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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 168 Clumpfind results for NGC 6334
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
Bytes Format Units Label Explanations
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)
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.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 19-May-2011
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