Gravitationally lensed quasar Q0957+561AB in outburst

Details Gravitationally lensed quasar Q0957+561AB in outburst Gravitationally lensed quasar Q0957+561AB in outburst

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2975g&link_type=abstract

Chandra proposal ID #10708333

Physics

Scientific paper

Q0957+561AB consists of two images, A and B, separated by 6 arcsec, of a single quasar at z = 1.41. Optical monitoring of the lensed quasar showed that the g-band flux of the leading image A increased 30% over about 130 days. Taking the time delay into account, it is expected a similar g-band brightening of the trailing image B in the first semester of 2010 (see ATel#2228 on 5 Oct 2009). Thus, a multiwavelength follow-up of this system over 2010 offers a unique opportunity to study the involved mechanism of variability. There is clear evidence that UV/optical variability of local AGN on restframe timescales < 100 d is mainly driven by X-ray/EUV fluctuations that are generated close to the accretion disc axis (reverberation scenario). Chandra observations of Q0957+561B will allow us to check if the expected optical event is triggered (and thus preceded) by an X-ray flare. We want to confirm the reverberation scenario in a non-local (z > 1) AGN for first time.

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