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Finding the necessary negative feedback

The evolution of galaxies seems to be tied to the growth of the supermassive black holes at their centers, but it's not entirely clear why. Models have suggested a mechanism in which the growth of the black hole results in an outflow of gas that interrupts star formation. However, evidence for enough of this negative feedback has been lacking. Nardini et al. now see a signature in x-ray spectra of a strong persistent outflow in the quasar PDS 456. They estimate a broad solid angle spanned by the wind that enables a far greater impact on the host galaxy than narrower jet outflows.
Science, this issue p. 860

Abstract

The evolution of galaxies is connected to the growth of supermassive black holes in their centers. During the quasar phase, a huge luminosity is released as matter falls onto the black hole, and radiation-driven winds can transfer most of this energy back to the host galaxy. Over five different epochs, we detected the signatures of a nearly spherical stream of highly ionized gas in the broadband x-ray spectra of the luminous quasar PDS 456. This persistent wind is expelled at relativistic speeds from the inner accretion disk, and its wide aperture suggests an effective coupling with the ambient gas. The outflow’s kinetic power larger than 1046 ergs per second is enough to provide the feedback required by models of black hole and host galaxy coevolution.
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Supplementary Material

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References (2863)

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Published In

Science
Volume 347 | Issue 6224
20 February 2015

Submission history

Received: 25 July 2014
Accepted: 20 January 2015
Published in print: 20 February 2015

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Acknowledgments

This research was supported under the U.K. Science and Technology Facilities Council grant ST/J001384/1 and is based on x-ray observations obtained with the XMM-Newton and NuSTAR satellites. XMM-Newton is a European Space Agency (ESA) science mission with instruments and contributions directly funded by ESA member states and the National Aeronautics and Space Administration. The NuSTAR mission is a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by NASA. We thank the NuSTAR Operations, Software, and Calibration teams for support with execution and analysis of these observations. We also acknowledge financial support from the Italian Space Agency under grant ASI-INAF I/037/12/0 (G.R. and G.M.); the Italian National Institute for Astrophysics under grant PRIN-INAF 2012 (G.R.); the I-CORE program of the Planning and Budgeting Committee, the Israel Science Foundation under grants 1937/12 and 1163/10, Israel’s Ministry of Science and Technology (E.B.); and NASA under grants NNX11AJ57G and NNG08FD60C (T.J.T.). The data are stored in the science archives of the two x-ray observatories involved and will become publicly available on 25 March 2015 (XMM-Newton) and with the upcoming DR6 data release (NuSTAR).

Authors

Affiliations

Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK.
J. N. Reeves
Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK.
Center for Space Science and Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.
J. Gofford
Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK.
Center for Space Science and Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.
F. A. Harrison
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA.
G. Risaliti
Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Firenze, Italy.
Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
V. Braito
INAF, Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate (LC), Italy.
M. T. Costa
Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK.
G. A. Matzeu
Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK.
D. J. Walton
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA.
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
E. Behar
Department of Physics, Technion, Haifa 32000, Israel.
S. E. Boggs
Space Science Laboratory, University of California, Berkeley, CA 94720, USA.
F. E. Christensen
Danmarks Tekniske Universitet Space–National Space Institute, Technical University of Denmark, Elektrovej 327, 2800 Lyngby, Denmark.
W. W. Craig
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
C. J. Hailey
Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA.
G. Matt
Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy.
J. M. Miller
Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA.
P. T. O’Brien
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.
D. Stern
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
T. J. Turner
Physics Department, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.
Eureka Scientific Inc., 2452 Delmer Street Suite 100, Oakland, CA 94602, USA.
M. J. Ward
Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK.

Notes

*Corresponding author. E-mail: [email protected]

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