Dark energy and the angular size: Redshift diagram for milliarcsecond radio sources - INSPIRE

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Dark energy and the angular size: Redshift diagram for milliarcsecond radio sources

Sep, 2001

4 pages

Published in:

Astrophys.J. 566 (2002) 15

e-Print:

astro-ph/0109047 [astro-ph]

DOI:

10.1086/337986

View in:

ADS Abstract Service

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Abstract: (arXiv)

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 \leq \omega < 0

). The allowed intervals for

\omega

and

\Omega_{\rm{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_{\rm{m}} \leq 0.62

,

\omega \leq -0.2

and

\Omega_{\rm{m}} \leq 0.17

,

\omega \leq -0.65

(68% c.l.), respectively. As a general result, this analysis shows that if one minimizes

\chi^{2}

for the parameters

l

,

\Omega_{\rm{m}}

and

\omega

, the conventional flat

\Lambda

CDM model (

\omega = -1

) with

\Omega_{\rm{m}} = 0.22

and

l = 22.6 h^{-1}

pc is the best fit for these angular size data.

Note:

4 pages, 2 figures, LaTeX

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