Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..329f&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
To better understand how the initial conditions of the highly complex star formation process depend on environmental conditions, it is crucial to study at high-angular resolution the morphology, the kinematics, and eventually the interactions of pre-stellar core candidates associated with intermediate-/high-mass star formation. In this work, we study the cold condensations in the intermediate-/high-mass proto-cluster IRAS 05345+3157, focusing on the interaction with the other objects in the cluster. We have performed millimeter high-angular resolution observations, both in the continuum and several molecular lines, with the PdBI and the SMA. The main results of this work are the following: the observations reveal the presence of 3 warm cores identified in the millimeter continuum, called C1-a, C1-b and C2, and of two very cold and dense cores, called N and S, identified by observations of D , a molecular species eminently suitable to trace pre-stellar gas. None of the millimeter cores are associated with cores N and S. C1-b is likely a massive young stellar object driving a powerful ouflow. The study of the gas kinematics across the source indicates a tight interaction between the deuterated condensations and the sources embedded in the millimeter cores. For the nature of N and S, we propose two scenarios: they can be either low-mass pre-stellar condensations in which turbulent motions are dominant, or 'seeds' of future high-mass star(s).
Bourke Tyler L.
Caselli Paola
Fontani Francesco
Zhang Qian
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