  The EPIC data of MCG -6-30-15 observed by XMM-Newton were analyzed for the
complexities of the iron K-alpha line. Here we report that the additional line
component (ALC) at 6.9 keV undoubtedly appears within the broad iron Kalpha;
line profile at the high state, whereas it disappears at the low state. These
state-dependent behaviors exclude several possible origins and suggest an
origin of the ALC in matter being ejected from the vicinity of the black hole.
At the low state, the newborn blob ejected from the accretion disk is so
Thomson-thick that hard X-rays are blocked from ionizing the old blobs, leading
to the disappearance of the ALC. When the blob becomes Thomson-thin as a result
of expansion, the hard X-ray will penetrate it and ionize the old ones,
emitting the ALC at the high state. The blob ejection is the key to switching
the ALC on or off.
