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27 April 2024 |
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Article overview
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The Dark Side of Galaxy Color: evidence from new SDSS measurements of galaxy clustering and lensing | | Andrew P. Hearin
; Douglas F. Watson
; Matthew R. Becker
; Reinabelle Reyes
; Andreas A. Berlind
; Andrew R. Zentner
; | | Date: |
24 Oct 2013 | | Abstract: | The age matching model has recently been shown to predict correctly the
luminosity L and g-r color of galaxies residing within dark matter halos. The
central tenet of the model is intuitive: older halos tend to host galaxies with
older stellar populations. In this paper, we demonstrate that age matching also
correctly predicts the g-r color trends exhibited in a wide variety of
statistics of the galaxy distribution for stellar mass M* threshold samples. In
particular, we present new measurements of the galaxy two-point correlation
function and the galaxy-galaxy lensing signal as a function of M* and g-r color
from the Sloan Digital Sky Survey, and show that age matching exhibits
remarkable agreement with these and other statistics of low-redshift galaxies.
We describe how age matching is a specific example of a larger class of
Conditional Abundance Matching models (CAM), a theoretical framework we
introduce here for the first time. CAM provides a general formalism to study
correlations at fixed mass between any galaxy property and any halo property.
The striking success of our simple implementation of CAM provides compelling
evidence that this technique has the potential to describe the same set of data
as alternative models, but with a dramatic reduction in the required number of
parameters. CAM achieves this reduction by exploiting the capability of
contemporary N-body simulations to determine dark matter halo properties other
than mass alone, which distinguishes our model from conventional approaches to
the galaxy-halo connection. | | Source: | arXiv, 1310.6747 | | Services: | Forum | Review | PDF | Favorites | |
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