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We have analyzed X-ray data of SMC X-1 obtained with \textit{Suzaku}, anddiscovered a combination of an absorption line and an underlying broadenedemission line centered at 6.4 keV in an observation performed on May 19, 2012.This absorption line is centered at $6.61_{-0.03}^{+0.02}$~keV with anabsorption strength of $5.9_{-1.4}^{+1.7}$, naturally interpreted as anHe$_{\alpha}$ resonance line of Fe at 6.7~keV that has a redshift of$4000_{-1300}^{+1400}\;\mathrm{km\;s^{-1}}$. Although \textit{Suzaku} observedthis system ten times during 11 months in 2011--2012, the absorption featurehas been seen only in a single observation when the NS was in a rising phase ofthe super-orbital modulation, which can be regarded as an egress fromoccultation by an extended accretion disk. We therefore attribute the line to alow density, highly ionized absorber in an accretion disk corona arising fromthe disk illuminated by the NS's intense X-rays. This interpretation alsoagrees with a discussion on the photoionization degree and the line depth.

Discovery of Red-shifted He-like Iron Absorption Line from Luminous Accreting Neutron Star SMC X-1