J/AJ/136/2083 Clumps in NGC 6334 from 450/850um observations (Matthews+, 2008)
The distribution and properties of cold dust in NGC 6334.
Matthews H.E., McCutcheon W.H., Kirk H., White G.J., Cohen M.
<Astron. J., 136, 2083-2101 (2008)>
=2008AJ....136.2083M 2008AJ....136.2083M
ADC_Keywords: Supernova remnants ; Millimetric/submm sources ;
Interstellar medium
Keywords: ISM: clouds - ISM: individual (NGC 6334) - ISM: structure -
radio continuum: ISM - stars: formation - techniques: image processing
Abstract:
NGC 6334 is a galactic star-forming region in Scorpius, heavily
obscured by intervening dust. The region consists of several major
sites of star formation known previously from far-infrared (IR) and
radio-wavelength observations. We present images of NGC 6334 obtained
at wavelengths of 850 and 450um with the Submillimeter Common-User
Bolometric Array at the James Clerk Maxwell Telescope. These data
highlight the distribution of dense cold dust, a particularly striking
feature of which is a narrow ridge of emission passing between most of
the star-forming centers. We use a clump-finding technique to quantify
the distribution of dust emission throughout the region, and we obtain
estimates of the sizes, masses, and temperatures of the clump ensemble
under simple assumptions.
Description:
The principal data reported here were obtained on 1998 June 26 and
July 1 with the bolometer array camera Submillimeter Common-User
Bolometric Array instrument (SCUBA) deployed on the James Clerk
Maxwell Telescope (JCMT). The observations were made simultaneously in
the two primary wavebands, centered at 850 and 450um, in the
chop/scan mapping mode, as was commonly used for SCUBA observations of
extended fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 168 Clumpfind results for NGC 6334
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See also:
J/ApJS/69/99 : NGC 6334 centers of star formation JHK phot. (Straw+ 1989)
J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994)
J/A+A/316/102 : JHK Photometry in NGC 6334 (Tapia+, 1996)
J/A+A/357/1020 : JHK photometry in NGC 6334 IV (Persi+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Clump sequential number,
<[MMK2008] NNN> in Simbad
5- 6 I2 h RAh Right ascension (J2000) (1)
8- 9 I2 min RAm Right ascension (J2000) (1)
11- 15 F5.2 s RAs Right ascension (J2000) (1)
17 A1 --- DE- Declination sign (J2000) (1)
18- 19 I2 deg DEd Declination (J2000) (1)
21- 22 I2 arcmin DEm Declination (J2000) (1)
24- 28 F5.2 arcsec DEs Declination (J2000) (1)
30- 34 F5.2 Jy Speak SCUBA/850µm peak flux density (Jy/beam) (2)
36- 41 F6.2 Jy Stot SCUBA/850µm total flux density (2)
43- 46 F4.1 arcsec Radius Effective radius of the equivalent circular
clump (3)
48- 53 F6.1 Msun Mass Clump mass (4)
55- 58 F4.2 --- C Concentration parameter (5)
60- 63 F4.1 --- Rpeak 450/850um peak flux ratio
65- 68 F4.1 --- Rtot 450/850um total flux ratio
70- 71 I2 K Tp ?=- Inferred 450/850um peak flux ratio
temperature (6)
73- 74 I2 K Ts ?=- Inferred 450/850um total flux ratio
temperature (6)
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Note (1): Position of peak surface brightness within clump (accurate to 3").
Note (2): Peak flux, total flux, radius, and concentration are derived from
clfind (Williams et al., 1994, Cat. J/ApJ/428/693). The peak and total fluxes
have uncertainties up to 20% at 850um, mostly due to flux calibration.
Note (3): The radius has not been deconvolved with the telescope beam.
Note (4): Clump masses calculated assuming a constant temperature of 25K, a dust
opacity of 0.02cm2/g and a distance of 1700pc (see Equation (2)).
Note (5): The concentration was calculated using Equation (3).
Note (6): Temperatures were calculated to a maximum of 60K; those above 22K are
not well determined in an absolute sense. See Section 6 for further details.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-May-2011