Please use this identifier to cite or link to this item:
Title: The Variable Fast Soft X-Ray Wind in PG 1211+143
Authors: Reeves, J. N.
Lobban, A.
Pounds, Kenneth A.
First Published: 8-Feb-2018
Publisher: American Astronomical Society
Citation: The Astrophysical Journal, 2018, 854 (1)
Abstract: The analysis of a series of seven observations of the nearby (z = 0.0809) QSO PG 1211+143, taken with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton in 2014, are presented. The high-resolution soft X-ray spectrum, with a total exposure exceeding 600 ks, shows a series of blueshifted absorption lines from the He and H-like transitions of N, O, and Ne, as well as from L-shell Fe. The strongest absorption lines are all systematically blueshifted by −0.06c, originating in two absorption zones from low- and high-ionization gas. Both zones are variable on timescales of days, with the variations in absorber opacity effectively explained by either column density changes or the absorber ionization responding directly to the continuum flux. We find that the soft X-ray absorbers probably exist in a two-phase wind at a radial distance of ∼1017–1018 cm from the black hole with the lower-ionization gas as denser clumps embedded within a higher-ionization outflow. The overall mass outflow rate of the soft X-ray wind may be as high as 2M yr−1 , close to the Eddington rate for PG 1211+143 and similar to that previously deduced from the Fe K absorption.
DOI Link: 10.3847/1538-4357/aaa776
ISSN: 0004-637X
eISSN: 1538-4357
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2018, American Astronomical Society. Published by IOP Publishing. Deposited with reference to the publisher’s open access archiving policy. (
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

Files in This Item:
File Description SizeFormat 
Reeves_2018_ApJ_854_28.pdfPublished (publisher PDF)2.59 MBAdobe PDFView/Open

Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.