The initial conditions of star formation VIII: an observational study of the Ophiuchus cloud L1688 and implications for the prestellar core mass function

Abstract

We re-analyse all of the archive observations of the Ophiuchus dark cloud L1688 that were carried out with the submillimetre common-user bolometer array (SCUBA) at the James Clerk Maxwell Telescope (JCMT). For the first time we put together all of the data that were taken of this cloud at different times to make a deeper map at 850 microns than has ever previously been published. Using this new, deeper map we extract the pre-stellar cores from the data. We use updated values for the distance to the cloud complex, and also for the internal temperatures of the pre-stellar cores to generate an updated core mass function (CMF). This updated CMF is consistent with previous results in so far as they went, but our deeper map gives an improved completeness limit of 0.1 Mo (0.16 Jy), which enables us to show that a turnover exists in the low-mass regime of the CMF. The L1688 CMF shows the same form as the stellar IMF and can be mapped onto the stellar IMF, showing that the IMF is determined at the prestellar core stage. We compare L1688 with the Orion star-forming region and find that the turnover in the L1688 CMF occurs at a mass roughly a factor of two lower than the CMF turnover in Orion. This suggests that the position of the CMF turnover may be a function of environment.

11 Pages. Accepted by MNRAS

References in corpus (10)

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Cited by in corpus (7)

• Formation of Magnetized Prestellar Cores with Ambipolar Diffusion and Turbulence
• SCOPE: SCUBA-2 Continuum Observations of Pre-protostellar Evolution - Survey Description and Compact Source Catalogue
• On the fidelity of the core mass functions derived from dust column density data
• The IMF as a function of supersonic turbulence
• The JCMT Gould Belt Survey: First results from SCUBA-2 observations of the Cepheus Flare Region
• Source clustering in the Hi-GAL survey determined using a minimum spanning tree method
• Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex