Resolving the Collimation Zone of an Intermediate-mass Protostellar Jet

Rodríguez-Kamenetzky, Adriana R. and Carrasco-González, Carlos and Rodríguez, Luis F. and Ray, Tom P. and Sanna, Alberto and Moscadelli, Luca and Hoare, Melvin and Galván-Madrid, Roberto and Shang, Hsien and Lizano, Susana and Eislöffel, Jochen and Lim, Jeremy and Torrelles, José M. and Ho, Paul and Feeney-Johansson, Anton (2022) Resolving the Collimation Zone of an Intermediate-mass Protostellar Jet. The Astrophysical Journal Letters, 931 (2). L26. ISSN 2041-8205

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Abstract

We report new VLA and e-MERLIN high-resolution and -sensitivity images of the triple radio continuum source in the Serpens star-forming region. These observations allowed us to perform a deep multifrequency, multiepoch study by exploring the innermost regions (≲100 au) of an intermediate-mass young stellar object for the first time, with a physical resolution of ∼15 au. The kinematic analysis of knots recently ejected by the protostar indicates that the jet is undergoing episodic variations in velocity. In addition, our multifrequency images reveal striking characteristics, e.g., a highly collimated ionized stream that would be launched at a radial distance of ∼0.4 au from the protostar and a narrow (∼28 au wide) ionized cavity that would be excited by the interaction of a wide-angle component with the surrounding toroid of infalling material. In light of these results, we propose the scenario in which both a highly collimated jet and a wide-angle wind coexist as the most plausible to explain our observations, either launched by the X-wind or X-plus-disk-wind mechanism.

Item Type: Article
Subjects: AP Academic Press > Physics and Astronomy
Depositing User: Unnamed user with email support@apacademicpress.com
Date Deposited: 26 Apr 2023 05:35
Last Modified: 24 May 2024 06:00
URI: http://info.openarchivespress.com/id/eprint/1082

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