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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 236 Physical properties of the H13CO+ cores in
the Orion A cloud
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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
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Bytes Format Units Label Explanations
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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)
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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
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History:
From electronic version of the journal
References:
Ikeda et al. Paper II. 2009ApJ...691.1560I 2009ApJ...691.1560I Cat. J/ApJ/691/1560
(End) Patricia Vannier [CDS] 06-Sep-2009