J/A+A/641/A24 ALMA datacubes of 6 nearby galaxies (Wang+, 2020)
Influence of velocity dispersions on star formation activities in galaxies.
Wang T.-M., Hwang C.-Y.
<Astron. Astrophys. 641, A24 (2020)>
=2020A&A...641A..24W 2020A&A...641A..24W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Millimetric/submm sources
Keywords: galaxies: spiral - galaxies: star formation - galaxies: ISM
Abstract:
We investigated the influence of the random velocity of molecular gas
on star-formation activities of 6 nearby galaxies. The physical
properties of a molecular cloud, such as temperature and density,
influence star-formation activities in the cloud. Additionally, local
and turbulent motions of molecules in a cloud may exert substantial
pressure against gravitational collapse and thus prevent or reduce
star formation in the cloud. However, the influence of gas motion on
star-formation activities remains poorly understood. We used data from
the Atacama Large Millimeter/submillimeter Array to obtain
12CO(J=1-0) flux and velocity dispersion. We then combined these
data with 3.6 and 8 micron midinfrared data from the Spitzer Space
Telescope to evaluate the effects of gas motion on star-formation
activities in several nearby galaxies. We discovered that relatively
high velocity dispersion in molecular clouds corresponded with
relatively low star-formation activity. Considering the velocity
dispersion as an additional parameter, we derived a modified
Kennicutt-Schmidt law with a gas surface density power index 0.84 and
velocity dispersion power index -0.61.
Description:
Files Table1.dat and Table2.dat contain the project code, velocity
resolution, restoring beam size, ALMA array type and selected box size
presented in the paper. Our data were obtained from the ALMA and
Spitzer space telescope archive.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 6 Galaxy information
table2.dat 55 6 Data information and selected box size
table3.dat 63 8 Correlation between the 12CO(J=1-0) luminosity
surface density and SFR surface density
table4.dat 59 8 Correlation between the velocity dispersion and
12CO(J=1-0) luminosity surface density
table5.dat 65 8 Correlation between the velocity dispersion and
SFR surface density
table6.dat 66 10 SFR surface density as a function of the velocity
dispersion and 12CO(J=1-0) luminosity surface
density
list.dat 141 7 List of fits datacubes
fits/* . 7 Individual fits datacubes
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- ALMA ALMA Project code
16- 30 A15 --- Galaxy Galaxy name
32- 40 A9 --- Morph Morphology of the galaxy
42- 43 I2 d Inc Inclination angle of the galaxy
45- 49 F5.2 Mpc Dist Luminosity Distance of the galaxy
51- 60 A10 --- Array ALMA array type
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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- 15 A15 --- Galaxy Galaxy name
17- 19 F3.1 km/s velres Velocity resolution
21- 25 A5 --- boxnum Box number
27- 35 A9 arcsec beam Restoring beam size
37- 45 A9 arcsec ALMAbox ALMA box size
47- 55 A9 arcsec Spitbox Spitzer box size
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Galaxy Galaxy name
17- 18 I2 --- N Number of data points for fitting
20- 24 F5.2 --- R Pearson correlation coefficient
26- 29 F4.2 --- PR Probability of the Pearson correlation
31- 35 F5.2 --- Roh Spearman rank correlation
37- 40 F4.2 --- PRoh Probability of the Spearman rank correlation
42- 46 F5.2 --- Alpha1 Fitting power law index
48- 51 F4.2 --- e_Alpha1 Fitting power law index error
53- 57 F5.2 --- C1 Fitting constant
59- 63 F5.2 --- e_C1 Fitting constant error
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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- 15 A15 --- Galaxy Galaxy name
17- 18 I2 --- N Number of data points for fitting
20- 23 F4.2 --- R Pearson correlation coefficient
25- 28 F4.2 --- PR Probability of the Pearson correlation
30- 33 F4.2 --- Roh Spearman rank correlation
35- 38 F4.2 --- PRoh Probability of the Spearman rank correlation
40- 43 F4.2 --- Beta1 Fitting power law index
45- 48 F4.2 --- e_Beta1 Fitting power law index error
50- 54 F5.2 --- C2 Fitting constant
56- 59 F4.2 --- e_C2 Fitting constant error
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Galaxy Galaxy name
17- 18 I2 --- N Number of data points for fitting
20- 24 F5.2 --- R Pearson correlation coefficient
26- 29 F4.2 --- PR Probability of the Pearson correlation
31- 35 F5.2 --- Roh Spearman rank correlation
37- 40 F4.2 --- PRoh Probability of the Spearman rank correlation
42- 46 F5.2 --- Beta2 Fitting power law index
48- 52 F5.2 --- e_Beta2 Fitting power law index error
54- 59 F6.2 --- C3 Fitting constant
61- 65 F5.2 --- e_C3 Fitting constant error
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 33 A33 --- Galaxy Galaxy name
35- 39 F5.2 --- Alpha2 Fitting power law index
41- 44 F4.2 --- e_Alpha2 Fitting power law index error
46- 50 F5.2 --- Beta3 Fitting power law index
52- 55 F4.2 --- e_Beta3 Fitting power law index error
57- 61 F5.2 --- C4 Fitting constant
63- 66 F4.2 --- e_C4 Fitting constant error
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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- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of slices
32- 57 A26 "datime" Obs.date Observation date
59- 65 F7.3 GHz bFreq Lower value of frequency interval
67- 73 F7.3 GHz BFreq Upper value of frequency interval
75- 82 F8.6 MHz dFreq Frequency resolution
84- 89 I6 Kibyte size Size of FITS file
91-116 A26 --- FileName Name of FITS file, in subdirectory fits
118-141 A24 --- Title Title of the FITS file
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Acknowledgements:
Tsan-Ming Wang, twan(at)uni-bonn.de
(End) Patricia Vannier [CDS] 19-Jun-2020