Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.8907p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #89.07; Bulletin of the American Astronomical Society, Vol. 39, p.879
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Infrared Dark Clouds (IRDCs) are cold and dense regions (T < 25 K, n > 105 cm-3) that are seen as extinction features against the bright mid-IR Galactic background. IRDCs harbor compact cores, which have the same sizes and masses as embedded clusters and are believed to be precursors to stellar clusters. As a consequence of its high resolution and wide bandwidth, the Combined Array for Research in Millimeter-Wave Astronomy (CARMA) presents an exceptional opportunity to study in detail the structure and dynamics of these proto-cluster cores.
We present 3 mm continuum observations obtained with CARMA of 11 IRDC cores. The objective of this study is to establish if mass segregation can be identified at the formative stage of a stellar cluster. Millimeter continuum emission from compact sources, hereafter referred as kernels, was detected towards 9 of the 11 IRDC cores observed: in total we detected 22 kernels. We calculated the mass fraction of the IRDC core present in the detected kernels using the emission from the 3 mm continuum images and published 1.2 mm fluxes. The obtained masses for the kernels range between 6 to 250 M&sun;, indicating that they have the potential to form high mass stars. We have also analyzed the spatial distribution and kinematics of the kernels with respect to the large scale IRDC core, to investigate whether or not mass segregation is present in this early stage of cluster formation.
Carpenter John Michael
Perez Munoz Laura M.
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