Upper panel: spectra of the variable quasar SDSS 154757.71+060626.6 (Scaringi et al. 2009) in May 25, 2011 (black), and in October 6, 2004 (red). Bottom panel: same quasar spectra convolved with Gaia’s low-resolution instrument including noise and a sequence of five single-field-of-view observations. Gaia can easily detect such strong variability.
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