The Geometry of the Universe from High Resolution VLBI Data of AGN Shocks

Details The Geometry of the Universe from High Resolution VLBI Data of AGN Shocks The Geometry of the Universe from High Resolution VLBI Data of AGN Shocks

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aprs.conf..253v&link_type=abstract

Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium, held at the Institute of Space and astronauti

Astronomy and Astrophysics

Astrophysics

Scientific paper

We propose to use the linear diameters of the shocks in AGN jets as standard rods for determining 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 the method by using a small sample of fourteen 22 GHz VLBI observations. The accuracy of the derived value, q_0 approximately equal to 0, compares favorably with traditional methods using much larger samples.

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