Zoghbi, A.3; Miller, J. M.3; Walton, D. J.9; Harrison, F. A.9; Fabian, A. C.5; Reynolds, C. S.5; Boggs, S. E.6; Christensen, Finn Erland1; Craig, W.6; Hailey, C. J.10; Stern, D.9; Zhang, W. W.11
1 National Space Institute, Technical University of Denmark2 Astrophysics, National Space Institute, Technical University of Denmark3 University of Michigan4 California Institute of Technology5 University of Cambridge6 University of California at Berkeley7 Columbia University8 NASA Goddard Space Flight Center9 California Institute of Technology10 Columbia University11 NASA Goddard Space Flight Center
We report on four epochs of observations of the quasar PG 1211+143 using NuSTAR. The net exposure time is 300 ks. Prior work on this source found suggestive evidence of an ultra-fast outflow ( UFO) in the Fe K band with a velocity of approximately 0.1c. The putative flow would carry away a high-mass flux and kinetic power, with broad implications for feedback and black hole-galaxy co-evolution. NuSTAR detects PG 1211+143 out to 30 keV, meaning that the continuum is well-defined both through and above the Fe K band. A characteristic relativistic disk reflection spectrum is clearly revealed via a broad Fe K emission line and Compton back-scattering curvature. The data offer only weak constraints on the spin of the black hole. A careful search for UFOs shows no significant absorption feature above 90% confidence. The limits are particularly tight when relativistic reflection is included. We discuss the statistics and the implications of these results in terms of connections between accretion onto quasars, Seyferts, and stellar-mass black holes, and feedback into their host environments.