Quasar Parallax

Details Quasar Parallax Quasar Parallax

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20112311k&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #123.11; Bulletin of the American Astronomical Society, Vol. 34, p.1306

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Scientific paper

Recent distance measurements using the brightness of supernovae of type 1a as `standard candles' suggest that the universe has a non-zero cosmological constant, Λ . An independent confirmation of such an important measurement is clearly important. Here we propose a method, equivalent to geometric parallax, to determine distances to radio-quiet quasars. Quasar Broad Emission Line Regions (BELRs) sizes provide a `meter rule' with which to measure the metric of the Universe. We present a new approach for determining distances to quasars using a time delay method for estimating the linear sizes of BELRs (reverberation mapping) combined with interferometric measurements of their angular sizes. By measuring the BELRs `angular diameter' to a series of quasars at different redshifts the `angular diameter distance', can be mapped out against redshift. The resulting angular-diameter vs. redshift relation is a basic characteristic of the space-time metric of the Universe. From this relation we can determine Λ . We discuss feasibility issues related to reverberation mapping and angular measurements using long baseline interferometers from X-ray to IR wavelengths. This work was supported in part by NASA contract NAS8-39073 (Chandra X-ray Center).

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