NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, Wise-Selected Quasars at Z Is Approximately 2

摘要: We report on a NuSTAR and XMM-Newton program that has observed sample of three extremely luminous, heavily obscured WISE-selected active galactic nuclei (AGNs) at z (is) approximately 2 across broad X-ray band (0.1 79 keV). The parent sample, selected to be faint or undetected in the WISE 3.4 micrometers (W1) 4.6 (W2) bands but bright 12 (W3) 22 (W4), are rare, with only 1000 so-called "W1W2-dropouts" extragalactic sky. Optical spectroscopy reveals typical redshifts for this population, implying rest-frame mid-IR luminosities L(6 micrometers) 610(exp 46) erg s1 bolometric can exceed L(sub bol) 10(exp 14) L solar luminosity. corresponding intrinsic, unobscured hard L(2-10 keV) 4 10( exp 45) quasar templates. These among most AGNs known, though optical spectra rarely show evidence broad-line region selection criteria imply heavy obscuration even 1 micrometers. designed our observations obtain robust detections gas column densities NH less than 24) cm2. In fact, sources prove fainter these predictions. Two were by both XMM-Newton, neither being detected (f3-24 keV -13) cm2 s1), one faintly (f(sub 0).5-10 5 -15) cm(exp -2) s1). A third source was yielding detection (f0.5-10 7 data either weak, 1024 combined analysis seems favor second possibility, obscured, consistent Compton-thick, luminous quasars. discovery significant population would not conform standard paradigm receding torus, which more quasars likely instead suggests an additional is present extreme