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- W3101870030 endingPage "045" @default.
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- W3101870030 abstract "We present a new methodology to determine the expansion history of the Universe analyzing the spectral properties of early-type galaxies (ETG), based on the study of the redshift dependence of the 4000 Å break. In this paper we describe the method, explore its robustness using theoretical synthetic stellar population models, and apply it using a SDSS sample of ∼ 14 000 ETGs. Our motivation to look for a new technique has been to minimize the dependence of the cosmic chronometer method on systematic errors. In particular, as a test of our method, we derive the value of the Hubble constant H0 = 72.6 ±2.9(stat)±2.3(syst) km Mpc-1s-1(68% confidence), which is not only fully compatible with the value derived from the Hubble key project, but also with a comparable error budget. Using the SDSS, we also derive, assumingw = constant, a value for the dark energy equation of state parameter w = -1 ±0.2(stat)±0.3(syst). Given the fact that the SDSS ETG sample only reachesz ∼ 0.3, this result shows the potential of the method. In future papers we will present results using the high-redshift universe, to yield a determination of H(z) up to z ∼ 1." @default.
- W3101870030 created "2020-11-23" @default.
- W3101870030 creator A5004695575 @default.
- W3101870030 creator A5032579510 @default.
- W3101870030 creator A5090420192 @default.
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- W3101870030 date "2011-03-28" @default.
- W3101870030 modified "2023-09-30" @default.
- W3101870030 title "Constraining the expansion rate of the Universe using low-redshift ellipticals as cosmic chronometers" @default.
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- W3101870030 doi "https://doi.org/10.1088/1475-7516/2011/03/045" @default.
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