Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007atnf.prop..959t&link_type=abstract
ATNF proposal M253, Semester: April, 2007
Physics
Galactic, Mopra
Scientific paper
We plan to search for dense cores embedded in the filamentary cloud of Musca for the first time in order to investigate how filamentary cloud evolves by gravitational instability and fragmentation to form stars. The remarkably elongated structure of the Musca cloud has penetrating magnetic field lines perpendicular to the long axis without surrounding source of external pressure. As indicated by IRAS 100 micron dust emission and 13CO map by NANTEN, it is supposed to have dense molecular cloud cores embedded in the filament as results of gravitational fragmentation. Our near-IR survey found 2 young stars in the filament, and submm observations revealed that one of them is embedded in a dense core and driving a bipolar molecular outflow. These show that star formation is ongoing. It is likely that the Musca cloud is dynamically contracting and has formed dense cores in a quiescent condition under the influence of magnetic field. We aim to investigate the cloud and core dynamics by estimating the physical conditions of the cores (mass, density and gravitational stability) by mappings in optically thin molecular lines which traces densities from 10^4 to >10^5 cm^-3.
Itoh Yoichi
Miyamoto Izumi
Niwa Takahiro
Oasa Yumiko
Tachihara Kengo
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