Collective outflow from a small multiple stellar system

Peters, Thomas and Klaassen, Pamela D. and Mac Low, Mordecai Mark and Schrön, Martin and Federrath, Christoph and Smith, Michael D. and Klessen, Ralf S. (2014) Collective outflow from a small multiple stellar system. Astrophysical Journal, 788 (1). p. 14. ISSN 0004-637X. (doi:https://doi.org/10.1088/0004-637X/788/1/14) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://www.dx.doi.org/10.1088/0004-637X/788/1/14

Abstract

The formation of high-mass stars is usually accompanied by powerful protostellar outflows. Such high-mass outflows are not simply scaled-up versions of their lower-mass counterparts, since observations suggest that the collimation degree degrades with stellar mass. Theoretically, the origins of massive outflows remain open to question because radiative feedback and fragmentation of the accretion flow around the most massive stars, with M > 15 M , may impede the driving of magnetic disk winds. We here present a three-dimensional simulation of the early stages of core fragmentation and massive star formation that includes a subgrid-scale model for protostellar outflows. We find that stars that form in a common accretion flow tend to have aligned outflow axes, so that the individual jets of multiple stars can combine to form a collective outflow. We compare our simulation to observations with synthetic H2 and CO observations and find that the morphology and kinematics of such a collective outflow resembles some observed massive outflows, such as Cepheus A and DR 21. We finally compare physical quantities derived from simulated observations of our models to the actual values in the models to examine the reliability of standard methods for deriving physical quantities, demonstrating that those methods indeed recover the actual values to within a factor of two to three. © 2014. The American Astronomical Society. All rights reserved..

Item Type: Article
Uncontrolled keywords: ISM: jets and outflows, radiative transfer, stars: formation, stars: massive
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 10 Aug 2015 15:40 UTC
Last Modified: 11 Aug 2015 10:23 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50079 (The current URI for this page, for reference purposes)
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