J/A+A/592/A49 TW Hya CO (2-1), CN (2-1) and CS (5-4) data cubes (Teague+, 2016)
Measuring turbulence in TW Hya with ALMA: methods and limitations.
Teague R., Guilloteau S., Semenov D., Henning T., Dutrey A., Pietu V.,
Birnstiel T., Chapillon E., Hollenbach D., Gorti U.
<Astron. Astrophys. 592, A49 (2016)>
=2016A&A...592A..49T 2016A&A...592A..49T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Spectroscopy
Keywords: techniques: interferometric - turbulence - methods: observational -
ISM: kinematics and dynamics - submillimeter: ISM
Abstract:
We aim to obtain a spatially resolved measurement of velocity
dispersions in the disk of TW Hya.
We obtained images with high spatial and spectral resolution of the
CO J=2-1, CN N=2-1 and CS J=5-4 emission with ALMA in Cycle 2. The
radial distribution of the turbulent broadening was derived with two
direct methods and one modelling approach. The first method requires a
single transition and derives Tex directly from the line profile,
yielding a vturb. The second method assumes that two different
molecules are co-spatial, which allows using their relative line
widths for calculating Tkin and vturb. Finally we fitted a
parametric disk model in which the physical properties of the disk are
described by power laws, to compare our direct methods with previous
values.
Description:
The observations were performed using ALMA on May 13, 2015 under
excellent weather conditions (Cycle 2, 2013.1.00387.S). The receivers
were tuned to cover CO J=(2-1), CS J=(5-4) and all strong hyperfine
components of CN N=(2-1) simultaneously. The correlator was configured
to deliver very high spectral resolution, with a channel spacing of
15kHz (and an effective velocity resolution of 40m/s) for the CO
J=(2-1) and CS J=(5-4) lines, and 30kHz (80m/s) for the CN N=(2-1)
transition.
Objects:
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RA (2000) DE Designation(s)
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11 01 51.91 -34 42 17.0 TW Hya = HIP 53911
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 113 4 List of fits datacubes
fits/* . 4 Individual fits datacubes
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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- 31 I4 --- Nz Number of slices
33- 45 F13.6 km/s bVrad Lower value of Vrad interval
47- 55 F9.2 km/s BVrad Upper value of Vrad interval
57- 63 F7.4 km/s dVrad Vrad resolution
65- 69 I5 Kibyte size Size of FITS file
71- 91 A21 --- FileName Name of FITS file, in subdirectory fits
93-113 A21 --- Title Title of the FITS file
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Acknowledgements:
Stephane Guilloteau, stephane.guilloteau(at)u-bordeaux.fr
(End) Patricia Vannier [CDS] 20-Jul-2016