J/ApJ/756/76 Planck cold dust clumps CO survey (Wu+, 2012)
Gas emissions in Planck cold dust clumps - A survey of the J=1-0 transitions
of 12CO, 13CO, and C18O.
Wu Y., Liu T., Meng F., Li D., Qin S.-L., Ju B.-G.
<Astrophys. J., 756, 76 (2012)>
=2012ApJ...756...76W 2012ApJ...756...76W
ADC_Keywords: Interstellar medium ; Radio lines ; Molecular clouds
Keywords: dust, extinction - ISM: clouds - ISM: kinematics and dynamics -
ISM: structure - stars: formation - stars: protostars
Abstract:
A survey toward 674 Planck cold clumps of the Early Cold Core
Catalogue (ECC) in the J=1-0 transitions of 12CO, 13CO, and C18O
has been carried out using the Purple Mountain Observatory 13.7m
telescope. Six hundred seventy-three clumps were detected with 12CO
and 13CO emission, and 68% of the sample has C18O emission.
Additional velocity components were also identified. A close
consistency of the three line peak velocities was revealed for the
first time. Kinematic distances are given for all the velocity
components, and half of the clumps are located within 0.5 and 1.5kpc.
Excitation temperatures range from 4 to 27K, slightly larger than
those of Td. Line width analysis shows that the majority of ECC
clumps are low-mass clumps. Ten clumps were mapped. Twelve velocity
components and 22 cores were obtained. Their morphologies include
extended diffuse, dense, isolated, cometary, and filament, of which
the last is the majority. Twenty cores are starless, and only seven
cores seem to be in a gravitationally bound state. Planck cold clumps
are the most quiescent among the samples of weak red IRAS, infrared
dark clouds, UC HII candidates, extended green objects, and methanol
maser sources, suggesting that Planck cold clumps have expanded the
horizon of cold astronomy.
Description:
Using the 13.7m telescope of Qinghai Station of the PMO at De Ling Ha,
the survey toward the ECC clumps with 12CO (1-0) and 13CO (1-0)
lines was carried out from 2011 January to May.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 674 Surveyed Early Cold Core (ECC) catalog
table3.dat 137 938 Observed parameters of the J=1-0 lines of
12CO, 13CO and C18O
table4.dat 92 938 Derived parameters of Surveyed ECC cores
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See also:
VIII/88 : Planck Early Release Compact Source Catalogue (Planck, 2011)
VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)
VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)
VII/20 : Catalogue of HII Regions (Sharpless 1959)
J/ApJS/202/4 : Planck cold clumps survey in the Orion complex (Liu+, 2012)
J/ApJ/710/150 : Molecular lines in EGOs (Chen+, 2010)
J/ApJ/686/384 : 12CO, 13CO, C18O survey of IRDCs (Du+, 2008)
J/MNRAS/391/869 : A mapping survey of massive CO cores (Guan+, 2008)
J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)
J/ApJ/653/1325 : Galactic distribution of infrared dark clouds (Simon+, 2006)
J/ApJS/152/81 : CO survey toward starless cores (Park+, 2004)
J/ApJ/566/945 : Massive star forming regions at 1.2mm (Beuther+, 2002)
J/A+A/380/665 : Massive dense cores with 13CO J=1-0 lines (Wu+, 2001)
J/A+A/308/573 : Ammonia on YSOs IRAS sources (Molinari+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Source name (GLLL.ll+BB.bb)
14 A1 --- f_Name [*] Source excluded in the analysis (1)
16- 26 F11.7 deg GLON Galactic longitude
28- 40 F13.9 deg GLAT Galactic latitude
42- 43 I2 h RAh Hour of Right Ascension (J2000)
45- 46 I2 min RAm Minute of Right Ascension (J2000)
48- 52 F5.2 s RAs Second of Right Ascension (J2000)
54 A1 --- DE- Sign of the Declination (J2000)
55- 56 I2 deg DEd Degree of Declination (J2000)
58- 59 I2 arcmin DEm Arcminute of Declination (J2000)
61- 65 F5.2 arcsec DEs Arcsecond of Declination (J2000)
67- 68 I2 h RABh Hour of Right Ascension (B1950)
70- 71 I2 min RABm Minute of Right Ascension (B1950)
73- 77 F5.2 s RABs Second of Right Ascension (B1950)
79 A1 --- DEB- Sign of the Declination (B1950)
80- 81 I2 deg DEBd Degree of Declination (B1950)
83- 84 I2 arcmin DEBm Arcminute of Declination (B1950)
86- 90 F5.2 arcsec DEBs Arcsecond of Declination (B1950)
92-103 A12 --- Reg Region (2)
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Note (1):
* = No suitable background reference positions for the CO emission
observations and are thus excluded in the analysis.
