J/A+A/531/A26 Clumps in W31 from CO and 875um observations (Beuther+, 2011)
High-mass star formation at high luminosities: W31 at >106L☉.
Beuther H., Linz H., Henning T., Bik A., Wyrowski F., Schuller F.,
Schilke P., Thorwirth S., Kim K.-T.
<Astron. Astrophys. 531, A26 (2011)>
=2011A&A...531A..26B 2011A&A...531A..26B
ADC_Keywords: Supernova remnants ; Radio lines ; Millimetric/submm sources
Keywords: stars: formation - stars: early-type - stars: individual: W31 -
stars: evolution - stars: massive
Abstract:
High-mass star formation has been a very active field over the past
decade; however, most studies have targeted regions of luminosities
between 104 and 105L☉. In contrast to that, the highest
mass stars reside in clusters exceeding 105 or even 106L☉.
We want to study the physical conditions associated with the formation
of the highest mass stars.
To do this, we selected the W31 star-forming complex with a total
luminosity of ∼6x106L☉ (comprised of at least two subregions)
for a multiwavelength spectral line and continuum study covering
wavelengths from the near- and midinfrared via (sub)mm wavelength
observations to radio data in the cm regime.
Description:
The C18O(2-1) and 13CO(2-1) data at 219.560GHz and 220.399GHz were
observed simultaneously with the Atacama Pathfinder Experiment (APEX1)
in July 2009 in the 1mm band over the entire W31 complex in the
on-the-fly mode. The 875um images are from the ATLASGAL survey of
the Galaxy (Schuller et al. 2009A&A...504..415S 2009A&A...504..415S)
Objects:
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RA (2000) DE Designation(s)
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18 10 28.6 -19 55 51 W31 = SNR G010.2-00.3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 73 Clump parameters for original data
table2.dat 84 44 Clump parameters for 27.5" resolution
list.dat 88 6 FITS images and maps list
images/* . 6 FITS images and maps
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/79] Clump number
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10- 14 F5.2 s RAs Right ascension (J2000.0)
16 A1 --- DE- Declination sign (J2000.0)
17- 18 I2 deg DEd Declination (J2000.0)
20- 21 I2 arcmin DEm Declination (J2000.0)
23- 26 F4.1 arcsec DEs Declination (J2000.0)
28- 31 F4.2 Jy F875 875um peak flux (in Jy/beam)
33- 37 F5.2 Jy I875 875um integrated flux
39- 41 F3.1 pc r Effective linear radius of 875um clump
43- 46 F4.1 10+22cm-2 NH2 H2 column density from 875um data
48- 51 I4 Msun M875 H2 mass from 875um data
53- 55 F3.1 K Tco ? C18O(2-1) peak temperature
57- 60 F4.1 K.km/s Ico ? C18O(2-1) integrated intensity
62- 65 F4.1 km/s Vco ? C18O(2-1) peak velocity
67- 69 F3.1 km/s Wco ? C18O(2-1) linewidth
71- 74 F4.1 10+22cm-2 NH2co ? H2 column density from C18O(2-1) data
76- 79 I4 Msun Mco ? H2 mass from C18O(2-1) data
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/44] Clump number
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10- 14 F5.2 s RAs Right ascension (J2000.0)
16 A1 --- DE- Declination sign (J2000.0)
17- 18 I2 deg DEd Declination (J2000.0)
20- 21 I2 arcmin DEm Declination (J2000.0)
23- 26 F4.1 arcsec DEs Declination (J2000.0)
28- 32 F5.2 Jy F875 875um peak flux (in Jy/beam)
34- 38 F5.2 Jy I875 875um integrated flux
40- 42 F3.1 pc r Effective linear radius of 875um clumps
44- 47 F4.1 10+22cm-2 NH2 H2 column density from 875um data
49- 52 I4 Msun M875 H2 mass from 875um total clump fluxes
54- 57 I4 Msun M875p H2 mass from 875um peak fluxes
59- 61 F3.1 K Tco ? C18O(2-1) peak temperature
63- 66 F4.1 K.km/s Ico ? C18O(2-1) integrated intensity
68- 71 F4.1 km/s Vco ? C18O(2-1) peak velocity
73- 75 F3.1 km/s Wco ? C18O(2-1) linewidth
77- 79 F3.1 10+22cm-2 NH2co ? H2 column density from C18O(2-1) data
81- 84 I4 Msun Mco ? H2 mass from C18O(2-1) data
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- FileName Name of the FITS file in subdirectory images
13- 21 F9.5 deg RAdeg Right ascension (J2000) of field center
22- 30 F9.5 deg DEdeg Declination (J2000) of field center
32- 35 F4.1 arcsec/pix scale Image scale (size of 1pixel)
37- 88 A52 --- Title Title of the image
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Acknowledgements:
Henrik Beuther, beuther(at)mpia-hd.mpg.de
(End) Patricia Vannier [CDS] 10-May-2011