J/A+A/592/A54 Combined ArTeMiS+SPIRE 350um image of NGC6334 (Andre+, 2016)
Characterizing filaments in regions of high-mass star formation:
High-resolution submilimeter imaging of the massive star-forming complex
NGC 6334 with ArTeMiS.
Andre P., Reveret V., Konyves V., Arzoumanian D., Tige J., Gallais P.,
Roussel H., Le Pennec J., Rodriguez L., Doumayrou E., Dubreuil D.,
Lortholary M., Martignac J., Talvard M., Delisle C., Visticot F., Dumaye L.,
De Breuck C., Shimajiri Y., Motte F., Bontemps S., Hennemann M., Zavagno A.,
Russeil D., Schneider N., Palmeirim P., Peretto N., Hill T., Minier V.,
Roy A., Rygl K.L.J.
<Astron. Astrophys. 592, A54 (2016)>
=2016A&A...592A..54A 2016A&A...592A..54A (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Molecular clouds ; Nebulae ; H II regions
Keywords: stars: formation - circumstellar matter - ISM: clouds -
ISM: structure - ISM: individual objects: NGC 6334 -
submillimeter: ISM
Abstract:
Herschel observations of nearby molecular clouds suggest that
interstellar filaments and prestellar cores represent two fundamental
steps in the star formation process. The observations support a
picture of low-mass star formation according to which filaments of
∼0.1pc width form first in the cold interstellar medium, probably as a
result of large-scale compression of interstellar matter by supersonic
turbulent flows, and then prestellar cores arise from gravitational
fragmentation of the densest filaments. Whether this scenario also
applies to regions of high-mass star formation is an open question, in
part because the resolution of Herschel is insufficient to resolve the
inner width of filaments in the nearest regions of massive star
formation.
In an effort to characterize the inner width of filaments in high-mass
star-forming regions, we imaged the central part of the NGC 6334
complex at a resolution higher by a factor of >3 than Herschel at
350microns.
We used the large-format bolometer camera ArTeMiS on the APEX
telescope and combined the high-resolution ArTeMiS data at 350microns
with Herschel/HOBYS data at 70-500microns to ensure good sensitivity
to a broad range of spatial scales. This allowed us to study the
structure of the main narrow filament of the complex with a resolution
of 8" or <0.07pc at d∼1.7kpc.
Our study confirms that this filament is a very dense, massive linear
structure with a line mass ranging from ∼500M☉/pc to
∼2000M☉/pc over nearly 10pc. It also demonstrates for the first
time that its inner width remains as narrow as W∼0.15±0.05pc all
along the filament length, within a factor of <2 of the characteristic
0.1pc value found with Herschel for lower-mass filaments in the Gould
Belt.
While it is not completely clear whether the NGC 6334 filament will
form massive stars in the future, it is two to three orders of
magnitude denser than the majority of filaments observed in Gould Belt
clouds, and has a very similar inner width. This points to a common
physical mechanism for setting the filament width and suggests that
some important structural properties of nearby clouds also hold in
high-mass star-forming regions.
Description:
High dynamic range dust continuum map of the NGC 6334 star-forming
complex at 350 microns obtained by combining high-resolution
ground-based observations taken with the ArTeMiS camera on the APEX
telescope and Herschel Space Observatory data from the HOBYS key
project (Motte et al., 2010A&A...518L..77M 2010A&A...518L..77M; Russeil et al.
2013A&A...554A..42R 2013A&A...554A..42R). The effective angular resolution is ∼ 8" (HPBW).
Objects:
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RA (2000) DE Designation(s)
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17 20 51 -36 06.9 NGC 6334 = NAME Cat's Paw Nebula
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 118 1 Information of fits image
ngc6334.fits 2880 500 Fits image
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See also:
J/A+A/481/169 : ATCA 3mm obs. of NGC 6334I and NGC 6334I(N) (Beuther+, 2008)
J/A+A/587/A135 : Halpha images of NGC 6334 and NGC 6357 (Russeil+, 2016)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension of center (J2000)
4- 5 I2 min RAm Right Ascension of center (J2000)
7- 11 F5.2 s RAs Right Ascension of center (J2000)
13 A1 --- DE- Declination sign of center (J2000)
14- 15 I2 deg DEd Declination of center (J2000)
17- 18 I2 arcmin DEm Declination of center (J2000)
20- 21 I2 arcsec DEs Declination of center (J2000)
23- 25 F3.1 arcsec/pix scale Scale of the image
27- 30 I4 --- Nx Number of pixels along X-axis
32- 35 I4 --- Ny Number of pixels along Y-axis
37- 40 I4 Kibyte size Size of FITS file
42- 71 A30 --- FileName Name of FITS file
73-118 A46 --- Title Title of the FITS file
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Acknowledgements:
Philippe Andre, pandre(at)cea.fr
(End) Philippe Andre [CEA, France], Patricia Vannier [CDS] 31-May-2016