J/ApJS/178/302 C18O observations of multiple-core systems (Saito+, 2008)
High-resolution studies of the multiple-core systems toward cluster-forming
regions including massive stars.
Saito H., Saito M., Yonekura Y., Nakamura F.
<Astrophys. J. Suppl. Ser. 178, 302-329 (2008)>
=2008ApJS..178..302S 2008ApJS..178..302S
ADC_Keywords: Interstellar medium ; Millimetric/submm sources
Keywords: ISM: clouds - ISM: molecules - ISM: structure - stars: formation
open clusters and associations: general - stars: early-type
Abstract:
We present the results of C18O observations by the Nobeyama
Millimeter Array toward dense clumps with radii of ∼0.3pc in six
cluster-forming regions including massive (proto) stars. We identified
171 cores, whose radius, line width, and molecular mass range from
0.01 to 0.09pc, 0.43 to 3.33km/s, and 0.5 to 54.1M☉,
respectively. Many cores with various line widths exist in one clump,
and the index of the line width-radius relationship of the cores and
the parental clump differs from core to core in the clump. This
indicates that the degree of dissipation of the turbulent motion
varies for each core in one clump.
Description:
The observations were carried out from 2002 November through 2005 May
with the six-element Nobeyama Millimeter Array (NMA) in the C18O
(J=1-0 ; 109.782GHz) line and 98110GHz continuum bands.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 67 182 Observed properties of C18O cores
table5.dat 64 171 Derived properties of C18O cores
--------------------------------------------------------------------------------
See also:
J/MNRAS/391/869 : A mapping survey of massive CO cores (Guan+, 2008)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Region Source region
16- 19 A4 --- --- [core]
21- 22 A2 --- Core Core identification (G1)
24- 25 I2 h RAh ? Hour of Right Ascension (J2000) (1)
27- 28 I2 min RAm ? Minute of Right Ascension (J2000)(1)
30- 33 F4.1 s RAs ? Second of Right Ascension (J2000) (1)
34 A1 --- DE- Declination sign (J2000) (1)
35- 36 I2 deg DEd ? Degree of Declination (J2000) (1)
38- 39 I2 arcmin DEm ? Arcminute of Declination (J2000) (1)
41- 42 I2 arcsec DEs ? Arcsecond of Declination (J2000) (1)
44- 46 F3.1 K T*R Absolute peak temperature (2)
48- 52 F5.1 km/s VLSR Local Standard of Rest radial velocity (2)
54- 57 F4.2 km/s dV Full-Width at Half-Maximum of line (2)
59- 62 F4.2 km/s dVc ? Composite line width (3)
64- 67 F4.1 K.km/s intT*R Integrated intensity peak
--------------------------------------------------------------------------------
Note (1): Position of the integrated intensity peak of C18O cores.
Note (2): The parameters are derived from a Gaussian fitting for the line
profile at the integrated intensity peak of C18O cores.
Note (3): The line width of composite spectrum made using the data within
the cores.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Region Source region
16- 17 I2 K Tex Excitation temperature
19- 22 A4 --- --- [core]
24- 25 A2 --- Core Core identification (G1)
27- 30 F4.1 10+22cm-2 N(H2) H2 column density (1)
32- 36 F5.3 pc Rcore Core radius
38- 41 F4.1 solMass Mcore LTE core mass
43- 47 F5.1 solMass Mvir ? Core virial mass
49 A1 --- f_Mvir [e] Mvir not estimated (2)
51- 54 F4.1 10+5cm-3 n(H2)c ? Average H2 density over core
56 A1 --- f_n(H2)c [e] n(H2)c not estimated (2)
58 A1 --- MCS Name of associated millimeter continuum source
60 A1 --- NIR Number of associated 2MASS source
62 A1 --- f_NIR [f] foreground source (3)
64 A1 --- CCS Number of associated centimeter continuum
source
--------------------------------------------------------------------------------
Note (1): at the intensity peak of cores.
Note (2): 'e' when values not derived since the radius has a large error.
Note (3): 'f' when source seems to be foreground (see text).
--------------------------------------------------------------------------------
Global notes:
Note (G1): Sources identified as [SSY2008] IRAS HHMMm+DDMM Core AA in Simbad.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jul-2009