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- W4384652203 abstract "We report hbox{XMM-Newton} observations of two examples of an unclassified type of hbox{X-ray} weak quasars from the citet{2020ApJ...900..141P} survey of hbox{X-ray} weak quasars in the Chandra archive, SDSS J083116.62+321329.6 at $z=1.797$ and SDSS J142339.87+042041.1 at $z=1.702$. They do not belong to the known populations of hbox{X-ray} weak quasars that show broad absorption lines, weak ultraviolet (UV) broad emission lines, or red optical/UV continua. Instead, they display typical quasar UV spectra and spectral energy distributions. In the hbox{XMM-Newton} observations, both quasars show nominal levels of hbox{X-ray} emission with typical quasar hbox{X-ray} spectral shapes (hbox{power-law} photon indices of $1.99^{+0.27}_{-0.23}$ and $1.86^{+0.15}_{-0.14}$), displaying strong hbox{X-ray} variability compared to the archival Chandra data (variability factors of $4.0^{+1.6}_{-1.4}$ and $9.0^{+7.4}_{-3.8}$ in terms of the 2 keV flux density). Simultaneous optical (rest-frame UV) spectra indicate no strong variability compared to the archival spectra. Long-term optical/UV and infrared light curves do not show any substantial variability either. We consider that the hbox{X-ray} weakness observed in the Chandra data is due to hbox{X-ray} obscuration from a small-scale dust-free absorber, likely related to accretion-disk winds. Such hbox{X-ray} weak/absorbed states are probably rare in typical quasars, and thus both targets recovered to hbox{X-ray} nominal-strength states in the hbox{XMM-Newton} observations." @default.
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- W4384652203 date "2023-07-14" @default.
- W4384652203 modified "2023-09-27" @default.
- W4384652203 title "XMM-Newton Observations of Two Archival X-ray Weak Type 1 Quasars: Obscuration Induced X-ray Weakness and Variability" @default.
- W4384652203 doi "https://doi.org/10.48550/arxiv.2307.07554" @default.
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