J/ApJS/247/29 CO obs. of Planck Galactic cold clumps (Zhang+, 2020) ================================================================================ Planck Galactic cold clumps in two regions: the first quadrant and the anticenter direction region. Zhang C., Wu Y., Liu X., Qin S.-L., Liu T., Yuan J., Li D., Meng F., Zhang T., Tang M., Yuan L., Zhou C., Esimbek J., Zhou Y., Chen P., Hu R. =2020ApJS..247...29Z ================================================================================ ADC_Keywords: Interstellar medium; Millimetric/submm sources; Molecular clouds; Carbon monoxide; Star Forming Region; Velocity dispersion Keywords: Dark interstellar clouds ; Interstellar molecules ; Star formation Abstract: Sixty-five Planck Galactic cold clumps (PGCCs) from the first quadrant (IQuad) and 39 from the anticenter direction region (ACent) were observed in ^12^CO, ^13^CO, and C^18^O J=1-0 lines using the 13.7m telescope of the Purple Mountain Observatory. All the targets were detected in all three lines, except for 12 IQuad and 8 ACent PGCCs without C^18^O detection. Seventy-six and 49 velocity components were obtained in IQuad and ACent respectively; 146 cores were extracted from 76 IQuad clumps and 100 cores from 49 ACent clumps. The average Tex of IQuad cores and ACent cores is 12.4K and 12.1K, respectively. The average line widths of ^13^CO of IQuad cores and ACent cores are 1.55km/s and 1.77km/s, respectively. Among the detected cores, 24 in IQuad and 13 in ACent have asymmetric line profiles. The small blue excesses, ~0.03 in IQuad and 0.01 in ACent, indicate that star formation is not active in these PGCC cores. Power-law fittings of the core mass function to the high-mass end give indices of -0.57 in IQuad and -1.02 in ACent, which are flatter than the slope of the initial mass function given by Salpeter. The large turnover masses of 28M_{sun}_ for IQuad cores and 77M_{sun}_ for ACent cores suggest low star formation efficiencies in PGCCs. The correlation between virial mass and gas mass indicates that most PGCC cores in both regions are not likely pressure-confined. Description: The sample in this paper is a subset of 674 Planck Galactic cold clumps (PGCCs) observed by Wu+ (2012 J/ApJ/756/76) located in the first quadrant (IQuad) and the anticenter direction region (ACent), selected from the Early Cold Cores (ECC) catalog (Planck Collaboration, 2011, VIII/88). Observations of the 65 IQuad PGCCs and 39 ACent PGCCs were carried out with the 13.7m millimeter-wavelength telescope of the Purple Mountain Observatory (PMO) in the J=1-0 transition of ^12^CO, ^13^CO, and C^18^O from 2011 April to May and from 2011 December to 2012 January. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 112 104 Sample of Planck Galactic cold clumps (PGCCs) table2.dat 127 246 Line parameters of core centers table4.dat 79 246 Derived parameters at the core center table6.dat 68 246 Emission region parameters table9.dat 28 58 *Fifty-eight cores associated with objects -------------------------------------------------------------------------------- Note on table9.dat: We have matched clumps with the Class I/II YSO candidates and the Class III YSO candidates from Marton+ 2016, J/MNRAS/458/3479 and IRAS point source catalog (Helou & Walker 1988, II/125). An objects is believed to be associated with a core if it has an offset to the core center of less than a beam size (~1') and a distance (if we can get it from the catalogs) similar