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We present a high resolution X-ray spectrum of the iron K bandpass inMCG-6-30-15 based on a 522 ksec observation with Chandra's High EnergyTransmission Grating Spectrometer. The Chandra spectrum is consistent with thepresence of a relativistically broadened, highly redshifted iron K alphaemission line with a similar profile to previous observations. A number ofnarrow features are detected above 2 keV, including a narrow Fe K alphaemission line and narrow absorption lines from H- and He-like Fe, H-like S andH-like Si. This absorption is well described by a photoionized plasma with acolumn 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 dispersionparameter b = 100 km/s. Applying this absorption model to a high fidelityXMM-Newton EPIC-pn spectrum we find that a broad iron line is still requiredwith emission extending to within 1.9 gravitational radii of the black hole. Ifthe iron line comes from an accretion disk truncated at the innermost stablecircular orbit, this indicates that the black hole must be spinning rapidlywith a>0.95. Ionized absorption models attempting to explain the 3-6 keVspectral curvature without strong gravity predict absorption lines in the6.4-6.6 keV range that are inconsistent with the Chandra spectrum. The H- andHe-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 ahigh velocity, high ionization component of the warm absorber outflow. Thishigh ionization component may dominate the energy budget of the outflow, andaccount for a significant fraction of the outflowing mass. (Abstracttruncated).Comment: Accepted for publication in The Astrophysical Journa

AChandraHETGS Spectral Study of the Iron K Bandpass in MCG −6‐30‐15: A Narrow View of the Broad Iron Line