Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741601l&link_type=abstract
American Astronomical Society, AAS Meeting #217, #416.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
A comprehensive data set of massive quiescent cores in Orion have been assembled to study early phases of massive star formation. These cores were mapped in spectral tracers, such as NH3 (VLA, GBT, and Effellsberg), N2H+ (CARMA and FCRAO), HCO+ (CARMA and CSO) as well as dust continuum by Spitzer and CSO. Part of the data set were published in Li et al. 2003, Li et al. 2007, and Velusamy et al. 2008.
These massive cores were found to be largely externally heated, roughly 10 times more massive than cores
in low mass star-forming regions, and have a core mass function significantly flatter than the Salpeter initial mass function (IMF). In this talk, I will focus on results based on the combined VLA and GBT NH3 maps. At a beam size of about 4", we resolve a set of massive cores down to 0.01 pc. Based on direct measurement of temperature and turbulence, these cores do not have adequate pressure support and are probably supercritical. They are sites of ongoing and likely future star formation.
Kauffmann Jens
Li Di
Zhang Qian
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