The State and Evolution of Isolated Dense Molecular Cores

Details The State and Evolution of Isolated Dense Molecular Cores The State and Evolution of Isolated Dense Molecular Cores

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5704k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #57.04; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present highlights from our recent millimeter dust emission and Spitzer imaging surveys of nearby (< 500 pc) isolated dense molecular cores, the sites of low-mass star formation. The sample studied includes starless and protostellar cores and allows to compare their properties in a homogenous manner.
One aim of our research is to understand how the mass distribution in dense cores controls the presence or absence of young forming stars. A detailed analysis reveals necessary (but not sufficient) conditions for active star formation to be possible. Also, a significant fraction of the cores is not stable to gravitational collapse if only supported by thermal and turbulent pressure. This might hint at significant support from magnetic fields. Furthermore, class 0 and class I protostars covered by our surveys cannot be uniquely discriminated, suggesting a revision of criteria used to assign infrared classes.
Finally, we report the discovery of L1148-IRS, a candidate Very Low Luminosity Object (VeLLO; L < 0.1 Lsun) in the L1148 dense core. If L1148-IRS is indeed a VeLLO, then it is an interesting one. This would be the first known VeLLO with a definitely subsolar and possibly even substellar final mass (< 0.25 Msun). Moreover, the formation of L1148-IRS could not be understood in the framework of the quasistatic evolution of dense cores. Based on our survey data we briefly review the properties of known VeLLO cores and discuss their formation.

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