J/ApJS/252/20 CO survey of the CMa OB1 complex (Lin+, 2021)
A survey of three isotopologues of CO in molecular clouds in the CMa OB1
complex.
Lin+, Lin Z., Sun Y., Xu Ye, Yang Ji, Li Y.
<Astrophys. J. Suppl. Ser., 252, 20 (2021)>
=2021ApJS..252...20L 2021ApJS..252...20L
ADC_Keywords: Molecular clouds; Carbon monoxide; Interstellar medium;
Velocity dispersion; Surveys
Keywords: Jets ; Star formation ; Interstellar molecules
Abstract:
Using the Purple Mountain Observatory 13.7m millimeter telescope at
Delingha in China, we have conducted a large-scale simultaneous survey
of 12CO, 13CO, and C18O (J=1-0) toward the CMa OB1 complex with
a sky coverage of 16.5deg2 (221.5°≤l≤227°,
-2.5°≤b≤0.5°). Emission from the CMa OB1 complex is found in
the range 7km/s≤VLSR≤25km/s. The large-scale structure, physical
properties, and chemical abundances of the molecular clouds are
presented. A total of 83 C18O molecular clumps are identified with
the GaussClumps algorithm within the mapped region. We find that 94%
of these C18O molecular clumps are gravitationally bound. The
relationship between their size and mass indicates that none of the
C18O clumps has the potential to form high-mass stars. Using a
semiautomatic IDL algorithm, we newly discover 85 CO outflow
candidates in the mapped area, including 23 bipolar outflow
candidates. Additionally, a comparative study reveals evidence for a
significant variety of physical properties, evolutionary stages, and
levels of star formation activity in different subregions of the CMa
OB1 complex.
Description:
In this paper, we present a new J=1-0 12CO/13CO/C18O survey
toward the CMa OB1 complex with a sky coverage of 16.5deg2
(221.5°≤l≤227°, -2.5°≤b≤0.5°), which is part of
the ongoing Milky Way Imaging Scroll Painting project (MWISP,
Su+ 2019ApJS..240....9S 2019ApJS..240....9S).
The observations used in this study were conducted during
2017 September - 2018 April using the 13.7m millimeter-wavelength
telescope of the Purple Mountain Observatory in Delingha, China.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 91 83 The physical properties of C18O clumps
tableb1.dat 39 85 Outflow candidates
tablec1.dat 91 108 Physical properties of the outflow candidates
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See also:
VII/20 : Catalogue of HII Regions (Sharpless 1959)
J/A+AS/103/541 : Arcetri Catalogue of H2O Maser Sources (Brand+ 1994)
J/A+AS/132/211 : Interstellar SiO sources (Harju+ 1998)
J/PASJ/56/313 : 13CO survey of Mon & CMa molecular clouds (Kim+, 2004)
J/ApJ/665/1194 : Dense cores in the Orion A cloud survey (Ikeda+, 2007)
J/ApJ/684/1240 : Prestellar cores in Perseus, Serpens & Oph (Enoch+, 2008)
J/MNRAS/418/2121 : CO 3-2 observations of outflows in W5 (Ginsburg+, 2011)
J/ApJ/756/76 : Planck cold dust clumps CO survey (Wu+, 2012)
J/ApJ/772/45 : Hi-GAL: star formation in the 3rd quadrant (Elia+, 2013)
J/MNRAS/431/1752 : ATLASGAL 6.7GHz methanol masers (Urquhart+, 2013)
J/A+A/564/A68 : Orion A GMC 13CO and C18O maps (Shimajiri+, 2014)
J/AJ/147/46 : Properties of clumps in the NAN complex (Zhang+, 2014)
J/ApJS/219/20 : Outflows and bubbles in Taurus (Li+, 2015)
J/ApJ/798/L27 : CO obs. of molecular clouds in the 2nd quadrant (Sun+, 2015)
J/A+A/594/A58 : Hi-GAL l=224deg region CO(1-0) data cubes (Olmi+, 2016)
J/ApJS/224/7 : CO obs. of the outer arm in the 2nd quadrant (Du+, 2016)
J/ApJS/230/17 : CO of MCs in the Extreme Outer Galaxy region (Sun+, 2017)
J/ApJS/235/3 : Outflows associated with ATLASGAL clumps (Yang+, 2018)
