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J/ApJ/625/891     Clumps in NGC 7538 at 450 and 850µm     (Reid+, 2005)

High-mass star formation. I. The mass distribution of submillimeter clumps in NGC 7538. Reid M.A., Wilson C.D. <Astrophys. J., 625, 891-905 (2005)> =2005ApJ...625..891R
ADC_Keywords: Millimetric/submm sources ; Interstellar medium Keywords: ISM: individual (NGC 7538) - ISM: structure - methods: data analysis - stars: formation - submillimeter Abstract: We present submillimeter continuum maps at 450 and 850µm of a 12'x8' region of the NGC 7538 high-mass star-forming region, made using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. We used an automated clump-finding algorithm to identify 67 clumps in the 450µm image and 77 in the 850µm image. Description: The data were obtained on the nights of 2003 April 15, 16, 20, and June 16 using SCUBA at the James Clerk Maxwell Telescope (JCMT). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 98 77 Properties of the 850µm Clumps table3.dat 98 67 Properties of the 450µm clumps
Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- [RW2005] Name (1) 8 A1 --- n_[RW2005] [e] corrections applied (2) 9- 10 I2 h RAh Hour of Right Ascension (J2000.0) 12- 13 I2 min RAm Minute of Right Ascension (J2000.0) 15- 18 F4.1 s RAs Second of Right Ascension (J2000.0) 19 A1 --- DE- Sign of the Declination (J2000.0) 20- 21 I2 deg DEd Degree of Declination (J2000.0) 23- 24 I2 arcmin DEm Arcminute of Declination (J2000.0) 26- 27 I2 arcsec DEs Arcsecond of Declination (J2000.0) 29- 32 F4.2 pc Reff Effective radius 34- 38 F5.2 Jy Sp Peak flux density, in Jy/beam 40- 44 F5.2 Jy e_Sp Error in Sp, in Jy/beam (3) 46- 51 F6.2 Jy Si Integrated flux density, in Jy/beam 53- 58 F6.2 Jy e_Si Error in Si, in Jy/beam (3) 60- 63 F4.2 --- S.I. ? Spectral index (only in Table 2) (4) 65- 67 I3 K Td ? Mean dust temperature (only in Table 2) (5) 69- 75 F7.2 solMass M(35K) Mass calculated with fixed Td (Td=35K) 77- 82 F6.2 solMass e_M(35K) Error in M(35K) (3) 84- 89 F6.2 solMass M(Td) ? Mass calculated with estimated Td (only in Table 2) 91- 95 F5.2 solMass e_M(Td) ? Error in M(Td) (only in Table 2) (3) 97- 98 I2 --- Npsc Number of 2MASS point sources contained within the clump's 0.5Speak contour
Note (1): Names in Simbad are [RW2005] SMM NN for Table 2, and [RW2005] SMM NNA for Table 3. Note (2): "e" indicates a clump to which corrections for free-free emission have been applied in the calculation of the spectral index, dust temperature, and masses. The free-free correction has not been applied to the peak and integrated fluxes listed here. Note (3): The uncertainties stated in this table are the systematic ones, composed of the uncertainties in the gain calibration, the sky opacities, and the corrections due to the error beam. The systematic uncertainties are typically significantly larger than the random errors. The exception is the peak flux, where the random error of σ=0.021Jy/beam dominates the systematic error for the lower peak fluxes. Note (4): The systematic uncertainty in the spectral index, α, is 13%. Note (5): Temperatures are omitted where high spectral index makes them incalculable, or where no reliable spectral index can be calculated (see text)
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 24-Nov-2005
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