Abstract:
We present XMM-Newton X-ray observations of nine confirmed lensed quasars at 1 z 3 identified by the
Gaia Gravitational Lens program. Eight systems are strongly detected, with 0.3–8.0 keV fluxes F0.3−8.0 5 ×
10−14 erg cm−2 s
−1
. Modeling the X-ray spectra with an absorbed power law, we derive power-law photon indices
and 2–10 keV luminosities for the eight detected quasars. In addition to presenting sample properties for larger quasar
population studies and for use in planning for future caustic-crossing events, we also identify three quasars of interest:
a quasar that shows evidence of flux variability from previous ROSAT observations, the most closely separated
individual lensed sources resolved by XMM-Newton, and one of the X-ray brightest quasars known at z > 3. These
sources represent the tip of the discoveries that will be enabled by SRG/eROSITA.
