New constraint of the Hubble constant by proper motions of radio components observed in AGN twin-jets
| Autor: | Yi-Ping Qin, Wei-Jian Lu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cold dark matter Astrophysics::High Energy Astrophysical Phenomena Cosmic distance ladder Cosmic microwave background FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Lambda Astrophysics - Astrophysics of Galaxies Measure (mathematics) Cosmology Constraint (information theory) symbols.namesake Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) symbols Hubble's law |
| Zdroj: | Research in Astronomy and Astrophysics. 21:261 |
| ISSN: | 1674-4527 |
| DOI: | 10.1088/1674-4527/21/10/261 |
| Popis: | As the advent of precision cosmology, the Hubble constant ($H_0$) 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-Lema\^itre-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 the $H_{\rm 0,min}=51.5\pm2.3\,\rm km\,s^{-1}\,Mpc^{-1}$ from the measured maximum proper motions of the radio components observed in the twin-jet of NGC 1052. Comment: 6 pages, 2 figures, accepted for publication on RAA |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|