The time delay of gravitational lens 0957 + 561. I - Methodology and analysis of optical photometric data. II - Analysis of radio data and combined optical-radio analysis

Details The time delay of gravitational lens 0957 + 561. I - Methodology and analysis of optical photometric data. II - Analysis of radio data and combined optical-radio analysis The time delay of gravitational lens 0957 + 561. I - Methodology and analysis of optical photometric data. II - Analysis of radio data and combined optical-radio analysis

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..404p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 404-420.

Statistics

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108

Astronomical Photometry, Gravitational Lenses, Quasars, Time Lag, Computational Astrophysics, Galactic Clusters, Monte Carlo Method, Red Shift

Scientific paper

A method is reported which was developed for determining the time delay between two irregularly sampled data sets, based on an optical reconstruction that minimizes a global chi-squared, one which takes into account the relative strength of expected correlations of each data point with all others. It is concluded from the application of this method to published data that previous estimates based on optical data of the time delay between components A and B of the gravitational lens 0957 + 561 are incorrect: their quoted error bars are vastly underestimated. The method is extended and applied to the radio data of Lehar et al. (1992). For the radio data alone, the analysis yields the result tau-AB = 548 +19/-16 d. Combined analysis of the optical and radio data yield tau-AB of 540 +/-12 d.

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