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A Universal Stellar Initial Mass Function? A Critical Look at Variations

Open access
Bastian, Nate, Covey, Kevin R., Meyer, Michael R.·2010·Annual Review of Astronomy and Astrophysics

Abstract

Whether the stellar initial mass function (IMF) is universal or is instead sensitive to environmental conditions is of critical importance: The IMF influences most observable properties of stellar populations and thus galaxies, and detecting variations in the IMF could provide deep insights into the star formation process. This review critically examines reports of IMF variations, with a view toward whether other explanations are sufficient given the evidence. Studies of the field, young clusters and associations, and old globular clusters suggest that the vast majority were drawn from a universal system IMF: a power law of Salpeter index (Γ = 1.35) above a few solar masses, and a log normal or shallower power law (Γ ∼ 0–0.25) for lower mass stars. The shape and universality of the substellar IMF is still under investigation. Observations of resolved stellar populations and the integrated properties of most galaxies are also consistent with a universal IMF, suggesting no gross variations over much of cosmic time. Indications of “nonstandard” IMFs in specific local and extragalactic environments clearly warrant further study. However, there is no clear evidence that the IMF varies strongly and systematically as a function of initial conditions after the first few generations of stars.

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Metadata

Authors
Bastian, N., Covey, K. R., & Meyer, M. R.
Venue
Annual Review of Astronomy and Astrophysics
Published
2010-08-01
Volume
48
Issue
1
Pages
339-389
ISSN
  • 0066-4146 (ISSN-L)
  • 1545-4282
OpenAlex
W2086095637
Cited by
1,004
References
6
FWCI
8.83
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A Universal Stellar Initial Mass Function? A Critical Look at Variations. https://app.cochat.ai/papers/10.1146/annurev-astro-082708-101642
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Bastian, N., Covey, K. R., & Meyer, M. R. (2010). A Universal Stellar Initial Mass Function? A Critical Look at Variations. Annual Review of Astronomy and Astrophysics. https://doi.org/10.1146/annurev-astro-082708-101642

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