We use cookies to ensure that we give you the best experience on our website. You can change your cookie settings at any time. Otherwise, we'll assume you're OK to continue.

Department of Physics

Staff profile

Publication details for Prof Martin Ward

Reeves, J. N., O'Brien, P. T. & Ward, M. J. (2003). A massive x-ray outflow from the quasar PDS 456. Astrophysical Journal: Letters 593(2): L65-L68.

Author(s) from Durham


We report on XMM-Newton spectroscopic observations of the luminous radio-quiet quasar PDS 456. The hard X-ray spectrum of PDS 456 shows a deep absorption trough (constituting 50% of the continuum) at energies above 7 keV in the quasar rest frame, which can be attributed to a series of blueshifted K-shell absorption edges due to highly ionized iron. The higher resolution soft X-ray Reflection Grating Spectrometer spectrum exhibits a broad absorption line feature near 1 keV, which can be modeled by a blend of L-shell transitions from highly ionized iron (Fe XVIIFe XXIV). An extreme outflow velocity of 50,000 km s-1 is required to model the K- and L-shell iron absorption present in the XMM-Newton data. Overall, a large column density (NH = 5 × 1023 cm-2) of highly ionized gas (log = 2.5) is required in PDS 456. A high-mass outflow rate of 10 M yr-1 (assuming a conservative outflow covering factor of 0.1 sr) is derived, which is of the same order as the overall mass accretion rate in PDS 456. The kinetic energy of the outflow represents a substantial fraction (10%) of the quasar energy budget, while the large column and outflow velocity place PDS 456 toward the extreme end of the broad absorption line quasar population.


Boller, Th., Tanaka, Y., Fabian, A. C., Brandt, W. N., Gallo, L., Anabuki, N.,
Haba, Y., & Vaughan, S. 2003, MNRAS, in press (astro-ph/0305239)
Boller, Th., et al. 2002, MNRAS, 329, L1
Bottorff, M. C., Korista, K. T., Shlosman, I., & Blandford, R. D. 1997, ApJ,
479, 200
Chartas, G., Brandt, W. N., & Gallagher, S. C. 2003, ApJ, in press (astro-ph/
Chartas, G., Brandt, W. N., Gallagher, S. C., & Garmire, G. P. 2002, ApJ,
579, 169
Dickey, J. M., & Lockman, F. J. 1990, ARA&A, 28, 215
Hasinger, G., Schartel, N., & Komossa, S. 2002, ApJ, 573, L77
Kallman, T., Liedahl, D., Osterheld, A., Goldstein, W., & Kahn, S. 1996, ApJ,
465, 994
King, A., & Pounds, K. A. 2003, MNRAS, in press (astro-ph/0305541)
Laor, A. 1991, ApJ, 376, L90
Lee, J., Reynolds, C. S., Remillard, R., Schultz, N., Blackman, E. G., & Fabian,
A. C. 2002, ApJ, 567, 1102
Murray, N., Chiang, J., Grossman, S. A., & Voit, G. M. 1995, ApJ, 451, 498
Parmar, A., Oosterbroek, T., Boirin, L., & Lumb, D. 2002, A&A, 386, 910
Pounds, K. A., King, A., Page, K., & O’Brien, P. T. 2003a, MNRAS, submitted
Pounds, K. A., Reeves, J. N., King, A., Page, K., & O’Brien, P. T. 2003b,
MNRAS, in press (astro-ph/0303603)
Proga, D., Stone, J. M., & Kallman, T. 2000, ApJ, 543, 686
Reeves, J. N., O’Brien, P. T., Vaughan, S., Law-Green, D.,Ward, M., Simpson,
C., Pounds, K. A., & Edelson, R. 2000, MNRAS, 312, L17
Reeves, J. N., Wynn, G., O’Brien, P. T., & Pounds, K. A. 2002, MNRAS,
336, L56
Sidoli, L., Parmar, A., Oosterbroek, T., & Lumb, D. 2002, A&A, 385, 940
Simpson, C., Ward, M., O’Brien, P. T., & Reeves, J. N. 1999, MNRAS, 303,
Stru¨der, L., et al. 2001, A&A, 365, L18
Thorne, K. S. 1974, ApJ, 191, 507
Torres, C. A. O., et al. 1997, ApJ, 488, L19
Turner, M. J. L., et al. 2001, A&A, 365, L27
Turnshek, D. A., Grillmair, C. J., Foltz, C. B., & Weymann, R. J. 1988, ApJ,
325, 651
Voges, W., et al. 1999, A&A, 349, 389
Weymann, R. J., Morris, S. L., Foltz, C. B., & Hewett, P. C. 1991, ApJ, 373,


© 2003 by The American Astronomical Society.