J/AJ/165/106 Molecular clouds in section of 3rd galactic quadrant (Wang+, 2023)
The Molecular Clouds in a Section of the Third Galactic Quadrant; Cloud Catalog.
Wang C., Feng H., Yang Ji, Chen X., Su Y., Yan Q.-Z., Du F., Ma Y.,
Cai J.
<Astron. J., 165, 106 (2023)>
=2023AJ....165..106W 2023AJ....165..106W
ADC_Keywords: Molecular clouds; Spectra, millimetric/submm;
Keywords: Molecular gas ; Molecular clouds
Abstract:
We present results of cloud catalogs of 12CO, 13CO, and C18O (J=1-0)
in a section of the third Galactic quadrant over (195°<l<220°,
|b|<5°) from the Milky Way Imaging Scroll Painting project. The
data were acquired with the PMO 13.7m millimeter telescope with ∼50"
angular resolution. We construct three molecular cloud catalogs
containing information of 12CO, 13CO, and C18O from the
position-position-velocity (PPV) data cubes. The 12CO cloud catalog
contains 7069 samples identified based on the DBSCAN algorithm. We
develop a new algorithm, the stacking bump algorithm, for identifying
13CO and C18O emission by searching for weak signals in the original
spectra of 13CO and C18O within the boundary in PPV space defined by
the 12CO cloud. Above the 2σ threshold level, we identified 1197
clouds having 13CO emission and 32 clouds having C18O emission. We
test the stacking bump algorithm in the noise-only datacube and find
that the 2σ threshold can effectively avoid the possibility of
false detection generated by noise. The results proved that the new
algorithm has high accuracy and completeness. Statistics of peak
intensity, projected angular area, line width, and flux of the clouds
show that the power-law indices obtained from different isotopic lines
are close to each other.
Description:
The data were acquired with the Purple Mountain Observatory (PMO)
13.7m millimeter telescope with ∼50" angular resolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 7069 A catalog of all molecular clouds
table2.dat 73 1197 A catalog of molecular clouds which identified with
13CO emission
table3.dat 73 32 A catalog of molecular clouds which identified with
C18O emission
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See also:
VII/20 : Catalogue of HII Regions (Sharpless 1959)
VII/7 : Lynds' Catalogue of Dark Nebulae (LDN) (Lynds 1962)
VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
VII/284 : A Catalogue of Galactic Supernova Remnants (Green, 2019)
J/ApJ/551/852 : FCRAO CO survey of the outer Galaxy (Heyer+, 2001)
J/ApJ/723/492 : Physical properties GRS molecular clouds (Roman-Duval+, 2010)
J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)
J/A+A/588/A104 : Molecular clouds and star formation (Gong+, 2016)
J/ApJ/818/95 : YSO candidates within 5' from the IR bubble N4 (Liu+, 2016)
J/ApJ/910/131 : Molecular gas distribution from MWISP CO survey (Su+, 2021)
J/ApJS/257/51 : Morphological classif. MWISP 12CO mol. clouds (Yuan+, 2021)
J/AJ/163/266 : IGRINS & Gaia; star formation Monoceros OB1 & R1 (Lim+, 2022)
J/ApJS/262/16 : Column density maps for MWISP 13CO mol. clouds (Ma+, 2022)
J/ApJS/261/37 : 13CO emission in MWISP 12CO molecular clouds (Yuan+, 2022)
Byte-by-byte Description of file: table[123].dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- ID Cloud identifier
24- 30 F7.3 deg GLON Galactic longitude (1)
32- 38 F7.3 deg GLAT Galactic latitude (1)
40- 45 F6.2 km/s VLSR Local Standard of Rest velocity (1)
47- 54 F8.2 arcmin2 Area Projected angular cloud area
56- 59 F4.2 km/s dV Average spectrum linewidth from 2nd moment
61- 64 F4.1 K TPeak Peak intensity
66- 73 F8.1 --- Flux Flux of 12CO (table1), 13CO (table2) or
18CO (table3) emission (K*km/s*arcmin2)
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Note (1): Of 12CO channel maximum for table1, of 13CO channel
maximum for table2 and of C18O channel maximum for table3.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 15-Jun-2023