On the Evolution of the Dense Core Mass Function

Abstract

The mass distributions of dense cores in star-forming regions are measured to have a shape similar to the initial mass function of stars. This has been generally interpreted to mean that the constituent cores will form individual stars or stellar systems at a nearly constant star formation efficiency. This article presents a series of numerical experiments evolving distributions of dense cores into stars to quantify the effects of stellar multiplicity, global core fragmentation, and a varying star formation efficiency. We find that the different evolutionary schemes have an overall small effect on the shape of the resultant distribution of stars. Our results imply that at the current level of observational accuracy the comparison between the mass functions of dense cores and stars alone is insufficient to discern between different evolutionary models. Observations over a wide range of mass scales including the high or low-mass tails of these distributions have the largest potential for discerning between different core evolutionary schemes.

6 pages, 3 figures, ApJ accepted

References in corpus (22)

• Galactic Stellar and Substellar Initial Mass Function
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• Interstellar Turbulence I: Observations and Processes
• The Stellar IMF from Turbulent Fragmentation
• From Molecular Cores to Planet-forming Disks: A SIRTF Legacy Program
• The mass function of dense molecular cores and the origin of the IMF
• Efficiencies of Low-Mass Star and Star Cluster Formation
• Star formation in clusters: a survey of compact mm-wave sources in the Serpens core
• The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure
• The Large and Small Scale Structures of Dust in the Star-Forming Perseus Molecular Cloud
• On the Density Probability Function of Galactic Gas. I. Numerical Simulations and the Significance of the Polytropic Index
• A SCUBA survey of Orion, the low-mass end of the core mass function
• Supersonic turbulence in the ISM: stellar extinction determinations as probes of the structure and dynamics of dark clouds
• The initial conditions of star formation in the Ophiuchus main cloud: Kinematics of the protocluster condensations
• Comparing Star Formation on Large Scales in the c2d Legacy Clouds: Bolocam 1.1 mm Dust Continuum Surveys of Serpens, Perseus, and Ophiuchus
• Dynamics of Dense Cores in the Perseus Molecular Cloud
• Limits on the primordial stellar multiplicity
• Current Star Formation in the Perseus Molecular Cloud: Constraints from Unbiased Submillimeter and Mid-Infrared Surveys
• Clump Lifetimes and the Initial Mass Function
• A Large Scale Survey of NGC1333
• The Spitzer c2d Survey of Nearby Dense Cores: IV. Revealing the Embedded Cluster in B59
• High Mass Star Formation. III. The Functional Form of the Submillimeter Clump Mass Function

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• The unexpectedly large proportion of high-mass star-forming cores in a Galactic mini-starburst
• Luminosity Functions of Spitzer Identified Protostars in Nine Nearby Molecular Clouds
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• Dense Cores in Perseus: The Influence of Stellar Content and Cluster Environment
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• Dense cores in the Pipe Nebula: An improved core mass function
• The structure of molecular clouds and the universality of the clump mass function
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• The initial conditions of star formation VIII: an observational study of the Ophiuchus cloud L1688 and implications for the prestellar core mass function
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• The properties of SCUBA cores in the Perseus molecular cloud: the bias of clump-finding algorithms
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• Molecular Clouds in the North American and Pelican Nebulae: Structures
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• Prestellar and protostellar cores in Ori B9
• Fragmentation in the Massive Star-Forming Region IRAS 19410+2336
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• A submillimetre survey of the kinematics of the Perseus molecular cloud - III. Clump kinematics
• On the shape of the mass-function of dense clumps in the Hi-GAL fields. I. SED determination and global properties of the mass-functions
• Origin of the dense core mass function in contracting filaments
• Star-forming gas in young clusters
• Similarity between the C18O (J=1-0) core mass function and the IMF in the S 140 region
• Mass distributions of stars and cores in young groups and clusters
• Connecting the Dots: Analyzing Synthetic Observations of Star-Forming Clumps in Molecular Clouds
• Not so different after all: Properties and Spatial Structure of Column Density Peaks in the Pipe and Orion A Clouds
• Collapse and Fragmentation of Molecular Cloud Cores. X. Magnetic Braking of Prolate and Oblate Cores
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• A Guide to Comparisons of Star Formation Simulations with Observations
• Low-mass Star Formation: Observations