Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix

The evolution of differential ages of passive galaxies at different redshifts (cosmic chronometers) has been proved to be a method potentially able to constrain the Hubble parameter in a cosmology-independent way, but the systematic uncertainties must be carefully evaluated. In this paper, we compute the contribution to the full covariance matrix of systematic uncertainties due to the choice of initial mass function, stellar library, and metallicity, exploring a variety of stellar population synthesis models; the effect of a residual young component and star formation history was discussed elsewhere. Through simulations in the redshift range 0

Keywords:

• Astrophysics
• Residual
• Physics
• Stellar population
• Hubble's law
• Star formation
• Astronomy
• Galaxy
• Metallicity
• Initial mass function
• Redshift

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