Confirmation of a Near-relativistic Wind in the z=3.91 Quasar APM 08279+5255.

Details Confirmation of a Near-relativistic Wind in the z=3.91 Quasar APM 08279+5255. Confirmation of a Near-relativistic Wind in the z=3.91 Quasar APM 08279+5255.

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541130c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #411.30; Bulletin of the American Astronomical Society, Vol. 42, p.245

Astronomy and Astrophysics

Astronomy

Scientific paper

We present recent X-ray observations of the z = 3.91 quasar APM 08279+5255 that confirm the presence of near-relativistic outflows of ionized absorbing material with velocities of up to 0.76c in this object. The maximum outflow velocity constrains the angle between the wind velocity and our line of sight to be less than 22 degrees. The X-ray broad absorption lines (BALs) and 0.2-10 keV continuum of APM 08279+5255 show significant variability on timescales as short as 3.3 days (proper time) implying a source size-scale r_g, where r_g is the gravitational radius. Based on our spectral analysis we identify the following components of the outflow:
(a) Highly ionized X-ray absorbing material with an ionization parameter in the range of 2.9 < log xi < 3.9 and a column density of log N_H 23 outflowing at velocities of up to 0.76 c.
(b) Low-ionization X-ray absorbing gas with log N_H 22.8. We find a possible trend between the X-ray photon index and the maximum outflow velocity of the ionized absorber in the sense that flatter spectra appear to result in lower outflow velocities. Our studies indicate that these quasar winds may be important in regulating the growth of the supermassive black hole, controlling the formation of the host galaxy, and enriching the intergalactic medium.
We acknowledge financial support from NASA via the Smithsonian Institution grant SAO SV4-74018 and from NNX08AB71G. WNB acknowledges financial support from NASA LTSA grant NAG5-13035.

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