Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.5304k&link_type=abstract
American Astronomical Society Meeting 202, #53.04; Bulletin of the American Astronomical Society, Vol. 35, p.772
Astronomy and Astrophysics
Astronomy
Scientific paper
Pre-stellar cores are defined to be the stage of star formation that preceeds the formation of a hydro-static protostar. In this talk I will present observations of prestellar cores taken at 850 and 450μ m with the SCUBA submillimetre camera. A subsample of these cores were also observed with ISOPHOT at 90, 170 and 200μ m. Colour temperature maps of the cores surveyed with ISO show that half have a positive centre to edge temperature gradient. The cores surveyed with SCUBA can be split into two groups based on their peak flux at 850μ m. Cores with a peak flux greater than 144 mJy/Beam have higher dust masses and smaller radii that the fainter cores. SEDs of 18 cores show they are in approximate agreement with a dust temperature of ˜10K. Comparison between incident and emitted luminosities show that the cores are in thermal balance and do not require an embedded heat source. Radial flux profiles of a number of cores can be fitted with a marginally stable Bonnor-Ebert Sphere column density profile. It the two groups of SCUBA cores are part of an evolutionary sequence then the trend in their statistical timescales is consistant with theories of ionisation regulared star formation.
This research was funded by the Particle Physics and Astronomy Research Council of the United Kingdom.
Andre Pascal
Kirk Jason M.
Ward-Thompson Derek
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