| Title: |
Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars. |
| Authors: |
Connor, Thomas, Stern, Daniel, Krone-Martins, Alberto, Djorgovski, S. G., Graham, Matthew J., Walton, Dominic J., Delchambre, Ludovic, Ducourant, Christine, Teixeira, Ramachrisna, Campion, Jean-François Le, den Brok, Jakob Sebastian, Dobie, Dougal, Galluccio, Laurent, Jalan, Priyanka, Klioner, Sergei A., Klüter, Jonas, Mahabal, Ashish A., Negi, Vibhore, Nierenberg, Anna, Petit, Quentin |
| Source: |
Astrophysical Journal; 3/1/2022, Vol. 927 Issue 1, p1-11, 11p |
| Subject Terms: |
QUASARS, X-ray spectra, GRAVITATIONAL lenses, POWER spectra, X-ray astronomy |
| 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 0.3â€"8.0 keV fluxes F 0.3â'8.0 ≳ 5 Ă—10â'14 erg cmâ'2 sâ'1. Modeling the X-ray spectra with an absorbed power law, we derive power-law photon indices and 2â€"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. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
