J/A+A/648/A41 12CO(2-1) datacubes of 3 IR sources (Vazzano+, 2021)
Outflows, envelopes, and disks as evolutionary indicators in Lupus young
stellar objects.
Vazzano M.M., Fernandez-Lopez M., Plunkett A., de Gregorio-Monsalvo I.,
Santamaria-Miranda A., Takahashi S., Lopez C.
<Astron. Astrophys. 648, A41 (2021)>
=2021A&A...648A..41V 2021A&A...648A..41V (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Interstellar medium ; Interferometry ; Carbon monoxide
Keywords: stars: formation - ISM: molecules - ISM: jets and outflows
Abstract:
The Lupus star-forming complex includes some of the closest low-mass
star-forming regions, and together they house objects that span
evolutionary stages from pre-stellar to pre-MS.
By studying 7 objects in the Lupus clouds from prestellar to
protostellar stages, we aim to test if a coherence exists between
commonly used evolutionary tracers.
We present ALMA observations of the 1.3mm continuum and molecular line
emission that probe the dense gas and dust of cores (continuum,
C18O, N2D+) and their associated molecular outflows (12CO).
Our selection of sources in a common environment, with identical
observing strategy, allows for a consistent comparison across
different evolutionary stages. We complement our study with continuum
and line emission from the ALMA archive in different bands.
The quality of the ALMA molecular data allows us to reveal the nature
of the molecular outflows in the sample by studying their morphology
and kinematics, through interferometric mosaics covering their full
extent. The interferometric images in IRAS 15398-3359 appear to show
that it drives a precessing episodic jet-driven outflow with at least
4 ejections separated by periods of time between 50 and 80 years,
while data in IRAS 16059-3857 show similarities with a wide-angle wind
model also showing signs of being episodic. The outflow of
J160115-41523 could be better explain with the wide-angle wind model
as well, but new observations are needed to further explore its
nature. We find that the most common evolutionary tracers in the
literature are useful for broad evolutionary classifications, but are
not consistent with each other to provide enough granularity to
disentangle different evolutionary stage of sources that belong to the
same Class (0, I, II, or III). The evolutionary classification
revealed by our analysis coincides with those determined by previous
studies for all our sources except J160115-41523. Outflow properties
used as protostellar age tracers, such as mass, momentum, energy and
opening angle, may suer from differences in the nature of each
outflow, and therefore detailed observations are needed to refine
evolutionary classifications. We found both AzTEC-lup1-2 and
AzTEC-lup3-5 to be in the pre-stellar stage, with the possibility that
the latter is a more evolved source. IRAS 15398-3359, IRAS 16059-3857
and J160115-41523, which have clearly detected outflows, are Class 0
sources, although we are not able to determine which is younger and
which is older. Finally Sz 102 and Merin 28 are the most evolved
sources in our sample and show signs of having associated flows, not
as well traced by CO as for the younger sources.
Description:
The FITS files contain the data cubes corresponding to the 12CO(2-1)
lines towards the IR sources IRAS15398-3359, IRAS16059-3857 and
J160115-41523, observed over a region of 110"x90", 280"x110", and
280"x110", respectively. All these sources have associated bipolar
molecular outflow. They were taken using the Atacama Large Millimeter
Array (ALMA) telescope. The cubes corresponding to IRAS15398-3359 and
IRAS16059-3857 were reduced by combining 7m+12m data, achieving
angular resolutions of 0.57"x0.50" and 1.73"x1.08", respectively. The
velocity resolution of these cubes are 0.32km/s. The data for
J160115-41523 were observed with the ALMA 7m array and have an angular
resolution of 7.06 "x4.48", and a velocity resolution of 0.17km/s.
Objects:
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RA (2000) DE Designation(s)
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15 43 02.21 -34 09 07.7 IRAS 15398-3359 = WISE J154302.21-340907.7
16 09 18.07 -39 04 53.4 IRAS 16059-3857 = WISE J160918.06-390453.7
16 01 15.49 -41 52 35.2 J160115-41523 = 2MASS J16011549-4152351
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 147 3 List of fits datacubes
fits/* . 3 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- 23 I4 --- Nx Number of pixels along X-axis
25- 27 I3 --- Ny Number of pixels along Y-axis
29- 30 I2 --- Nz Number of slices
32- 57 A26 "datime" Obs.date Observation date
59- 64 I6 m/s bVRAD Lower value of VRAD interval
66- 72 F7.1 m/s BVRAD Upper value of VRAD interval
74- 79 F6.2 m/s dVRAD VRAD resolution
81- 86 I6 Kibyte size Size of FITS file
88-106 A19 --- FileName Name of FITS file, in subdirectory fits
108-147 A40 --- Title Title of the FITS file
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Acknowledgements:
Maria Mercedes Vazzano, mvazzano(at)fcaglp.unlp.edu.ar
Inst. Argentino de Radioastronomia
(End) Maria Mercedes Vazzano [IAR], Patricia Vannier [CDS] 10-Feb-2021