SCYON Abstract

Received on May 15 2008

The structures of embedded clusters in the Perseus, Serpens and Ophiuchus molecular clouds

AuthorsS. Schmeja (1,2), M.S.N. Kumar (1), and B. Ferreira (3)
Affiliation(1) Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
(2) Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik, Albert-Ueberle-Str. 2, 69120 Heidelberg, Germany
(3) Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA
Accepted byMonthly Notices of the Royal Astronomical Society
Contactsschmeja@ita.uni-heidelberg.de
URLhttp://arxiv.org/abs/0805.2049
Links IC 348 / NGC 1333

Abstract

The young stellar population data of the Perseus, Ophiuchus and Serpens molecular clouds are obtained from the Spitzer c2d legacy survey in order to investigate the spatial structure of embedded clusters using the nearest neighbour and minimum spanning tree method. We identify the embedded clusters in these clouds as density enhancements and analyse the clustering parameter Q with respect to source luminosity and evolutionary stage. This analysis shows that the older Class 2/3 objects are more centrally condensed than the younger Class 0/1 protostars, indicating that clusters evolve from an initial hierarchical configuration to a centrally condensed one. Only IC 348 and the Serpens core, the older clusters in the sample, shows signs of mass segregation (indicated by the dependence of Q on the source magnitude), pointing to a significant effect of dynamical interactions after a few Myr. The structure of a cluster may also be linked to the turbulent energy in the natal cloud as the most centrally condensed cluster is found in the cloud with the lowest Mach number and vice versa. In general these results agree well with theoretical scenarios of star cluster formation by gravoturbulent fragmentation.