A Disk Wind Driving the Rotating Molecular Outflow in CB 26
Por:
Lopez-Vazquez, J. A., Zapata, Luis A., Lee C.-F.
Publicada:
1 feb 2023
Resumen:
We present the (CO)-C-12 (J = 2-1) sensitive molecular line and 1.3 mm
continuum observations from the Submillimeter Array (SMA) of the bipolar
outflow associated with the young star located in the Bok globule known
as CB 26. The SMA observations were carried out in its extended
configuration allowing us to study the kinematics and structure of the
outflow with about 1 `' or 140 au resolution. We find that the dusty and
edge-on circumstellar disk related to the outflow has a projected
spatial (deconvolved) size of 196 +/- 31 x 42 +/- 29 au with a total
(gas+dust) mass of 0.031 +/- 0.015 M (circle dot). We estimated a
dynamical mass for the central object of 0.66 +/- 0.03 M (circle dot),
and the mass of the molecular outflow of 5 +/- 1.5 x 10(-5) M (circle
dot). All these values are consistent with recent estimations. The
observations confirm that the outflow rotation has a similar orientation
to that of the edge-on disk. For the outflow, we find that the following
quantities: the rotation velocity (similar to 1-3 km s(-1)), specific
angular momentum (similar to 200-700 au km s(-1)), and launching radius
(similar to 15-35 au) decrease with the height above the midplane, as
observed in other molecular rotating outflows. The radius (similar to
180-280 au) and expansion velocity (similar to 2-4 km s(-1)) also
increase with the height above the disk midplane for z < 0 au; however,
for z > 0 au these quantities do not exhibit this behavior. Estimations
of the outflow linear momentum rate, outflow angular momentum rate, and
accretion luminosity seem to be well explained by the presence of a disk
wind in CB 26.
Filiaciones:
Lopez-Vazquez, J. A.:
Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3-72, Michoacán, 58089, Mexico
Zapata, Luis A.:
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3-72, Michoacán, 58089, Mexico
Lee C.-F.:
Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
Green Submitted, All Open Access; Green
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