A substantial population of low-mass stars in luminous elliptical galaxies

@article{Dokkum2010ASP,
  title={A substantial population of low-mass stars in luminous elliptical galaxies},
  author={P. Dokkum and C. Conroy},
  journal={Nature},
  year={2010},
  volume={468},
  pages={940-942}
}
The stellar initial mass function (IMF) describes the mass distribution of stars at the time of their formation and is of fundamental importance for many areas of astrophysics. The IMF is reasonably well constrained in the disk of the Milky Way but we have very little direct information on the form of the IMF in other galaxies and at earlier cosmic epochs. Here we report observations of the Na i doublet and the Wing–Ford molecular FeH band in the spectra of elliptical galaxies. These lines are… Expand
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TLDR
A study of the two-dimensional stellar kinematics for the large representative ATLAS3D sample of nearby early- type galaxies spanning two orders of magnitude in stellar mass, using detailed dynamical models finds a strong systematic variation in IMF in early-type galaxies as a function of their stellar mass-to-light ratios, implying that a galaxy’s IMF depends intimately on the galaxy's formation history. Expand
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The stellar populations of massive galaxies in the local Universe
  • R. McDermid
  • Physics
  • Proceedings of the International Astronomical Union
  • 2012
Abstract I present a brief review of the stellar population properties of massive galaxies, focusing on early-type galaxies in particular, with emphasis on recent results from the ATLAS3D Survey. IExpand
Strong gravitational lensing and the stellar IMF of early-type galaxies
Systematic variations of the initial mass function (IMF) in early-type galaxies, and their connection with possible drivers such as velocity dispersion or metallicity, have been much debated inExpand
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References

SHOWING 1-10 OF 66 REFERENCES
Evidence of Cosmic Evolution of the Stellar Initial Mass Function
Theoretical arguments and indirect observational evidence suggest that the stellar IMF may evolve with time, such that it is more weighted toward high-mass stars at higher redshift. Here we test thisExpand
On the evolutionary history of stars and their fossil mass and light
The total extragalactic background radiation can be an important test of the global star formation history (SFH). Using direct observational estimates of the SFH, along with standard assumptionsExpand
Formation of Early-Type Galaxies from Cosmological Initial Conditions
We describe high-resolution smoothed particle hydrodynamics (SPH) simulations of three approximately M* field galaxies starting from ΛCDM initial conditions. The simulations are made intentionallyExpand
Can the faint submillimetre galaxies be explained in the Λ cold dark matter model
We present predictions for the abundance of submillimetre galaxies (SMGs) and Lyman-break galaxies (LBGs) in the Λ cold dark matter cosmology. A key feature of our model is the self-consistentExpand
The Stellar Population Histories of Local Early-Type Galaxies. I. Population Parameters
This paper commences a series of investigations into the stellar populations of local elliptical galaxies as determined from their integrated spectra. The goal of the series is to determine the starExpand
The Low-Mass Stellar Content of Galaxies: Constraints through Hybrid Population Synthesis near 1 Micron
We present high signal-to-noise observations obtained with the RC spectrograph at the CTIO 4 m telescope of six galaxies and of a variety of dwarfs and galactic bulge giants in the 9800-10200 AExpand
Accurate masses of very low mass stars: IV Improved mass-luminosity relations
We present improved visual and near-infrared empirical mass-luminosity relations for very low mass stars (M$<$0.6~\Msol). These relations make use of all stellar masses in this range known withExpand
The Epochs of Early-Type Galaxy Formation as a Function of Environment
The aim of this paper is to set constraints on the epochs of early-type galaxy formation through the archaeology of the stellar populations in local galaxies. Using our models of absorption-lineExpand
On the variation of the initial mass function
A universal initial mass function (IMF) is not intuitive, but so far no convincing evidence for a variable IMF exists. The detection of systematic variations of the IMF with star-forming conditionsExpand
The Initial Mass Function of Early-Type Galaxies
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 theExpand
...
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