Dark energy and the angular size - redshift diagram for milliarcsecond radio sources

Abstract

We investigate observational constraints on the cosmic equation of state from measurements of angular size for a large sample of milliarcsecond compact radio sources. The results are based on a flat Friedmann-Robertson-Walker (FRW) type models driven by non-relativistic matter plus a smooth dark energy component parametrized by its equation of state $p_x=\omega {\rho }_x$ ($-1\le \omega <0$). The allowed intervals for $\omega$ and ${\Omega }_{\mathrm{m}}$ are heavily dependent on the value of the mean projected linear size $l$. For $l\simeq 20h^{-1}-30h^{-1}$ pc, we find ${\Omega }_{\mathrm{m}}\le 0.62$, $\omega \le -0.2$ and ${\Omega }_{\mathrm{m}}\le 0.17$, $\omega \le -0.65$ (68% c.l.), respectively. As a general result, this analysis shows that if one minimizes ${\chi }^2$ for the parameters $l$, ${\Omega }_{\mathrm{m}}$ and $\omega$, the conventional flat $\Lambda$CDM model ($\omega =-1$) with ${\Omega }_{\mathrm{m}}=0.2$ and $l=22.6h^{-1}$pc is the best fit for these angular size data.

11 pages, 2 figures, accepted for publication in ApJ (minor corrections)

References in corpus (7)

• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• Consequences on variable Lambda-models from distant Type Ia supernovae and compact radio sources
• Constraining the cosmic equation of state from old galaxies at high redshift
• Deceleration without dark matter
• Dark energy and the epoch of galaxy formation
• Implications for quintessence models from MAXIMA-1 and BOOMERANG-98
• The determination of the age of Globular Clusters: a statistical approach

Cited by in corpus (65)

• The Cosmological Constant and Dark Energy
• Cosmological consequences of a Chaplygin gas dark energy
• A Model-Independent Determination of the Expansion and Acceleration Rates of the Universe as a Function of Redshift and Constraints on Dark Energy
• A model independent approach to the dark energy equation of state
• Testing dark energy beyond the cosmological constant barrier
• Testing the Distance-Duality Relation with Galaxy Clusters and Type Ia Supernovae
• Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to $z\sim 3$
• Baryon acoustic oscillation, Hubble parameter, and angular size measurement constraints on the Hubble constant, dark energy dynamics, and spatial curvature
• Prospects for Determining the Equation of State of the Dark Energy: What can be Learned from Multiple Observables?
• Constraining the dark energy with galaxy clusters X-ray data
• Cosmic Distance Duality Relation and the Shape of Galaxy Clusters
• On the Geometry of Dark Energy
• Cardassian Expansion: Constraints from Compact Radio Source Angular Size versus Redshift Data
• Measuring the speed of light with ultra-compact radio quasars
• Cosmological constraints on Chaplygin gas dark energy from galaxy clusters X-ray and supernova data
• Some Observational Consequences of Brane World Cosmologies
• Cosmic acceleration vs axion-photon mixing
• Cosmological Constraints from Compact Radio Source Angular Size versus Redshift Data
• Constraints on Cardassian Expansion from Distant type Ia Supernovae
• Probing the Cosmic Distance Duality Relation with the Sunyaev-Zeldovich Effect, X-rays Observations and Supernovae Ia
• The distance sum rule from strong lensing systems and quasars - test of cosmic curvature and beyond
• Confronting Dark Energy Models using Galaxy Cluster Number Counts
• Constraining Van der Waals quintessence by observations
• New observational constraints on $f(T)$ cosmology from radio quasars
• Model-independent constraints on the cosmic opacity
• Radio Galaxy Redshift-Angular Size Data Constraints on Dark Energy
• The value of the equation of state of dark energy
• Cosmological constraints from higher-redshift gamma-ray burst, HII starburst galaxy, and quasar (and other) data
• Implication of Dark Energy Parametrizations on the Determination of the Curvature of the Universe
• Deformed Distance Duality Relations and Supernovae Dimming
• A new test of $f(R)$ gravity with the cosmological standard rulers in radio quasars
• Testing cosmic opacity from SNe Ia and Hubble parameter through three cosmological-model-independent methods
• Testing the Etherington's distance duality relation at higher redshifts: the combination of radio quasars and gravitational waves
• Constraining the dark energy models with H(z) data: an approach independent of $H_0$
• Determining the equation of state of dark energy from angular size of compact radio sources and X-ray gas mass fraction of galaxy clusters
• Exploring the properties of milliarcsecond radio sources
• Testing Einstein's gravity and dark energy with growth of matter perturbations: Indications for new Physics?
• The angular size - redshift relation in power-law cosmologies
• Tight Cosmological Constraints from the Angular-Size/Redshift Relation for Ultra-Compact Radio Sources
• Measuring the Chaplygin gas equation of state from angular and luminosity distances
• Can Old Galaxies at High Redshifts and Baryon Acoustic Oscillations Constrain H_0?
• Cosmological constraints from HII starburst galaxy, quasar angular size, and other measurements
• Clustering, Angular Size and Dark Energy
• High-resolution images of five radio quasars at early cosmological epochs
• Cosmological Tests Using the Angular Size of Galaxy Clusters
• Galaxy cluster angular size data constraints on dark energy
• Deflationary cosmology: constraints from angular size and ages of globular clusters
• A 3% Determination of $H_0$ at Intermediate Redshifts
• On tidal forces in f(R) theories of gravity
• The Maximum Angular-Diameter Distance in Cosmology
• Constraining H0 in General Dark Energy Models from Sunyaev-Zeldovich/X-ray Technique and Complementary Probes
• Current lookback time-redshift bounds on dark energy
• Model-independent way to determine the Hubble constant and the curvature from phase shift of gravitational waves with DECIGO
• Phantom Accretion by Black Holes and the Generalized Second Law of Thermodynamics
• Constraints on the duality relation from ACT cluster data
• Flat Cosmology with Coupled Matter and Dark Energies
• Comment on "Constraining the smoothness parameter and dark energy using observational H(z) data"
• Model Selection based on the Angular-Diameter Distance to the Compact Structure in Radio Quasars
• Cosmic Acceleration and Geodesic Deviation in Chameleon Scalar Field Model
• Geometrical tests of cosmological models. I. Probing dark energy using the kinematics of high-redshift galaxies
• On a class of scaling FRW cosmological models
• Analytical considerations about the cosmological constant and dark energy
• Geodesic deviation equation in generalized hybrid Metric-Palatini gravity
• Interacting galaxies and cosmological parameters
• Revisiting the angular size-redshift cosmological test with milliarcsecond radio structures in active galactic nuclei