates a hot (60K) compact component associated with the maser emission. The line width of the hot component (4km/s), as well as the methanol maser detection, are indicative of high mass star formation. To further constrain the physical parameters of the source, we derived the spectral energy distribution (SED) of the dust continuum by analysing data from the 2MASS survey, HIRAS, MSX, the Spitzer Space Telescope, and interferometric 3mm observations. The SED was modelled in a radiative transfer program: a) the stellar luminosity equals ∼1200L corresponding to a ZAMS star of 8M; b) the bulk of the envelope has a temperature of 19 K; c) the mass of the remnant protostellar cloud in an area 8x1017cm or 15'' across amounts to 500M, if assuming standard dust of the diffuse medium, and to about 60M, should the grains be fluffy and have ice mantles; d) the corresponding visual extinction towards the star, AV, is a few hundred magnitudes. The near IR data can be explained by scattering from tenuous material above a hypothetical disk. The class II methanol maser lines are spread out in velocity over 11km/s. To explain the kinematics of the masing spots, we propose that they are located in a Kepler disk at a distance of about 250AU. The dust temperatures there are around 150K, high enough to evaporate methanol-containing ice mantles.

Abstract Copyright:

Journal keyword(s): masers - stars: formation - molecular data - radiative transfer - astronomical databases: miscellaneous

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [MCK88] NGC 2024 FIR 4 Y*O 05 41 44.00 -01 54 42.0           ~ 55 0
2 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 851 1
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3733 1
4 IRAS 16272-4837 HII 16 30 59.2 -48 43 48           ~ 21 0
5 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 271 0
6 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 984 1
7 MMB G011.109-00.114 Y*O 18 10 28.4449 -19 22 38.782           ~ 47 0
8 [CCE98b] 011.11-0.12 Cld 18 10.5 -19 23           ~ 85 1
9 QSO J1820-2528 QSO 18 20 57.84869182 -25 28 12.5836842   18.56       ~ 79 0
10 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 439 0
11 [CUS2014] G030.7016-0.0672 cor 18 47 36.6 -02 00 54           ~ 45 0
12 [MSL2003] W43-MM1 cor 18 47 47.0 -01 54 28           ~ 95 0
13 GAL 079.3+00.3 DNe 20 32.3 +40 15           ~ 12 1

    Equat.    Gal    SGal    Ecl

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2020.08.04-22:52:31

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