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Evidence for Gravitational Infall of Matter onto the Super-Massive Black Hole in the quasar PG 1211+143? | | J.N. Reeves
; K. Pounds
; P. Uttley
; S. Kraemer
; R Mushotzky
; T. Yaqoob
; I.M. George
; T.J. Turner
; | | Date: |
12 Sep 2005 | | Subject: | astro-ph | | Affiliation: | JHU/NASA/GSFC), K. Pounds (U of Leicester), P. Uttley (NASA/GSFC), S. Kraemer (NASA/GSFC/Catholic U), R Mushotzky (NASA/GSFC), T. Yaqoob (JHU/NASA/GSFC), I.M. George (UMBC/NASA/GSFC), T.J. Turner (UMBC/NASA/GSFC | | Abstract: | We report the detection of redshifted iron K-alpha absorption lines in the Chandra LETG spectrum of the narrow-line quasar, PG 1211+143. The absorption lines are observed at 4.22 keV and 4.93 keV in the quasar spectrum, corresponding to 4.56 keV and 5.33 keV in the rest frame of PG 1211+143. From Monte Carlo simulations, the chance probability of both lines being false detections is low at 1.36e-04. Highly redshifted ionized iron K-alpha (Fe XXV or Fe XXVI) is the most plausible identification for the lines at their observed energies. If identified with H-like iron K-alpha at 6.97 keV, then the relativistic velocity shifts required are 0.40c and 0.26c. The extreme velocities can be explained by pure gravitational redshift if the matter exists in a stable orbit within 6 gravitational radii of the black hole. This would require a Kerr metric for the black hole. Alternatively the absorption may be the result of matter infalling directly onto the black hole, with a maximum observed velocity of 0.38c at 6Rg in the Schwarzschild metric. This matter may originate in a failed outflow or jet, which does not escape the gravitational potential of the black hole. | | Source: | arXiv, astro-ph/0509280 | | Services: | Forum | Review | PDF | Favorites | |
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