The DOI matches its Crossref record; 57 of the 57 references it cites were found in a registry or an index.
THE INITIAL MASS FUNCTION OF EARLY-TYPE GALAXIES
Open accessAbstract
We determine an absolute calibration of the initial mass function (IMF) of early-type galaxies, by studying a sample of 56 gravitational lenses identified by the Sloan Lenses ACS Survey. Under the assumption of standard Navarro, Frenk, and White dark matter halos, a combination of lensing, dynamical, and stellar population synthesis models is used to disentangle the stellar and dark matter contribution for each lens. We define an "IMF mismatch" parameter α≡ M LD *,Ein / M SPS *,Ein as the ratio of stellar mass inferred by a joint lensing and dynamical model ( M LD *,Ein ) to the current stellar mass inferred from stellar populations synthesis models ( M SPS *,Ein ). We find that a Salpeter IMF provides stellar masses in agreement with those inferred by lensing and dynamical models (〈log α〉 = −0.00 ± 0.03 ± 0.02), while a Chabrier IMF underestimates them (〈log α〉 = 0.25 ± 0.03 ± 0.02). A tentative trend is found, in the sense that α appears to increase with galaxy velocity dispersion. Taken at face value, this result would imply a non-universal IMF, perhaps dependent on metallicity, age, or abundance ratios of the stellar populations. Alternatively, the observed trend may imply non-universal dark matter halos with inner density slope increasing with velocity dispersion. While the degeneracy between the two interpretations cannot be broken without additional information, the data imply that massive early-type galaxies cannot have both a universal IMF and universal dark matter halos.
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Cites
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A Universal Density Profile from Hierarchical Clustering
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“However, the results presented in this paper do not change significantly if a gNFW halo with uniform prior on the inner slope is considered instead of a simple NFW. 2.2.”
InfluentialOn the variation of the initial mass function
Kroupa, P. (2001) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2001.04022.x · Cited by 7,499
A Universal Density Profile from Hierarchical ClusteringPreprint
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Cited by
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Dusty star-forming galaxies at high redshift
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Systematic variation of the stellar initial mass function in early-type galaxies
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Metadata
- Authors
- Treu, T., Auger, M. W., Koopmans, L. V. E., Gavazzi, R., Marshall, P. J., & Bolton, A. S.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2010-01-12
- Volume
- 709
- Issue
- 2
- Pages
- 1195-1202
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2100479967
- Cited by
- 406
- References
- 57
- FWCI
- 22.25
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Treu, T., Auger, M. W., Koopmans, L. V. E., Gavazzi, R., Marshall, P. J., & Bolton, A. S. (2010). THE INITIAL MASS FUNCTION OF EARLY-TYPE GALAXIES. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/709/2/1195
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