A new test of f(R) gravity with the cosmological standard rulers in radio quasars
نویسندگان
چکیده
منابع مشابه
The prevalence of FR I radio quasars
We present deep, multi-VLA-configuration radio images for a set of 18 quasars, having redshifts between 0.36 and 2.5, from the 7C quasar survey. Approximately one quarter of these quasars have FR I-type twin-jet structures and the remainder are a broad range of wide angle tail, fat double, classical double, core-jet and hybrid sources. These images demonstrate that FR I quasars are prevalent in...
متن کاملQuasars as Cosmological Standard Candles
We propose the use of quasars with accretion rate near the Eddington ratio (extreme quasars) as standard candles. The selection criteria are based on the Eigenvector 1 (E1) formalism. Our first sample is a selection of 334 optical quasar spectra from the SDSS DR7 database with a S/N > 20. Using the E1, we define primary and secondary selection criteria in the optical spectral range. We show tha...
متن کاملReconstructing Cosmological Matter Perturbations using Standard Candles and Rulers
For a large class of dark energy (DE) models, for which the effective gravitational constant is a constant and there is no direct exchange of energy between DE and dark matter (DM), knowledge of the expansion history suffices to reconstruct the growth factor of linearized density perturbations in the non-relativistic matter component on scales much smaller than the Hubble distance. In this pape...
متن کاملThe nuclear radio – optical properties of intermediate redshift FR II radio galaxies and quasars ⋆
We extend the study of the nuclei of 3CR objects as seen with the HST to higher redshift FR II radio sources (0.4 < z < 0.6). Our results reflect what has been found for FR II of lower redshift. The position of the nuclei on the plane formed by optical and radio luminosities is related to their optical spectral classification: the nuclei of both high and low excitation galaxies lie on the corre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2018
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2018/06/042