J/A+A/534/A131 Clumps in the giant molecular cloud G345.5+1.0 (Lopez+, 2011)
Massive star formation in the GMC G345.5+1.0: spatial distribution of the dust
emission.
Lopez C., Bronfman L., Nyman L.-A., May J., Garay G.
<Astron. Astrophys. 534, A131 (2011)>
=2011A&A...534A.131L 2011A&A...534A.131L
ADC_Keywords: Millimetric/submm sources ; Molecular clouds
Keywords: ISM: clouds - stars: formation - dust, extinction - stars: massive -
Galaxy: structure - galaxies: star formation
Abstract:
Massive condensations in giant molecular clouds (GMCs) are linked to
the formation of high mass stars, which are the principal source of
heavy elements and UV radiation, playing an important role in the
evolution of galaxies.
We attemp to make a complete census of massive-star formation within
all of GMC G345.5+1.0. This cloud is located one degree above the
Galactic plane and at 1.8kpc from the Sun, thus there is little
superposition of dust along the line-of-sight, minimizing confusion
effects in identifying individual clumps.
GMC G345.5+1.0 is located approximately between 344.5° and
346.5° in Galactic longitude, and between 0.2° and 2.0° in
Galactic latitude.
Description:
Observations toward the whole GMC 345.5+1.0 were made using SIMBA
Bolometer in 1.2mm continuum emission. The observations have a
spatial distribution of 0.2pc and cover 1.8°x2.2° in the sky
with a noise of 20mJy/beam. 201 clumps were identified with diameters
between 0.2 and 0.6pc, masses between 3.0 and 1.3x103M☉, and
densities between 5x103 and 4x105cm-3. Observations were made in
October 2002 and July 2003.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 52 201 Characteristics of the 201 clumps observed with SIMBA
--------------------------------------------------------------------------------
See also:
J/A+A/426/119 : RCW 106 Giant Molecular Cloud 1.2mm mapping (Mookerjea+, 2004)
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Name Name of the source
5- 11 F7.3 deg GLON Galactic longitude of peak in 1.2mm
continuum emission
13- 17 F5.3 deg GLAT Galactic latitude of peak in 1.2mm
continuum emission
19- 24 F6.3 Jy S1.2mm Flux density at 1.2mm
26- 28 F3.1 pc Diam ?=- Diameter of source
30- 35 F6.1 Msun Mass Esimated clump mass
37- 42 E6.2 cm-3 Dens ?=- Density (1)
44- 50 E7.2 cm-2 N ?=- Column density (1)
52 A1 --- IR [Y/N] Infrared counterpart (2)
--------------------------------------------------------------------------------
Note (1): The densities and the column densities are computed assuming a
mean molecular weight of = 2.29.
Note (2): Infrared counterpart shows if clumps are detected in all infrared
MSX and Spitzer-IRAC bands ("Y") or not ("N").
--------------------------------------------------------------------------------
Acknowledgements:
C. Lopez, clopezcalderon(at)gmail.com
(End) Patricia Vannier [CDS] 31-Oct-2011