| Issue |
A&A
Volume 366, Number 3, February II 2001
|
|
|---|---|---|
| Page(s) | 1061 - 1064 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361:20000285 | |
| Published online | 15 February 2001 | |
The geometry of the universe from high resolution VLBI data of AGN shocks
Tuorla Observatory, Väisäläntie 20, 21500 Piikkiö, Finland
Corresponding author: K. Wiik, kaj.wiik@iki.fi
Received:
8
September
2000
Accepted:
16
November
2000
We propose to use the linear diameters of the shocks in AGN jets as
standard rods for estimating the geometry of the Universe. The unique
feature of shocks is that we can directly estimate their linear
diameters from total flux density monitoring data and light travel time
arguments. We demonstrate this method by using a small sample of 14 22
GHz VLBI observations. The accuracy of the derived values (
) compares favorably with traditional methods
using much larger samples.
Key words: cosmology: observations / galaxies: jets / galaxies: active
© ESO, 2001
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