J/A+A/490/213 1.4 and 3.4mm interferometry of W3 IRS5 (Rodon+, 2008)
Millimeter interferometry of W3 IRS5: A Trapezium in the making.
Rodon J.A., Beuther H., Megeath T., van der Tak F.F.S.
<Astron. Astrophys. 490, 213 (2008)>
=2008A&A...490..213R 2008A&A...490..213R
ADC_Keywords: Interstellar medium ; Infrared sources ; Interferometry
Keywords: instrumentation: high angular resolution -
instrumentation: interferometers -
ISM: individual objects: W3 IRS5 - stars: formation
Abstract:
We present the results of PdBI 1.4 and 3.4mm interferometric
observations of the high-mass star-forming region W3 IRS5 in the AB
configurations. From the continuum maps we identified five individual
sources with counterparts in the NIR, MIR or radio (Q-band), except
for one source that is a new identification. Three of the sources are
within the inner 2100AU, where the protostellar number density exceeds
106 protostars pc-3 assuming spherical symmetry. Lower limits for
the circumstellar masses of the sources range from ∼0.3 to ∼40M☉
although they were strongly affected by the spatial filtering of the
interferometer. We mapped the SiO(2-1), SiO(5-4), SO2(22-22), and
SO2(8-9) molecular transitions. We identify five molecular outflows in
SiO, two of them nearly in the line of sight direction. The SO2
velocity structure indicates a rotating, bound system, and we find
tentative signatures of converging flows as predicted by the
gravoturbulent star formation and converging flow theories. The
obtained data strongly indicate that the clustered environment has a
major influence on the formation of high-mass stars; however, our data
do not clearly allow us to distinguish whether the ongoing
star-forming process follows a monolithic collapse or a competitive
accretion mechanism.
Description:
6 fits files, respectively containing: maps of continuum flux at 87
and 217GHz; and maps of SiO(2-1), SiO(5-2), SO2(22-22), and SO2(8-9)
flux per velocity channel. These data correspond to Figures 2, 3, and
5 of the paper.
Objects:
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RA (2000) DE Designation(s)
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02 25 40.68 +62 05 51.53 W3 IRS5 = [WBN72] W 3 IRS 5
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
maps.dat 102 6 Maps list
fits/* . 6 Fits files
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Byte-by-byte Description of file: maps.dat
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Bytes Format Units Label Explanations
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1- 28 A28 --- FileName Name of the file in subdirectory fits
30-102 A73 --- Title Title and characteristics of the file in
fits subdirectory
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Acknowledgements:
Javier A. Rodon, rodon(at)mpia-hd.mpg.de
(End) J.A. Rodon [MPIA, Heidelberg, Germany], P. Vannier [CDS] 02-Sep-2008