PCA of H-band IFU pixel spectra decomposes cool stellar populations in NGC 5128 and NGC 5102, identifying M-giant, long-period variable, and carbon star contributions.
The effect of helium-enhanced stellar populations on the ultraviolet-upturn phenomenon of early-type galaxies
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abstract
Recent observations and modeling of globular clusters with multiple populations strongly indicate the presence of super helium-rich subpopulations in old stellar systems. Motivated by this, we have constructed new population synthesis models with and without helium-enhanced subpopulations to investigate their impact on the UV-upturn phenomenon of quiescent early-type galaxies. We find that our models with helium- enhanced subpopulations can naturally reproduce the strong UV-upturns observed in giant elliptical galaxies assuming an age similar to that of old globular clusters in the Milky Way. The major source of far-UV (FUV) flux, in this model, is relatively metal- poor and helium-enhanced hot horizontal branch stars and their progeny. The Burstein et al. (1988) relation of the F U V - V color with metallicity is also explained either by the variation of the fraction of helium-enhanced subpopulations or by the spread in mean age of stellar populations in early-type galaxies.
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Decomposing cool stellar populations with H-band spectral fluctuations: Long-period variable stars in NGC 5128 and carbon stars in NGC 5102
PCA of H-band IFU pixel spectra decomposes cool stellar populations in NGC 5128 and NGC 5102, identifying M-giant, long-period variable, and carbon star contributions.