Vol 21, No 10 (2021) / Lu(陆伟坚)

New constraint of the Hubble constant by proper motions of radio components observed in AGN twin-jets

Wei-Jian Lu(陆伟坚), Yi-Ping Qin(覃一平)

Abstract

As the advent of precision cosmology, the Hubble constant (H0) inferred from the Lambda Cold Dark Matter fit to the Cosmic Microwave Background data is increasingly in tension with the measurements from the local distance ladder. To approach its real value, we need more independent methods to measure, or to make constraint of, the Hubble constant. In this paper, we apply a plain method, which is merely based on the Friedman-Lemaître-Robertson-Walker cosmology together with geometrical relations, to constrain the Hubble constant by proper motions of radio components observed in AGN twin-jets. Under the assumption that the ultimate ejection strengths in both sides of the twin-jet concerned are intrinsically the same, we obtain a lower limit of H0,min = 51.5 ± 2.3 km s−1 Mpc−1 from the measured maximum proper motions of the radio components observed in the twin-jet of NGC 1052.

Keywords


(cosmology:) cosmological parameters — cosmology: observations — galaxies: active — galaxies: jets

Full Text:

PDF


DOI: https://doi.org/10.1088/1674-4527/21/10/261

Refbacks

  • There are currently no refbacks.