C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST23:39:40

2015A&A...581A..91S - Astronomy and Astrophysics, volume 581A, 91-91 (2015/9-1)

Disentangling the jet emission from protostellar systems. The ALMA view of VLA 1623.


Abstract (from CDS):

High-resolution studies of class 0 protostars represent the key to constraining protostar formation models. VLA 16234-2417 represents the prototype of class 0 protostars, and it has been recently identified as a triple non-coeval system. We aim at deriving the physical properties of the jets in VLA 16234-2417 using tracers of shocked gas. ALMA Cycle 0 Early Science observations of CO(2-1) in the extended configuration are presented in comparison with previous SMA CO(3-2) and Herschel-PACS [OI] 63µm observations. Gas morphology and kinematics were analysed to constrain the physical structure and origin of the protostellar outflows. We reveal a collimated jet component associated with the [OI] 63µm emission at about 8'' (∼960AU) from source B. This newly detected jet component is inversely oriented with respect to the large-scale outflow driven by source A, and it is aligned with compact and fast jet emission very close to source B (about 0.3") rather than with the direction perpendicular to the A disk. We also detect a cavity-like structure at low projected velocities, which surrounds the [OI] 63µm emission and is possibly associated with the outflow driven by source A. Finally, no compact outflow emission is associated with source W. Our high-resolution ALMA observations seem to suggest there is a fast and collimated jet component associated with source B. This scenario would confirm that source B is younger than A, that it is in a very early stage of evolution, and that it drives a faster, more collimated, and more compact jet with respect to the large-scale slower outflow driven by A. However, a different scenario of a precessing jet driven by A cannot be firmly excluded from the present observations.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: low-mass - ISM: jets and outflows - ISM: individual objects: VLA 16234-2417

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 CRBR 2316.0-1626 Y*? 16 26 17.46816 -24 23 12.9552           ~ 21 0
2 ALMA J162625.63-242429.5 Y*O 16 26 25.62 -24 24 28.9           ~ 28 1
3 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 382 0
4 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3165 1

    Equat.    Gal    SGal    Ecl

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