Note (2): Regions are: 1st Quad 2nd Quad, 3th Quad, 4th Quad,
Anticenter, Aquila South, Cephens, High Glat, Oph-Sgr, Ophiuchus,
Orion, Taurus
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Source name (GLLL.ll+BB.bb)
15- 21 F7.3 km/s V12 ? Local Standard of Rest velocity for 12CO
23- 27 F5.3 km/s e_V12 ? Uncertainty in V12
29- 34 F6.3 km/s W12 ? Full-Width at Half-Maximum for 12CO
36- 40 F5.3 km/s e_W12 ? Uncertainty in W12
42- 48 F7.4 K TA12 ? Antenna temperature for 12CO
50- 53 F4.2 K e_TA12 ? Uncertainty in TA12
55- 61 F7.3 km/s V13 ? Local Standard of Rest velocity for 13CO
63- 67 F5.3 km/s e_V13 ? Uncertainty in V13
69- 73 F5.3 km/s W13 ? Full-Width at Half-Maximum for 13CO
75- 79 F5.3 km/s e_W13 ? Uncertainty in W13
81- 85 F5.3 K TA13 ? Antenna temperature for 13CO
87- 90 F4.2 K e_TA13 ? Uncertainty in TA13
92- 97 F6.2 km/s V18 ? Local Standard of Rest velocity for C18O
99-103 F5.3 km/s e_V18 ? Uncertainty in V18
105-110 F6.3 km/s W18 ? Full-Width at Half-Maximum for C18O
112-116 F5.3 km/s e_W18 ? Uncertainty in W18
118-122 F5.3 K TA18 ? Antenna temperature for C18O
124-127 F4.2 K e_TA18 ? Uncertainty in TA18
129-137 A9 --- Prof Non-Gaussian profile code (1)
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Note (1): Profile code as follows:
BA+ = blue profile;
RA+ = red profile;
BA = blue asymmetric;
RA = red asymmetric;
De = possible depletion;
BW = blue wing;
RW = red wing;
W = wings;
P = pedestal;
Dob = Double components;
T = Three components;
M.B = Multiple or Blended components.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Source name (GLLL.ll+BB.bb)
15- 21 F7.3 km/s V ? Local Standard of Rest velocity of 13CO
23- 27 F5.2 kpc R ? Distance from Galactic center
29- 33 F5.2 kpc D ? Distance
35- 39 F5.2 kpc Z ? Galactic Scale height
41- 44 F4.1 K Tex Excitation temperature
46- 48 F3.1 --- tau13 ? The 13CO optical depth τ(13CO)
50- 53 F4.1 10+15/cm2 N13 The 13CO column density
55- 57 F3.1 --- tau18 ? The C18O optical depth
59- 62 F4.1 10+15/cm2 N18 ? The C18O column density
64- 67 F4.1 10+21/cm2 NH2 ? The H2 column density
69- 72 F4.1 --- 12/13 ? The 12CO/13CO line strength ratio
74- 77 F4.1 --- X13/X18 ? The 13CO/C18O abundance ratio
79- 82 F4.2 km/s sigNT ? 1D non-thermal velocity dispersion
84- 87 F4.2 km/s sigT ? 1D thermal velocity dispersion
89- 92 F4.2 km/s sig3D ? 3D velocity dispersion
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History:
* 10-Oct-2012: from electronic version of the journal
* 04-Dec-2012: table4 record#118
"G058.16+03.50" corrected into "G058.07+03.20"
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2012