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arXiv · 2209.00761

Sub-percentage measure of distances to redshift of 0.1 by a new cosmic ruler

Yong Shi·Yanmei Chen·Shude Mao·Qiusheng Gu·Tao Wang·Xiaoyang Xia·Zhi-Yu Zhang
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Abstract

Distance-redshift diagrams probe expansion history of the Universe. We show that the stellar mass-binding energy (massE) relation of galaxies proposed in our previous study offers a new distance ruler at cosmic scales. By using elliptical galaxies in the main galaxy sample of the Sloan Digital Sky Survey Data Release 7, we construct a distance-redshift diagram over the redshift range from 0.05 to 0.2 with the massE ruler. The best-fit dark energy density is 0.675+-0.079 for flat Lambda-CDM, consistent with those by other probes. At the median redshift of 0.11, the median distance is estimated to have a fractional error of 0.34%, much lower than those by supernova (SN) Ia and baryonic acoustic oscillation (BAO) and even exceeding their future capability at this redshift. The above low-z measurement is useful for probing dark energy that dominates at the late Universe. For a flat dark energy equation of state model (flat wCDM), the massE alone constrains w to an error that is only a factor of 2.2, 1.7 and 1.3 times larger than those by BAO, SN Ia, and cosmic microwave background (CMB), respectively.

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Yong Shi, Yanmei Chen, Shude Mao, Qiusheng Gu, Tao Wang, Xiaoyang Xia, Zhi-Yu Zhang. 2022-09-02. Sub-percentage measure of distances to redshift of 0.1 by a new cosmic ruler. https://doi.org/10.1093/mnras%2Fstac2284

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