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Low-redshift absorption in the Seyfert galaxy PG1211+143 – a distant inflow maintaining off-plane accretion or the gravitational redshift of matter orbiting the SMBH - stae1491.pdf (277.65 kB)

Low-redshift absorption in the Seyfert galaxy PG1211+143 – a distant inflow maintaining off-plane accretion or the gravitational redshift of matter orbiting the SMBH?

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posted on 2024-07-05, 15:39 authored by Ken Pounds, Kim Page

The detection of a high-velocity (∼0.3c) inflow of highly ionized matter during an extended XMM–Newton observation of the luminous Seyfert galaxy PG1211+143 in 2014 provided the first direct evidence of a short-lived accretion event, and an explanation for the powerful winds (UFOs) now recognized as a common property of many luminous Seyfert galaxies. Although the ultra-fast inflow observed at a redshift of 0.483 was detected in only one of seven spacecraft orbits, weaker (lower column) but more persistent absorption is seen at a redshift of 0.123 in the high-exposure soft X-ray (RGS) spectra summed over all seven individual spacecraft orbits. Similar stacking of the higher energy (pn camera) spectra reveals underlying absorption at a redshift of 0.148. Interpreted, conventionally, as a Doppler redshift, the RGS observation indicates a line-of-sight inflow velocity v ∼ 0.038c and (free-fall) radial location at 1400 Rg, with the higher redshift and ionization in pn camera spectra perhaps detecting that inflow closer to the black hole. A very different explanation would be absorption in matter subject to the strong gravity close to the SMBH, an interpretation supported by the launch of a new UFO in the final spacecraft orbit.

History

Author affiliation

College of Science & Engineering Physics & Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

531

Issue

4

Pagination

4852 - 4856

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Copyright date

2024

Available date

2024-07-05

Language

en

Deposited by

Dr Kim Page

Deposit date

2024-07-01

Data Access Statement

The data underlying this article are available in the XMM archive at http://nxsa.esac.esa.int/nxsa-web.

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