The Additional Line Component within the Iron Kα Profile in MCG −6‐30‐15: Evidence for Blob Ejection?

The EPIC data of MCG -6-30-15 observed by XMM-Newton were analyzed for thecomplexities of the iron K-alpha line. Here we report that the additional linecomponent (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. Thesestate-dependent behaviors exclude several possible origins and suggest anorigin 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 soThomson-thick that hard X-rays are blocked from ionizing the old blobs, leadingto the disappearance of the ALC. When the blob becomes Thomson-thin as a resultof 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 switchingthe ALC on or off.Comment: 6 pages, 4 Figure