Fluctuation Spectroscopy: A New Probe of Old Stellar Populations

@article{Dokkum2014FluctuationSA,
  title={Fluctuation Spectroscopy: A New Probe of Old Stellar Populations},
  author={P. V. Dokkum and C. Conroy},
  journal={arXiv: Astrophysics of Galaxies},
  year={2014}
}
We introduce a new method to determine the relative contributions of different types of stars to the integrated light of nearby early-type galaxies. As is well known, the surface brightness of these galaxies shows pixel-to-pixel fluctuations due to Poisson variations in the number of giant stars. Differential spectroscopy of pixels as a function of fluctuation strength ("fluctuation spectroscopy") effectively measures the spectral variation of stars as a function of their luminosity… Expand
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