J/ApJS/242/19 : CO outflow candidates toward W3/4/5 complex (Li+, 2019)
J/ApJS/240/26 : YSO cand. in Canis Major OB1 association (Sewilo+, 2019)
J/A+A/633/A147 : FQS. Galactic Plane CO survey (Benedettini+, 2020)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name of each clump, as defined by its
central Galactic Coordinates,
GLLL.lll±BB.bbb
17- 21 F5.2 km/s VLSR [9.9/20.7] Central velocity
23- 26 F4.2 km/s dv [0.17/0.8] Clump velocity dispersion
28- 31 F4.2 K TC18O [1.2/3.7] Peak main beam temperature of
the C18O emission peak fitted by
GaussClumps
33- 37 F5.2 K T12CO [3.9/22] Main beam temperature of 12CO
peak within the same area of clumps in
12CO data
39- 43 F5.2 arcmin2 Area [3.4/44] Angular area of each clump,
estimated by GaussClumps
45- 49 F5.2 K Tex [7.2/25.4] Excitation temperature
51- 54 F4.2 --- tau [0.07/0.6] Optical depth
56- 59 F4.2 km/s sigma-T [0.16/0.3] Thermal velocity dispersion
61- 64 F4.2 km/s sigma-NT [0.16/0.8] Non-thermal velocity dispersion
66- 69 F4.2 pc Reff [0.3/1.3] Effective radius
71- 73 I3 Msun MLTE [22/979] LTE mass
75- 77 I3 Msun Mvir [16/540] Virial mass
79- 82 F4.2 --- aVir [0.3/3.7] Virial parameter
84- 91 A8 --- Seq Index of associated outflow candidate
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/85] Outflow index
4- 10 F7.3 deg GLON [222.4/226.6] Central Galactic longitude of
outflow
12- 17 F6.3 deg GLAT [-2.4/-0.2] Central Galactic latitude of outflow
19- 22 F4.1 km/s bw0 [5.8/15.1]? Velocity range, min, of the blue
line wing
24- 27 F4.1 km/s bw1 [7.6/16.8]? Velocity range, max, of the blue
line wing
29- 32 F4.1 km/s rw0 [11.4/22.1]? Velocity range, min, of the red
line wing
34- 37 F4.1 km/s rw1 [14/26.7]? Velocity range, max, of the red line
wing
39 A1 --- Type [BDR] Outflow Type (1)
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Note (1): Type of outflow candidate as follows:
B = blue monopolar outflow candidate (33 occurrences);
R = red monopolar outflow candidate (29 occurrences);
D = bipolar outflow candidate (23 occurrences).
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/85] Index of outflow candidate
4 A1 --- Lobe [BR] Type of lobe candidate, B=Blue; R=Red
6- 12 F7.3 deg GLON [222.4/226.6] Central Galactic longitude
of lobe
14- 19 F6.3 deg GLAT [-2.4/-0.2] Central Galactic latitude of
lobe
21- 25 F5.2 km/s Vpk [8.3/21] Velocity of 12CO peak emission
27- 30 F4.2 --- psi [0.5/0.95] Lowest contour boundary of
each lobe (1)
32- 35 F4.2 arcmin2 Area [1.2/9.5] Angular area of each lobe,
defined by the lowest contour level of
each lobe
37- 41 F5.2 km/s dv-lobe [-7.1/7.3] Velocity, outflow lobe
candidate (2)
43- 46 F4.2 pc l-lobe [0.6/1.9] Length, outflow lobe candidate,
parsecs (2)
48- 55 E8.2 Msun M-lobe [0.03/1.2] Mass, outflow lobe candidate,
solar units (2)
57- 64 E8.2 Msun.km/s Pmom [0.05/5.3] Momentum, outflow lobe
candidate (2)
66- 73 E8.2 10-7J E [1e+40/3.2e+44] Kinetic energy (2)
75- 82 E8.2 yr t [78900/576000] Dynamical timescale (2)
84- 91 E8.2 10-7W Lum [8.8e+28/8.6e+31] Luminosity (2)
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Note (1): Lowest contour boundary of each lobe, ranges from 50% to 95% of
the peak intensity. For the isolated lobes, we use ψ=0.5. If a lobe
candidate suffered from confusion due to adjacent components, then a
higher value of ψ was tested to ensure that the lobe could be
distinguished from the cloud.
Note (2): Velocity, length, mass, momentum, kinetic energy, dynamical
timescale, and luminosity of each outflow candidate derived assuming
Tex=30K.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Apr-2021