J/ApJS/217/7 Orion A dense cores based on 1.1mm and C18O (Shimajiri+, 2015)
Catalog of dense cores in the Orion A giant molecular cloud.
Shimajiri Y., Kitamura Y., Nakamura F., Momose M., Saito M., Tsukagoshi T.,
Hiramatsu M., Shimoikura T., Dobashi K., Hara C., Kawabe R.
<Astrophys. J. Suppl. Ser., 217, 7 (2015)>
=2015ApJS..217....7S 2015ApJS..217....7S
ADC_Keywords: Molecular clouds ; Millimetric/submm sources ; Interstellar medium
Keywords: catalogs; ISM: individual objects (Orion-A GMC)
Abstract:
We present Orion A giant molecular cloud core catalogs, which are
based on a 1.1mm map with an angular resolution of 36" (∼0.07pc) and
C18O (J=1-0) data with an angular resolution of 26.4" (∼0.05pc). We
have cataloged 619 dust cores in the 1.1mm map using the Clumpfind
method. The ranges of the radius, mass, and density of these cores are
estimated to be 0.01-0.20pc, 0.6-1.2x102M☉ , and
0.3x104-9.2x106cm-3, respectively. We have identified 235 cores
from the C18O data. The ranges of the radius, velocity width, LTE
mass, and density are 0.13-0.34pc, 0.31-1.31km/s, 1.0-61.8M☉ ,
and (0.8-17.5)x103cm-3, respectively. From the comparison of the
spatial distributions between the dust and C18O cores, four types of
spatial relations were revealed: (1) the peak positions of the dust
and C18O cores agree with each other (32.4% of the C18O cores),
(2) two or more C18O cores are distributed around the peak position
of one dust core (10.8% of the C18O cores), (3) 56.8% of the C18O
cores are not associated with any dust cores, and (4) 69.3% of the
dust cores are not associated with any C18O cores.
Description:
The 1.1mm dust continuum and C18O emission data are from Shimajiri
et al. (2011PASJ...63..105S 2011PASJ...63..105S) and Shimajiri et al. (2014, J/A+A/564/A68),
respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 154 619 Identified AzTEC 1.1mm dust cores
table4.dat 111 235 Identified C18O cores
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See also:
VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)
J/A+A/564/A68 : Orion A GMC 13CO and C18O maps (Shimajiri+, 2014)
J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSOs (Megeath+, 2012)
J/ApJS/202/4 : Planck cold clumps survey in the Orion complex (Liu+, 2012)
J/ApJ/732/101 : C18O cores in the S140 cloud (Ikeda+, 2011)
J/A+A/496/153 : Molecular hydrogen flows along Ori A cloud (Davis+, 2009)
J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008)
J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)
J/ApJ/665/1194 : Dense cores in the Orion A cloud survey (Ikeda+, 2007)
J/ApJ/655/351 : Massive quiescent cores in Orion. II. (Li+, 2007)
J/ApJ/653/383 : SCUBA obs. in Orion A South region (Johnstone+, 2006)
J/ApJ/639/259 : Submm clumps in Orion B South cloud (Johnstone+, 2006)
http://th.nao.ac.jp/MEMBER/nakamrfm/sflegacy/sflegacy.html : NRO star
formation project home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/619] AzTEC-Ori Core identification
5- 6 I2 h RAh [5] Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 14 F4.1 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- [-] Sign of the Declination (J2000)
17 I1 deg DEd [4/6] Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 25 F4.1 arcsec DEs Arcsecond of Declination (J2000)
27- 30 F4.2 Jy Flux [0.05/6] Peak 1.1mm flux density in Jy per beam
32- 34 F3.1 --- Asp [1/3] 1.1mm Core aspect ratio (elongation): a/b
36- 39 F4.2 pc Rpc [0.01/0.2] 1.1mm Core radius (1)
41- 45 F5.1 Msun M(H2) [0.6/117] 1.1mm Core mass (1)
47- 51 F5.1 10+4cm-3 n [0.3/915] 1.1mm Mean number density of the core
53 A1 --- Cat [ABD] 1.1mm to C18O core association (G1)
55- 62 A8 --- --- [C18O-Ori]
64- 76 A13 --- C18O Name of associated C18O-Ori core(s) (Table 4)
78-154 A77 --- Notes Source notes (2)
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Note (1): Distance of the cloud is D=400pc.
