J/ApJS/268/1 CO obs. of molecular clouds in the 3rd Gal. quadrant (Dong+, 2023)
Distributions and physical properties of molecular clouds in the third
Galactic quadrant: l=[219.75°,229.75°] and b=[-5.25°,5.25°].
Dong Y., Sun Y., Xu Ye, Lin Z., Bian S., Hao C., Liu D., Li Y., Yang Ji,
Su Y., Zhou X., Zhang S., Yan Q.-Z., Chen Z.
<Astrophys. J. Suppl. Ser., 268, 1 (2023)>
=2023ApJS..268....1D 2023ApJS..268....1D
ADC_Keywords: Molecular clouds; Carbon monoxide; Milky Way; Space velocities;
Millimetric/submm sources
Keywords: Interstellar molecules ; CO line emission ; Molecular clouds ;
Spiral arms
Abstract:
We present the results of an unbiased 12CO/13CO/C18O (J=1-0) survey in
a portion of the third Galactic quadrant (TGQ):
219.75°≤l≤229.75° and -5.25°≤b≤5.25°. The
high-resolution and high-sensitivity data sets help to unravel the
distributions and physical properties of the molecular clouds (MCs) in
the mapped area. In the LSR velocity range from ~-1 to ∼85km/s, the
molecular material successfully traces the Local, Perseus, and Outer
arms. In the TGQ, the Outer arm appears to be more prominent than that
in the second Galactic quadrant (SGQ), but the Perseus arm is not as
conspicuous as that in the SGQ. A total of 1502 12CO, 570 13CO,
and 53 C18O molecular structures are identified, spanning over
∼2 and ∼6 orders of magnitude in size and mass, respectively. Tight
mass-radius correlations and virial parameter-mass anticorrelations
are observable. Yet, it seems that no clear correlations between
velocity dispersion and effective radius can be found over the full
dynamic range. The vertical distribution of the MCs renders evident
pictures of the Galactic warp and flare.
Description:
In this paper, we present the results of the ongoing Milky Way Imaging
Scroll Painting (MWISP) project 12CO/13CO/C18O (J=1-0) survey
toward the G220 region.
The 12CO, 13CO and C18O observations were conducted from
2016 December to 2021 April, by using the Purple Mountain Observatory
(PMO) 13.7m millimeter-wavelength telescope in Delingha, China.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 132 2125 Physical properties of molecular structures
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See also:
VII/50 : CO Radial Velocities Toward Galactic H II Regions (Blitz+ 1982)
VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)
J/A+A/327/325 : Distances of molecular cloud (May+, 1997)
J/A+AS/127/181 : H2O maser sources new detections (Han+ 1998)
J/A+A/368/845 : Arcetri Cat. of H2O maser sources (Valdettaro+, 2001)
J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)
J/PASJ/56/313 : 13CO survey of Mon & CMa molecular clouds (Kim+, 2004)
J/PASJ/59/1185 : Water maser in galactic IRAS sources (Sunada+, 2007)
J/ApJ/672/930 : Distant CO clouds in 3rd Galactic quadrant (Vazquez+, 2008)
J/ApJ/723/492 : GRS molecular clouds (Roman-Duval+, 2010)
J/MNRAS/418/1689 : Red MSX water maser and ammonia emissions (Urquhart+, 2011)
J/ApJ/772/45 : Hi-GAL obs.: star formation in 3rd quadrant (Elia+, 2013)
J/MNRAS/431/1752 : ATLASGAL 6.7GHz methanol masers (Urquhart+, 2013)
J/MNRAS/435/400 : ATLASGAL. Compact HII regions (Urquhart+, 2013)
J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)
J/A+A/584/A92 : Gal. Cold Cores. IV. Cold sub-mm sources (Montillaud+, 2015)
J/A+A/594/A58 : Hi-GAL l=224deg region CO(1-0) data cubes (Olmi+, 2016)
J/A+A/594/A28 : Planck Cat. of Galactic cold clumps (PGCC) (Planck+, 2016)
J/ApJ/834/57 : MW molecular clouds from 12CO (Miville-Deschenes+, 2017)
J/ApJ/885/131 : ∼200 high-mass SFR plx & PM with VLBI (Reid+, 2019)
J/A+A/633/A147 : FQS. Galactic Plane CO survey (Benedettini+, 2020)
J/ApJS/251/26 : CO outflow cand. toward W3/4/5 complex. II. (Li+, 2020)
J/A+A/654/A144 : 13CO (1-0) data molecular cloud cat. (Benedettini+, 2021)
J/ApJS/252/20 : CO survey of the CMa OB1 complex (Lin+, 2021)
J/ApJS/254/3 : CO obs. of molecular clouds in the MW midplane (Ma+, 2021)
J/ApJS/261/37 : 13CO emission in MWISP 12CO mol. clouds (Yuan+, 2022)
http://www.radioast.nsdc.cn/mwisp.php : MWISP home page
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/2125] Running sequence number
6- 10 A5 --- --- [MWISP]
12- 25 A14 --- MWISP MWISP project source identifier (1)
27- 31 F5.2 km/s Vlsr [-1.2/85] Average LSR velocity
33- 36 F4.2 km/s e_Vlsr [0.09/2.3] Velocity dispersion
38- 44 F7.3 deg GLON [219.7/230] Galactic Longitude
46- 50 F5.3 deg e_GLON [0.003/1.1] Galactic Longitude dispersion
52- 57 F6.3 deg GLAT [-5.3/5.3] Galactic Latitude
59- 63 F5.3 deg e_GLAT [0.004/0.7] Galactic Latitude dispersion
65- 68 F4.1 K.km/s WCO [0.2/12]? Average integrated intensity across
area of cloud
70- 73 F4.1 K Tpeak [1/33]? Peak main-beam brightness temperature
75- 78 F4.2 kpc Dist [0.2/9.7] Heliocentric distance (2)
80- 83 F4.1 pc Rad [0/28]? Effective radius
85- 90 F6.1 pc2 Area [0/2445]? Area
92- 99 F8.1 Msun Mass [0/104464]? Mass (3)
101- 105 F5.1 Msun/pc2 sigma [1.4/149]? Mass surface density
107- 114 F8.1 Msun Mvir [0.6/118542]? Virial mass
116- 120 F5.1 --- alpha [0.3/395]? Virial parameter
122- 124 A3 --- Arm Spiral arm (4)
126- 127 I2 --- Flag [12/18] Emission line (5)
129- 132 I4 --- 12CO [4/1498]? Matching 12CO structure index (6)
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Note (1): Galactic coordinates of the structure centroid.
Note (2): Distance determined by referring to the literature for structures
in the Local arm. Kinematic distance estimated by the fit A5
parameters of Reid+ 2019, J/ApJ/885/131 for structures in the Perseus
and Outer arms.
Note (3): Derived by the X-factor method for 12CO structures, and by
the LTE method for 13CO and C18O structures.
Note (4): Loc, Per, and Out mean the Local, Perseus, and Outer arms,
respectively.
Note (5): The 12, 13, and 18 denote structures traced (and their
physical properties estimated) by 12CO, 13CO, and C18O (1-0) lines,
respectively.
Note (6): Index of matching 12CO molecular structure for 13CO and
C18O structures.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Nov-2023