  We present a high resolution X-ray spectrum of the iron K bandpass in
MCG-6-30-15 based on a 522 ksec observation with Chandra's High Energy
Transmission Grating Spectrometer. The Chandra spectrum is consistent with the
presence of a relativistically broadened, highly redshifted iron K alpha
emission line with a similar profile to previous observations. A number of
narrow features are detected above 2 keV, including a narrow Fe K alpha
emission line and narrow absorption lines from H- and He-like Fe, H-like S and
H-like Si. This absorption is well described by a photoionized plasma with a
column density log N_H = 23.2 and an ionization parameter log xi = 3.6,
assuming the iron abundance has the Solar value and a velocity dispersion
parameter b = 100 km/s. Applying this absorption model to a high fidelity
XMM-Newton EPIC-pn spectrum we find that a broad iron line is still required
with emission extending to within 1.9 gravitational radii of the black hole. If
the iron line comes from an accretion disk truncated at the innermost stable
circular orbit, this indicates that the black hole must be spinning rapidly
with a>0.95. Ionized absorption models attempting to explain the 3-6 keV
spectral curvature without strong gravity predict absorption lines in the
6.4-6.6 keV range that are inconsistent with the Chandra spectrum. The H- and
He-like iron absorption lines in the Chandra spectrum are blueshifted by 2.0
(+0.7/-0.9) x 10^3 km/s compared to the source frame, and may originate in a
high velocity, high ionization component of the warm absorber outflow. This
high ionization component may dominate the energy budget of the outflow, and
account for a significant fraction of the outflowing mass. (Abstract
truncated).
