J/A+A/675/A37 M83 HI datacube (Eibensteiner+, 2023)
Kinematic analysis of the super-extended HI disk of the nearby spiral
galaxy M 83.
Eibensteiner C., Bigiel F., Leroy A.K., Koch E.W., Rosolowsky E.,
Schinnerer E., Sardone A., Meidt S., de Blok W.J.G., Thilker D.,
Pisano D.J., Ott J., Barnes A., Querejeta M., Emsellem E., Puschnig J.,
Utomo D., Beslic I., den Brok J., Faridani S., Glover S.C.O., Grasha K.,
Hassani H., Henshaw J.D., Jimenez-Donaire M.J., Kerp J., Dale D.A.,
Kruijssen J.M.D., Laudage S., Sanchez-Blazquez P., Smith R.,
Stuber S., Pessa I., Watkins E.J., Williams T.G., Winkel B.
<Astron. Astrophys. 675, A37 (2023)>
=2023A&A...675A..37E 2023A&A...675A..37E (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Radio lines
Keywords: ISM: kinematics and dynamics - radio lines: galaxies -
galaxies: groups: individual: M83
Abstract:
We present new HI observations of the nearby massive spiral galaxy
M83, taken with the JVLA at 21 arcsec angular resolution (∼500pc) of
an extended (∼1.5deg2) ten-point mosaic combined with GBT
single-dish data. We study the super-extended HI disk of M83 (∼50kpc
in radius), in particular disk kinematics, rotation, and the turbulent
nature of the atomic interstellar medium. We define distinct regions
in the outer disk (rgal> central optical disk), including a ring, a
southern area, a southern arm and a northern arm. We examine HI gas
surface density, velocity dispersion, and noncircular motions in the
outskirts, which we compare to the inner optical disk. We find an
increase of velocity dispersion (σv) toward the pronounced HI
ring, indicative of more turbulent HI gas. Additionally, we report
over a large galactocentric radius range (until rgal∼50kpc) where
σv is slightly larger than thermal component (i.e., >8km/s).
We find that a higher star-formation rate (as traced by far UV
emission) is not necessarily always associated with a higher HI
velocity dispersion, suggesting that radial transport could be a
dominant driver for the enhanced velocity dispersion. Furthermore, we
find a possible branch that connects the extended HI disk to the dwarf
irregular galaxy UGCA 365 and that deviates from the general direction
of the northern arm. Lastly, we compare mass flow rate profiles (based
on 2D and 3D tilted ring models) and find evidence for outflowing gas
at rgal∼2kpc, inflowing gas at rgal∼5.5kpc, and outflowing gas at
rgal∼14kpc. We caution that mass flow rates are highly sensitive to
the assumed kinematic disk parameters, in particular to inclination.
Description:
ngc5236m83-vlagbtsdf1-K-ms.fits is the fits cube that
is based on the publication mentioned above. In depth details on how
we imaged this data cube can be read in Section '2.3. Imaging'. We
combined the 10-point mosaic VLA observations with the single dish GBT
data.
We list here some important quantities extracted from the header:
NAXIS1 = 750
NAXIS2 = 750
NAXIS3 = 75
BMAJ = 5.833333333333E-03 / = 21arcsec
BMIN = 5.833333333333E-03 / = 21arcsec
BPA = 0.000000000000E+00
BTYPE = 'Intensity'
OBJECT = 'M83'
BUNIT = 'K'
INSTRUME= 'EVLA'
RESTFRQ = 1420405750.0 / [Hz] Line rest frequency
CUNIT3 = 'm s-1' / in m/s but can
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
13 37 00.91 -29 51 56.7 M83 = NGC5236
-----------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 136 1 Information on fits datacube
fits/* . 1 fits datacube
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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- 29 I2 --- Nz Number of pixels along Z-axis
31- 56 A26 "datime" Obs.date Observation date
58- 63 I6 m/s bVRAD Lower value of VRAD interval
65- 70 I6 m/s BVRAD Upper value of VRAD interval
72- 78 F7.2 m/s dVRAD VRAD resolution
80- 85 I6 Kibyte size Size of FITS file
87-119 A33 --- FileName Name of FITS file, in subdirectory fits
121-136 A16 --- Title Title of the FITS file
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History:
From Cosima Eibensteiner, cosimaeibensteiner.astro(at)gmail.com
Acknowledgements:
Based on observations carried out with the Karl G. Jansky Very
Large Array (VLA). The National Radio Astronomy Observatory is a
facility of the National Science Foundation operated under cooperative
agreement by Associated Universities, Inc.
(End) Patricia Vannier [CDS] 12-May-2023