Evidence for a Turnover in the IMF of Low Mass Stars and Sub-stellar Objects: Analysis from an Ensemble of Young Clusters

Abstract

We present a combined analysis of the low-mass Initial Mass Function (IMF) for seven star forming regions. We first demonstrate that the ratios of stars to brown dwarfs are consistent with a single underlying IMF. Assuming the underlying IMF is the same for all seven clusters and by combining the ratio of stars to brown dwarfs from each cluster we constrain the shape of the brown dwarf IMF and find it to be consistent with a log--normal IMF. This provides the strongest constraint yet that the sub-stellar IMF turns over (dN/dM M^(-alpha), alpha < 0).

12 pages, 2 figures. Accepted in ApJ Letters Revised version have Column 7 modified from previous versions and gramatical errors have been corrected

References in corpus (7)

• Analytical theory for the initial mass function: CO clumps and prestellar cores
• The Stellar Population of the Chamaeleon I Star-Forming Region
• The minimum mass for star formation, and the origin of binary brown dwarfs
• The Jeans mass and the origin of the knee in the IMF
• The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk: I. The Calibration Region
• Low Mass Stars and Brown Dwarfs in NGC 2024: Constraints on the Substellar Mass Function
• NICMOS/HST Observations of the Embedded Cluster Associated with Mon R2: Constraining the sub-stellar Initial Mass Function

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