CCD Photometry of QSO 0957+561 A & B for the period 1987-1992 using La Palma archive

Details CCD Photometry of QSO 0957+561 A & B for the period 1987-1992 using La Palma archive CCD Photometry of QSO 0957+561 A & B for the period 1987-1992 using La Palma archive

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.275..385s&link_type=abstract

Astrophysics and Space Science, v. 275, Issue 4, p. 385-389 (2001).

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

We present the results of CCD photometry of the first gravitational lens system QSO 0957+561, obtained on the base of La Palma archive. Using cross-correlation analysis we have found the time delay between A and B quasar images to be 430 +/- 15 days. Our photometry of QSO 0957+561 A & B gives additional independent confirmation of the recent results on the time delay about 425 days.

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