The mass is derived from Flux column using Eq. (1) and
assuming κ=0.1cm2/g and Tdust=20K.
Note (2): Cross-references (protostar and PMS star associations using the
Spitzer catalog of Megeath et al. 2012 J/AJ/144/192;
<[MGM2012] NNNN> in Simbad):
[NW2007] # = SCUBA 850micron dust core Nutter & Ward-Thompson
(2007, Cat. J/MNRAS/374/1413;
<[NW2007] OrionA{NS}-HHMMSSs-DMMSS> in Simbad)
[ISK2007] # = H13CO+ (1-0) core Ikeda et al. (2007, Cat. J/ApJ/665/1194I;
<[ISK2007] NNN> in Simbad)
[TKU2008] # = N2H+ (1-0) core Tatematsu et al. (2008PASJ...60..407T 2008PASJ...60..407T;
<[TKU2008] Core NN> in Simbad)
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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- 3 I3 --- Seq [1/235] C18O-Ori Core identification
5- 6 I2 h RAh [5] Hour of Right Ascension (J2000)
8- 9 I2 min RAm [33/36] Minute of Right Ascension (J2000)
11- 14 F4.1 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- [-] Sign of the Declination (J2000)
17 I1 deg DEd [4/5] Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 25 F4.1 arcsec DEs Arcsecond of Declination (J2000)
27- 30 F4.1 km/s Vlsr [5.6/12.7] LSR Velocity VLSR
32- 34 F3.1 K TA [0.7/6.3] Peak Antenna Temperature Tpeak
36- 38 F3.1 --- Asp [1/2.2] 1.1mm Core aspect ratio; a/b
40- 43 F4.2 pc Rpc [0.1/0.4] Core radius (distance D=400pc)
45- 48 F4.2 km/s dVc [0.3/1.4] Velocity width in FWHM dVcore
50- 53 F4.2 km/s sigma [0.1/0.6] 1D velocity dispersion σ
within the core
55- 58 F4.1 Msun M(LTE) [1/62] LTE Mass MLTE
60- 64 F5.1 Msun M(VIR) [3/102] Virial Mass MVIR
66- 69 F4.1 --- Rvir [0.4/20.1] Ratio virial mass/LTE mass (Rvir)
71- 74 F4.1 Msun M(J) [0.2/55.6] Jeans Mass MJ
76- 78 F3.1 Msun M(Phi) [0.1/0.8] Maximum Mass MΦ
80- 83 F4.1 --- Rc [0.1/20.8] Critical Mass Ratio Rc
85- 87 F3.1 10-4cm-3 n [0.1/1.8] Mean gas density of the C18O core
89- 95 A7 --- Region Cloud Region (see Figure 1)
97 A1 --- Cat [A-C] C18O to 1.1mm core association (G1)
99-107 A9 --- --- [AzTEC-Ori-]
109-111 I3 --- AzTEC [1/619]? Name of associated AzTEC-Ori mm core
(Table 2)
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Global notes:
Note (G1): Core association as follows:
A = Peak positions of the 1.1mm dust and C18O cores agree with each
other within the 1.1mm map resolution of 36 arcsec.
B = Several C18O cores are distributed around the peak positions of
the 1.1mm dust cores within the 1.1mm map resolution of 36 arcsec.
C = C18O cores not associated with any 1.1mm dust cores.
D = 1.1mm dust cores not associated with any C18O cores.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Apr-2015