J/ApJS/171/419 Catalog of LMC HI clouds (Kim+, 2007)
A catalog of H I clouds in the Large Magellanic Cloud.
Kim S., Rosolowsky E., Lee Y., Kim Y., Jung Y.-C., Dopita M.A.,
Elmegreen B.G., Freeman K.C., Sault R.J., Kesteven M., McConnell D.,
Chu Y.-H.
<Astrophys. J. Suppl. Ser., 171, 419-446 (2007)>
=2007ApJS..171..419K 2007ApJS..171..419K
ADC_Keywords: Radio sources ; Magellanic Clouds ; H I data
Keywords: galaxies: individual (Large Magellanic Clouds) - galaxies: ISM -
Magellanic Clouds - radio lines: galaxies
Abstract:
21cm neutral hydrogen interferometric survey of the Large Magellanic
Cloud (LMC) combined with the Parkes multibeam HI single-dish survey
(2003MNRAS.339...87S 2003MNRAS.339...87S) clearly shows that the HI gas is distributed in
the form of clumps or clouds. The HI clouds and clumps have been
identified using a thresholding method with three separate brightness
temperature thresholds (Tb). Each catalog of HI cloud candidates
shows a power-law relationship between the sizes and the velocity
dispersions of the clouds roughly following the Larson law scaling
σv∝R0.5, with steeper indices associated with
dynamically hot regions. The clouds in each catalog have roughly
constant virial parameters as a function of mass, suggesting that the
clouds are all in roughly the same dynamical state, but the values of
the virial parameter are significantly larger than unity, showing that
turbulent motions dominate gravity in these clouds. The mass
distribution of the clouds is a power law with differential indices
between -1.6 and -2.0 for the three catalogs. In contrast, the
distribution of mean surface densities is a lognormal distribution.
Description:
We cataloged the data from the combined surveys Kim et al.,
(2003ApJS..148..473K 2003ApJS..148..473K) of the Australia Telescope Compact Array (ATCA;
Kim et al., 1998ApJ...503..674K 1998ApJ...503..674K) and the Parkes 64m single-dish telescope
(Staveley-Smith et al., 2003MNRAS.339...87S 2003MNRAS.339...87S). The spatial resolution of
the map is 50"-55", corresponding to a physical resolution of 12-14pc
at the distance of the LMC (Alves, 2004NewAR..48..659A 2004NewAR..48..659A). The observing
band was centered on 1.419GHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 468 Catalog of HI clouds for the brightness
temperature threshold of 16K
table2.dat 76 406 Catalog of HI clouds for the brightness
temperature threshold of 32K
table3.dat 76 195 Catalog of HI clouds for the brightness
temperature threshold of 64K
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See also:
J/other/PASAu/6.471 : Magellanic Clouds bridge region HI profiles (McGee+ 1986)
Byte-by-byte Description of file: table[123].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Identification number (1)
5 I1 h RAh Hour of Right Ascension (J2000)
7- 8 I2 min RAm Minute of Right Ascension (J2000)
10- 14 F5.2 s RAs [0/60] Second of Right Ascension (J2000)
16 A1 --- DE- Sign of Declination (J2000)
17- 18 I2 deg DEd Degree of Declination (J2000)
20- 21 I2 arcmin DEm Arcminute of Declination (J2000)
23- 27 F5.2 arcsec DEs [0/60] Arcsecond of Declination (J2000)
29- 36 F8.3 pc Size Radius (size) of the cloud
38- 43 F6.2 km/s sigma Velocity dispersion
45- 50 F6.3 km/s e_sigma rms uncertainty on velocity dispersion
52- 63 F12.2 solMass Mass Mass of the cloud
65- 76 A12 --- Region Region name
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Note (1): [KRL2007] 16K NNN for table 1 in Simbad,
[KRL2007] 32K NNN for table 2 in Simbad,
[KRL2007] 64K NNN for table 3 in Simbad.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 27-Apr-2009