J/A+A/566/A71 HI study of 18 nearby dwarf galaxies (Lelli+, 2014)
Dynamics of starbursting dwarf galaxies.
III. A HI study of 18 nearby objects.
Lelli F., Verheijen M., Fraternali F.
<Astron. Astrophys. 566, A71 (2014)>
=2014A&A...566A..71L 2014A&A...566A..71L
ADC_Keywords: Galaxies, nearby ; H I data
Keywords: galaxies: dwarf - galaxies: starburst -
galaxies: kinematics and dynamics - galaxies: evolution - dark matter
Abstract:
We investigate the dynamics of starbursting dwarf galaxies, using both
new and archival HI observations. We consider 18 nearby galaxies that
have been resolved into single stars by HST observations, providing
their star-formation history and total stellar mass. We find that 9
objects have a regularly rotating HI disk, 7 have a kinematically
disturbed HI disk, and 2 show unsettled HI distributions. Two galaxies
(NGC 5253 and UGC 6456) show a velocity gradient along the minor axis
of the HI disk, which we interpret as strong radial motions. For
galaxies with a regularly rotating disk we derive rotation curves,
while for galaxies with a kinematically disturbed disk we estimate the
rotation velocities in their outer parts. We derive baryonic fractions
within about 3 optical scale lengths and find that, on average,
baryons constitute at least 30% of the total mass. Despite the star
formation having injected 1056ergs in the ISM in the past 500 Myr,
these starbursting dwarfs have both baryonic and gas fractions similar
to those of typical dwarf irregulars, suggesting that they did not
eject a large amount of gas out of their potential wells.
Description:
HI datacubes in FITS format for 18 nearby starbursting dwarf galaxies.
The channel maps are in equatorial coordinates and in units of
Jy/beam. The spatial and velocity resolutions of the cubes are listed
in Table B1 (columns 6 and 8). The approximate spatial resolution (in
arcsec) is indicated in the file name. Adjacent channel maps in the
cubes are not independent due to velocity smoothing after imaging (see
paper).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 74 18 Properties of the HI datacubes
list.dat 164 18 List of FITS data cubes
fits/* . 18 Individual data cubes
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See also:
J/A+A/366/428 : HI observations of nearby dwarf galaxies (Karachentsev+, 2001)
J/A+A/433/751 : Nearby Southern dwarf galaxies BR photometry (Makarova+, 2006)
J/AJ/138/1203 : Star formation regions in nearby dwarf galaxies (Melena+, 2009)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name
14- 17 A4 --- Tel Telescope
19- 22 F4.1 arcsec BeamO1 Original beam (in arcsec)
23 A1 --- --- [x]
24- 27 F4.1 arcsec BeamO2 Original beam (in arcsec)
29- 31 I3 pc BeamO1p Original beam (in pc)
32 A1 --- --- [x]
33- 35 I3 pc BeamO2p Original beam (in pc)
37- 39 F3.1 km/s DVo Original velocity interval (ΔV)
41- 44 F4.1 arcsec BeamF1 Final beam (in arcsec)
45 A1 --- --- [x]
46- 49 F4.1 arcsec BeamF2 Final beam (in arcsec)
51- 53 I3 pc BeamF1p Final beam (in pc)
54 A1 --- --- [x]
55- 57 I3 pc BeamF2p Final beam (in pc)
59- 62 F4.1 km/s DVf Final velocity interval (ΔV)
64- 67 F4.1 --- RHI ?=- HI radius per beam
69- 72 F4.2 mJy rms rms noise (in mJy/beam)
74 A1 --- Ref Source (1)
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Note (1): Sources as follows:
a = This work
b = Hunter et al. (2012AJ....144..134H 2012AJ....144..134H, Cat. J/AJ/144/134)
c = Elson et al. (2013MNRAS.429.2550E 2013MNRAS.429.2550E)
d = Swaters et al. (2002A&A...390..829S 2002A&A...390..829S)
e = Walter et al. (2008AJ....136.2563W 2008AJ....136.2563W, Cat. J/AJ/136/2563)
f = Lopez-Sanchez et al. (2012MNRAS.419.1051L 2012MNRAS.419.1051L)
g = Lelli et al. (2012A&A...544A.145L 2012A&A...544A.145L)
h = Lelli et al. (2012A&A...537A..72L 2012A&A...537A..72L)
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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- 12 A12 --- Name Galalxy name
14- 22 F9.5 deg RAdeg Right Ascension of center (J2000)
23- 31 F9.5 deg DEdeg Declination of center (J2000)
33- 35 F3.1 arcsec/pix Scale [0.5/9] Scale of the image
37- 40 I4 --- Nx [171/1024] Number of pixels along X-axis
41 A1 --- --- [x]
42- 45 I4 --- Ny [171/1024] Number of pixels along Y-axis
46 A1 --- --- [x]
47- 49 I3 --- Nz [24/237] Number of slices
57- 65 F9.4 km/s bVel Velocity interval (lower limit)
73- 80 F8.4 km/s BVel Velocity interval (upper limit)
86- 92 F7.5 km/s dVel [1.2/9] Velocity resolution
94- 99 I6 Kibyte size [3805/434340] Size of FITS file
101-126 A26 --- FileName Name of FITS file in subdirectory fits
128-164 A37 --- Title Title of the file
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Acknowledgements:
Federico Lelli, lelli(at)astro.rug.nl
References:
Lelli et al., Paper I 2012A&A...537A..72L 2012A&A...537A..72L
Lelli et al., Paper II 2012A&A...544A.145L 2012A&A...544A.145L
(End) F. Lelli [Kapteyn Inst., The Netherlands], P. Vannier [CDS] 04-May-2014