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The detection of a high velocity (~ 0.3c) inflow of highly ionized matterduring an extended XMM-Newton observation of the luminous Seyfert galaxy PG1211+143 in 2014 provided the first direct evidence of a short-lived accretionevent, and an explanation for the powerful winds (UFOs) now recognised as acommon property of many luminous Seyfert galaxies. Although the ultra-fastinflow - observed at a redshift of 0.483 - was detected in only one of sevenspacecraft orbits, weaker (lower column) but more persistent absorption is seen- at a redshift of 0.123 - in the high exposure, soft X-ray (RGS) spectrasummed over all 7 individual spacecraft orbits. Similar stacking of the higherenergy (pn camera) spectra reveals underlying absorption at a redshift of0.148. Interpreted, conventionally, as a Doppler redshift, the RGS observationindicates a line-of-sight inflow velocity v ~ 0.038c and (free-fall) radiallocation at 1400 R_g, with the higher redshift and ionization in pn cameraspectra perhaps detecting that inflow closer to the black hole. A verydifferent explanation would be absorption in matter subject to the stronggravity close to the SMBH, an interpretation supported by the launch of a newUFO in the final spacecraft orbit.

Low-redshift absorption in the Seyfert galaxy PG 1211+143 -- a distant  inflow maintaining off-plane accretion or the gravitational redshift of  matter orbiting the SMBH?