J/A+A/672/A153 CO(2-1) survey at 9pc resolution in SMC (Saldano+, 2023)
CO(2-1) survey at 9 parsec resolution in the Small Magellanic Cloud.
Saldano H.P., Rubio M., Bolatto A.D., Verdugo C., Jameson K.E., Leroy A.K.
<Astron. Astrophys. 672, A153 (2023)>
=2023A&A...672A.153S 2023A&A...672A.153S (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Molecular clouds ; Carbon monoxide ;
Radio sources
Keywords: galaxies: dwarf - galaxies: individual: SMC - ISM: clouds -
ISM: molecules
Abstract:
We present a CO(2-1) survey at 9pc resolution obtained with the APEX
telescope in the Small Magellanic Cloud (SMC). We perform a catalog of
177 molecular clouds in an extensive region (0.4kpc2) of the SMC. We
use the CPROPS algorithm to identify the molecular clouds and estimate
their main CO parameters. We analyze the scaling relations between the
radius, velocity dispersion, luminosity, and virial mass of the SMC
clouds, and they are compared with those of other low-metallicity
galaxies. We also analyze the mass spectrum of the SMC by using the
cumulative mass distribution. We study the dynamic state and stability
of dust clouds associated with CO emission within our observed area.
We estimate the viral mass- and dust-based CO-to-H2 conversion factor
of the SMC. Finally, we study the link between molecular clouds and
star-forming regions.
Description:
Parameters of CO clouds in the SMC are reported. All these parameters,
which were obtained by using CPROPS (Rosolowsky et al.,
2006PASP..118..590R 2006PASP..118..590R), are corrected for bias sensitivity and
resolution. We provide the APEX data cubes used in this article. Seven
regions were observed in the SMC, where the CO emission in the
transition J=2-1 was detected. Four regions (SW-Bar, DarkPK, NE-Bar,
N66) are in the Bar of the SMC, and the other three regions (N83,
NGC 602, N88) are located in the Wing of the galaxy.
Objects:
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RA (2000) DE Designation(s)
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00 46 55.8 -73 14 11.9 SW-Bar
00 52 56.5 -73 12 30.6 DarkPK
01 04 13.6 -71 59 25.2 NE-Bar
00 59 05.9 -72 10 04.6 N66 = LHA 115-N 66A
01 14 29.5 -73 13 26.5 N83 = LHA 115-N 83
01 29 27.1 -73 33 51.2 NGC 602 = NGC 602
01 24 08.5 -73 08 56.6 N88 = LHA 115-N 88
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 94 177 Parameters of CO(2-1) clouds in the SMC
list.dat 124 7 List of fits datacubes
fits/* . 7 Individual fits datacubes
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- N [1/177] Cloud number
5 I1 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 23 I2 arcsec DEs Declination (J2000)
25- 29 F5.1 pc R ? Radius (1)
31- 34 F4.1 pc e_R ? Radius uncertainty
36- 40 F5.1 km/s Vc Peak velocity
42- 44 F3.1 km/s e_Vc Peak velocity uncertainty
46- 48 F3.1 km/s sigma Velocity dispersion
50- 52 F3.1 km/s e_sigma Velocity dispersion uncertainty
54- 56 F3.1 K Tp Peak temperature
58- 60 F3.1 K e_Tp Peak temperature uncertainty
62- 67 F6.1 K.km/s Ico CO(2-1) intensity
69- 72 F4.1 K.km/s e_Ico CO(2-1) intensity uncertainty
74- 77 F4.1 10+2K.km/s.pc2 Lco CO(2-1) luminosity
79- 81 F3.1 10+2K.km/s.pc2 e_Lco CO(2-1) luminosity uncertainty
83- 88 F6.1 10+3Msun Mvir ? Virial mass (1)
90- 94 F5.1 10+3Msun e_Mvir ? Virial mass uncertainty
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Note (1): Undefined values in the R and Mvir columns correspond to unresolved
clouds, i.e., clouds with radii lower than the resolution limit.
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Name of region
8 I1 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 16 F4.1 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 32 I3 --- Nx Number of pixels along X-axis
34- 36 I3 --- Ny Number of pixels along Y-axis
38- 41 I4 --- Nz Number of slices
43- 44 I2 arcsec/pix Size Pixel size
46- 47 I2 arcsec HPBW Final beam width
49- 52 F4.2 km/s dVel Final spectral resolution
54- 58 F5.1 km/s bVel Lower value of velocity interval
60- 64 F5.1 km/s BVel Higher value of velocity interval
66- 70 I5 Kibyte size Size of FITS file
72- 89 A18 --- FileName Name of FITS file, in subdirectory fits
91-124 A34 --- Title Title of the FITS file
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Acknowledgements:
Hugo Saldano, hpablohugo(at)gmail.com
(End) Patricia Vannier [CDS] 13-Jan-2023