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J/ApJ/665/1194      Dense cores in the Orion A cloud survey       (Ikeda+, 2007)

A survey of dense cores in the Orion A cloud. Ikeda N., Sunada K., Kitamura Y. <Astrophys. J., 665, 1194-1219 (2007)> =2007ApJ...665.1194I
ADC_Keywords: Surveys ; Molecular clouds ; Morphology ; Radio lines Keywords: ISM: clouds - ISM: individual (Orion A, M42) - stars: formation Abstract: We have carried out an H13CO+ (J=1-0) core survey in a large area of 1.5degx0.5deg, covering the whole region of the Orion A molecular cloud, using the Nobeyama 45m radio telescope with the 25 Beam Array Receiver System (BEARS). This survey is unique in that a large area (∼48pc2) of the cloud was covered with a high spatial resolution of 21" (0.05pc) and with a deep integration (1sigma∼0.1K in T*A), resulting in a core mass detection of 1.6M. The morphology of the H13CO+ (J=1-0) emission is very similar to that of the 850um continuum emission. We identified 236 dense cores from our data with the clumpfind algorithm. The cores are close to virial equilibrium, independent of whether they are thermal or turbulent. Description: Our observations have been carried out in the H13CO+ (J=1-0) molecular line (86.754GHz) toward the Orion A GMC in the period from 1999 December to 2003 May. All the observations were done with the Nobeyama 45m radio telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 72 236 Physical properties of the H13CO+ cores in the Orion A cloud
See also: J/AJ/109/709 : K survey of Ori A molecular cloud (Ali+ 1995) J/ApJ/653/383 : SCUBA observations in Orion A South region (Johnstone+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [ISK2007] Sequential number 5 I1 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 13 F4.1 s RAs [0/60] Right ascension (J2000) 16 A1 --- DE- Declination sign (J2000) 17 I1 deg DEd Declination (J2000) 19- 20 I2 arcmin DEm Declination (J2000) 22- 23 I2 arcsec DEs Declination (J2000) 25- 28 F4.1 km/s Vlsr LSR velocity 30- 32 F3.1 K Tpeak Peak T*A temperature 34- 36 F3.1 ---- Asp Aspect ratio (a/b) 38- 39 I2 arcsec Rcore Core radius in arcsec (1) 41- 44 F4.2 pc Rpc Core radius in pc 46- 49 F4.2 km/s dVcore Core velocity width (1) 51- 54 F4.1 solMass MLTE LTE core mass (1) 56- 61 F6.2 solMass MVir Virial mass (1) 63- 66 F4.2 --- MVir/LTE Virial-to-LTE mass ratio (1) 68- 72 F5.2 10+4cm-3 n Mean number density of the core (1)
Note (1): The typical uncertainty of each quantity is as: Rcore = 0.04pc, derived from the uncertainty in the estimation of the core projected area dVcore = 0.13km/s, corresponding to the velocity resolution MLTE = a factor of 3 (see text) Mvir = a factor of 3, derived from the uncertainties in Rcore and dvcore Mvir/MLTE = a factor of 4, derived from the uncertainties in MLTE and Mvir n = a factor of 4, derived from the uncertainties in Rcore and MLTE
History: From electronic version of the journal References: Ikeda et al. Paper II. 2009ApJ...691.1560I Cat. J/ApJ/691/1560
(End) Patricia Vannier [CDS] 06-Sep-2009
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