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YSO jets in the Galactic plane from UWISH2 - II. Outflow luminosity and length distributions in Serpens and Aquila

Ioannidis, G., Froebrich, Dirk (2012) YSO jets in the Galactic plane from UWISH2 - II. Outflow luminosity and length distributions in Serpens and Aquila. Monthly Notices of the Royal Astronomical Society, 425 (2). pp. 1380-1393. ISSN 0035-8711. (doi:10.1111/j.1365-2966.2012.21556.x)

Abstract

Jets and outflows accompany the mass accretion process in protostars and young stellar objects. Using a large and unbiased sample, they can be used to study statistically the local feedback they provide and the typical mass accretion history. Here we analyse such a sample of molecular hydrogen emission-line objects in the Serpens and Aquila part of the Galactic plane. Distances are measured by foreground star counts with an accuracy of 25per cent. The resulting spacial distribution and outflow luminosities indicate that our objects sample the formation of intermediate-mass objects. The outflows are unable to provide a sizeable fraction of energy and momentum to support, even locally, the turbulence levels in their surrounding molecular clouds. The fraction of parsec scale flows is one quarter and the typical dynamical jet age of the order of 10 4yr. Groups of emission knots are ejected every 10 3yr. This might indicate that low-level accretion rate fluctuations and not FU-Ori-type events are responsible for the episodic ejection of material. Better observational estimates of the FU-Ori duty cycle are needed. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2012.21556.x
Additional information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "YSO jets in the Galactic plane from UWISH2 – II. Outflow luminosity and length distributions in Serpens and Aquila", G. Ioannidis and Dirk Froebrich, is available online at: http://www.dx.doi.org/10.1111/j.1365-2966.2012.21556.x
Uncontrolled keywords: star formation, stars, winds, outflows, galactic plane, jets
Subjects: Q Science > QB Astronomy
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: 20 Jul 2015 15:56 UTC
Last Modified: 29 May 2019 14:51 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49557 (The current URI for this page, for reference purposes)
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