to the core. See Section 4.5.3. -------------------------------------------------------------------------------- See also: II/125 : IRAS cat. of Point Sources, Version 2.0 (IPAC 1986) VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987) II/249 : WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003) J/ApJ/428/693 : Rosette Nebula & Maddalena Cloud structures (Williams+ 1994) J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999) J/A+A/462/L17 : Dense cores in interstellar molecular clouds (Alves+, 2007) J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007) J/MNRAS/391/869 : A mapping survey of massive CO cores (Guan+, 2008) J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008) J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009) J/ApJ/691/1560 : Dense core survey in the Orion B cloud (Ikeda+, 2009) J/ApJ/712/797 : YSOs in Vul OB1 association (Billot+, 2010) J/ApJS/202/4 : Planck cold clumps survey in the Orion complex (Liu+, 2012) J/ApJ/756/76 : Planck cold dust clumps CO survey (Wu+, 2012) J/ApJS/209/37 : Planck cold clumps in ^12^CO, ^13^CO & C^18^O (Meng+, 2013) J/ApJ/794/124 : NGC 2264 Spitzer sources (Rapson+, 2014) J/A+A/584/A93 : Galactic cold cores. V. Dust opacity (Juvela+, 2015) J/A+A/584/A91 : Dense cores in Aquila from Herschel (Konyves+, 2015) J/MNRAS/458/3027 : Young and embedded clusters in Cygnus-X (Maia+, 2016) J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016) J/A+A/594/A28 : Planck Cat. of Galactic cold clumps (PGCC) (Planck+, 2016) J/MNRAS/463/1008 : LDN 1495 SCUBA-2 and Herschel data (Ward-Thompson+, 2016) J/ApJ/820/37 : HCO+ & HCN obs. toward PGCCs (Yuan+, 2016) J/ApJS/224/43 : Planck cold clumps & cores in 2nd quadrant (Zhang+, 2016) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- Quad Quadrant ("IQuad": first Galactic quadrant or "ACent": Galactic anti-center direction region) 7- 19 A13 --- Clump Clump 21- 30 F10.6 deg GLON [13.86/226.81] Galactic longitude 32- 42 F11.8 deg GLAT [-9.7/10.81] Galactic latitude 44- 45 I2 h RAh [5/22] Hour of Right Ascension (J2000) 47- 48 I2 min RAm Minute of Right Ascension (J2000) 50- 54 F5.2 s RAs Second of Right Ascension (J2000) 56- 56 A1 --- DE- Sign of the Declination (J2000) 57- 58 I2 deg DEd Degree of Declination (J2000) 60- 61 I2 arcmin DEm Arcminute of Declination (J2000) 63- 67 F5.2 arcsec DEs Arcsecond of Declination (J2000) 69- 70 I2 h RABh [5/22] Hour of Right Ascension (B1950) 72- 73 I2 min RABm Minute of Right Ascension (B1950) 75- 79 F5.2 s RABs Second of Right Ascension (B1950) 81- 81 A1 --- DEB- Sign of the Declination (B1950) 82- 83 I2 deg DEBd Degree of Declination (B1950) 85- 86 I2 arcmin DEBm Arcminute of Declination (B1950) 88- 92 F5.2 arcsec DEBs Arcsecond of Declination (B1950) 94-104 A11 --- Region Sub-region (1) 106-112 A7 --- OB OB association (2) -------------------------------------------------------------------------------- Note (1): The limits of the sub-regions are from Dame+ (1987, VIII/39) and Humphreys (1978ApJS...38..309H). Note (2): The limits of the OB associations are from Humphreys (1978ApJS...38..309H). -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Clump Clump 14 A1 --- m_Clump [a-d] Component identifier in Clump 15- 16 A2 --- Core [C1-5] Core identifier in Clump 18- 21 F4.2 kpc Dist [0.2/9.2]? Distance 23- 27 F5.2 K Tb-12CO [3.9/19.1] ^12^CO brightness temperature 29- 32 F4.2 K e_Tb-12CO [0.07/2.8] Uncertainty in Tb-12CO 34- 38 F5.2 km/s Vlsr-12CO [-7.5/46.2] LSR (centroid) velocity, ^12^CO 40- 43 F4.2 km/s e_Vlsr-12CO [0.01/0.2] Uncertainty in Vlsr-12CO 45- 48 F4.2 km/s dV-12CO [0.6/6.5] Line width, FWHM, ^12^CO 50- 53 F4.2 km/s e_dV-12CO [0.01/0.4] Uncertainty in dV-12CO 55- 58 F4.2 K Tb-13CO [0.6/9.4] ^13^CO brightness temperature 60- 63 F4.2 K e_Tb-13CO [0.05/1.3] Uncertainty in Tb-13CO 65- 69 F5.2 km/s Vlsr-13CO [-7.3/46.3] LSR (centroid) velocity, ^13^CO 71- 74 F4.2 km/s e_Vlsr-13CO [0/0.2] Uncertainty in Vlsr-13CO 76- 79 F4.2 km/s dV-13CO [0.4/5.2] Line width, FWHM, ^13^CO 81- 84 F4.2 km/s e_dV-13CO [0.01/0.4] Uncertainty in dV-13CO 86- 89 F4.2 K Tb-C18O [0.3/3.4]? C^18^O brightness temperature 91- 94 F4.2 K e_Tb-C18O [0.06/6.6]? Uncertainty in Tb-C18O 96-100 F5.2 km/s Vlsr-C18O [-5.6/29.1]? LSR (centroid) velocity, C^18^O 102-105 F4.2 km/s e_Vlsr-C18O [0.01/0.3]? Uncertainty in Vlsr-C18O 107-110 F4.2 km/s dV-C18O [0.17/4]? Line width, FWHM, C^18^O 112-115 F4.2 km/s e_dV-C18O [0.02/0.8]? Uncertainty in dV-C18O 117-121 F5.2 km/s V-peak [-7.3/48] Peak velocity, ^12^CO 123-127 A5 --- Profile Profile (1) -------------------------------------------------------------------------------- Note (1): Profiles as follows: RA = red asymmetry; BA = blue asymmetry; RP = red profile; BP = blue profile; wings = wings. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Clump Clump 14 A1 --- m_Clump [a-d] Component identifier in Clump 15- 16 A2 --- Core [C1-5] Core identifier in Clump 18- 22 F5.2 K Tex [7.2/22.5] Excitation temperature 24- 27 F4.2 K e_Tex [1/1.1] Uncertainty in Tex 29- 32 F4.2 --- tau-13CO [0.07/3.8] optical depth, ^13^CO 34- 37 F4.2 --- e_tau-13CO [0.01/3.2] Uncertainty in tau-13CO 39- 43 F5.2 10+21cm-1 NH2 [0.5/68.7] H_2_ column density 45- 49 F5.2 10+21cm-1 e_NH2 [0.2/26.7] Uncertainty in NH2 51- 54 F4.2 km/s sigma-NT [0.1/2.2] Non-thermal velocity dispersion, {sigma}_NT_ 56- 59 F4.2 km/s e_sigma-NT [0.01/0.07] Uncertainty in sigma-NT 61- 64 F4.2 km/s sigma-Th [0.1/0.3] Thermal velocity dispersion, {sigma}_Th_ 66- 69 F4.2 km/s e_sigma-Th [0.01] Uncertainty in sigma-Th 71- 74 F4.2 km/s sigma-3D [0.4/4] Three-dimensional velocity dispersion, {sigma}_3D_ 76- 79 F4.2 km/s e_sigma-3D [0.01/0.2] Uncertainty in sigma-3D -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Clump Clump 14 A1 --- m_Clump [a-d] Component identifier in Clump 15- 16 A2 --- Core [C1-5] Core identifier in Clump 18- 21 I4 arcsec oRA [-396/361] Offset, Right Ascension 23- 26 I4 arcsec oDE [-385/355] Offset, Declination 28- 30 I3 arcsec amaj [99/435] semi-major axis, Gaussian fit 32- 34 I3 arcsec bmin [60/300] semi-minor axis, Gaussian fit 36- 39 F4.2 pc Rad [0.04/2.94] Radius 41- 45 F5.2 10+3cm-3 n3 [0.34/21.65] Volume particle density 47- 52 F6.1 Msun Mcore [0.1/7612.8] Core mass 54- 57 I4 Msun Mvir [3/3300] Virial mass 59- 62 I4 Msun MJeans [4/3121] Jeans mass 64- 68 F5.2 --- aVir [0.16/52.51] Virial parameter, {alpha} -------------------------------------------------------------------------------- Byte-by-byte Description of file: table9.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- Quad Quadrant ("IQuad": first Galactic quadrant or "ACent": Galactic anti-center direction region) 7- 19 A13 --- Clump Clump 20 A1 --- m_Clump [abd] Component identifier in Clump 21- 22 A2 --- Core [C1-5] Core identifier in Clump 24 I1 --- I/II Class I/II YSO candidate 26 I1 --- III Class III YSO candidate 28 I1 --- IRAS IRAS point source -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Jun-2020