J/A+A/620/L1 ALMA detects a radial disk wind in DG Tau (Guedel+, 2018)
ALMA detects a radial disk wind in DG Tauri.
Guedel M., Eibensteiner C., Dionatos O., Audard M., Forbrich J., Kraus S.,
Rab C., Schneider C., Skinner S., Vorobyov E.
<Astron. Astrophys., 620, L1 (2018)>
=2018A&A...620L...1G 2018A&A...620L...1G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Carbon monoxide ;
Millimetric/submm sources ; Carbon monoxide ; Stars, distances ;
Stars, masses
Keywords: stars: pre-main sequence - stars: winds - outflows -
protoplanetary disks
Abstract:
We aim to use the high spatial resolution of the Atacama Large
Millimeter/submillimeter Array (ALMA) to map the flow pattern of
molecular gas near DG Tauri and its disk, a young stellar object
driving a jet and a molecular outflow.
We use observations from ALMA in the J=2-1 transition of 12CO,
13CO, and C18O to study the Keplerian disk of DG Tauri and
outflows that may be related to the disk and the jet.
We find a new wind component flowing radially at a steep angle
(~=25° from the vertical) above the disk with a velocity of
~=3.1km/s. It continues the trend of decreasing velocity for
increasing distance from the jet axis ("onion-like velocity
structure"). Conclusions. The new component is located close to the
protostellar disk surface and may be related to photoevaporative
winds.
Description:
We provide the continuum subtracted image cube (velocity resolution =
0.16km/s) in the J=2-1 transition of 12CO (230.538GHz) from the
observation with ALMA of DG Tau on 24/26 September 2016 using 42 of
the 12m antennas (Cycle 3). Continuum subtraction was done with the
Casa version 5.1.0-74 and imaging with the CLEAN algorithm.
Parameters were set as follows (for 12CO):
fitspw = '1:0∼415;522∼952' for continuum subtraction and for imaging:
mode = 'velocity', width = '0.16km/s', interpolation = 'linear',
niter= '5000', threshold = '12.0mJy', cell=['0.02arcsec'],
imsize=[512,512], outframe='LSRK', restfreq='230.538GHz',
weighting='briggs', robust=0.5;
Also, we provide continuum subtracted image cube in the J=2-1
transitions of 13CO (220,398GHz ; 0.17km/s) and C18O (219,560GHz;
0.17km/s) from the ALMA observations on DG Tau in 24/26 September 2016
using 42 of the 12m antennas (Cycle 3). Continuum subtraction was done
with the Casa version 5.1.0-74 and imaging with the CLEAN algorithm.
Parameters were set as follows (for 13CO):
fitspw = '2:0∼443;489∼937' for continuum subtraction and for
imaging:mode='velocity', width='0.17km/s', interpolation='linear',
niter=5000, threshold='13.5mJy', cell=['0.02arcsec'], imsize=[512,
512], outframe='LSRK', restfreq='220.398GHz', weighting='briggs',
robust=0.5;
Parameters were set as follows (for C18O):
fitspw = '3:0∼437;496∼940' for continuum subtraction and for imaging:
mode='velocity', width='0.17km/s', interpolation='linear', niter=5000,
threshold='12.0mJy', cell=['0.02arcsec'], imsize=[512, 512],
outframe='LSRK', restfreq='219.560GHz', weighting='briggs',
robust=0.5;
Objects:
--------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------
04 27 04.69 +26 06 16.0 DG Tau = V* DG Tau
--------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 112 3 List of fits files
fits/* . 3 Individual fits files
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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- 54 A23 "datime" Obs.date Observation date
56- 62 F7.3 GHz bFREQ Lower value of frequency interval
64- 70 F7.3 GHz BFREQ Upper value of frequency interval
72- 77 I6 Hz dFREQ Frequency resolution
79- 84 I6 Kibyte size Size of FITS file
86- 94 A9 --- FileName Name of FITS file, in subdirectory fits
96-112 A17 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Manuel Guedel, manuel.guedel(at)univie.ac.at
(End) Patricia Vannier [CDS] 06-Jul-2021