J/MNRAS/424/1658 Molecular clumps in W51 giant molecular cloud (Parsons+, 2012)
Molecular clumps in the W51 giant molecular cloud.
Parsons H., Thompson M.A., Clark J.S., Chrysostomou A.
<Mon. Not. R. Astron. Soc., 424, 1658-1671 (2012)>
=2012MNRAS.424.1658P 2012MNRAS.424.1658P
ADC_Keywords: Molecular clouds ; Radial velocities
Keywords: molecular data - catalogues - stars: formation - ISM: clouds -
submillimetre: ISM
Abstract:
In this paper, we present a catalogue of dense molecular clumps
located within the W51 giant molecular cloud (GMC). This work is
based on Heterodyne Array Receiver Programme 13CO J=3-2 observations
of the W51 GMC and uses the automated CLUMPFIND algorithm to decompose
the region into a total of 1575 clumps of which 1130 are associated
with the W51 GMC. We clearly see the distinct structures of the W51
complex and the high-velocity stream previously reported.
Description:
The W51 GMC was mapped using the Heterodyne Array Receiver Programme
(HARP) receiver with the back-end digital autocorrelator spectrometer
Auto-Correlation Spectral Imaging System (ACSIS) on the James Clerk
Maxwell Telescope (JCMT).
Data were taken in 2008 May.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 445 Properties for the 445/1575 clumps identified by
CLUMPFIND within the region observed by HARP
with velocities <56km/s
table2.dat 76 1130 Properties for the 1130/1575 clumps identified
by CLUMPFIND associated with the W51 GMC
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See also:
J/MNRAS/353/1025 : JHK photometry of 4 W51 star clusters (Nanda+, 2004)
J/ApJ/706/83 : Embedded YSO candidates in W51 (Kang+, 2009)
J/ApJ/720/1055 : VBLA observations of W51 Main/South (Sato+, 2010)
J/ApJS/191/232 : CO survey of W51 molecular cloud (Bieging+, 2010)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Clump name, GLL.ll+B.bb+VV.vv (1)
19- 25 F7.3 deg RAdeg Clump right ascension (J2000)
27- 32 F6.3 deg DEdeg Clump declination (J2000)
34- 37 F4.1 km/s RV Radial velocity
39- 41 F3.1 km/s DRV Line width
43- 47 F5.1 K.km/s Int Average integrated intensity of the
13CO(3-2) line
49- 53 F5.2 --- tau13 Opacity τ of the 13CO(3-2) line
55- 57 F3.1 pc D Clump diameter
59- 62 F4.1 K Tex Excitation temperature
64- 67 F4.2 10+22cm-2 NH2 H2 column density
69- 72 I4 Msun M Mass estimate (computed with LTE assumption)
74- 76 F3.1 --- alpha Virial parameter (α=M/Mvir)
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Note (1): Clump names are created from the l, b and RV positions of
the individual clump centroid position.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Apr-2013