Please use this identifier to cite or link to this item:
Title: On why the iron K-shell absorption in AGN is not a signature of the local warm/hot intergalactic medium
Authors: Reeves, J. N.
Done, C.
others, KAPA5
Pounds, Kenneth Alwyne
Terashima, Y.
Hayashida, K.
Anabuki, N.
Uchino, M.
Turner, Martin
First Published: 1-Mar-2008
Publisher: Wiley-Blackwell
Citation: Monthly Notices of the Royal Astronomical Society Letters, 2008, 385, pp. L108-112
Abstract: We present a comparison between the 2001 XMM–Newton and 2005 Suzaku observations of the quasar, PG 1211+143, at z = 0.0809. Variability is observed in the 7 keV iron K-shell absorption line (at 7.6 keV in the quasar frame), which is significantly weaker in 2005 than during the 2001 XMM–Newton observation. From a recombination time-scale of <4 yr, this implies an absorber density n > 4 × 10[Superscript: 3] cm[Superscript: −3], while the absorber column is 5 × 10[Superscript: 22] < NH < 1 × 10[Superscript: 24] cm[Superscript: −2]. Thus, the size scale of the absorber is too compact (pc scale) and the surface brightness of the dense gas too high (by 9–10 orders of magnitude) to arise from local hot gas, such as the local bubble, group or warm/hot intergalactic medium (WHIM), as suggested by McKernan, Yaqoob & Reynolds. Instead, the iron K-shell absorption must be associated with an active galactic nucleus (AGN) outflow with mildly relativistic velocities. Finally, we show that the association of the absorption in PG 1211+143 with local hot gas is simply a coincidence, and the comparison between the recession and iron K absorber outflow velocities in other AGN does not reveal a one-to-one kinematic correlation.
DOI Link: 10.1111/j.1745-3933.2008.00443.x
ISSN: 1745-3933
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2008 The Authors Monthly Notices of the Royal Astronomical Society Letters © 2008 RAS. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2008 The Authors. Published by Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

Files in This Item:
File Description SizeFormat 
MNRAS-2008-Reeves-L108-12.pdfPublished (publisher PDF)164.17 kBAdobe PDFView/Open

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