Intrinsic intraday variability in the gravitational lens system B0218+357

Details Intrinsic intraday variability in the gravitational lens system B0218+357 Intrinsic intraday variability in the gravitational lens system B0218+357

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205...94b&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

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Scientific paper

Radio monitoring of the gravitational lens system B0218+357 has been performed with the VLA in order to determine the time delay between the two images of the flat-spectrum radio core. These observations reveal flux density variations on timescales of a few days that not only have allowed an accurate time delay to be measured (10.5±0.4 d), but which show that the lensed object belongs to the class of so-called ``intraday variables''. The cause of the variations seen in these sources is currently controversial with claims being made for either an intrinsic or extrinsic origin. For this lens system, however, as the flux density variations are highly correlated in both images we can be confident of an intrisic origin in this case. By implication this suggests that similar variations in other intraday variable sources are also intrinsic in origin.

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