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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Chandra view of the warm-hot intergalactic medium toward 1ES 1553+113: Absorption-line detections and identifications. I.
Astrophysical Journal, Volume 769, No. 2, Article 90, Year 2013
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Description
We present the first results from our pilot 500 ks Chandra Low Energy Transmission Grating Large Program observation of the soft X-ray brightest source in the z ≳ 0.4 sky, the blazar 1ES 1553+113, aimed to secure the first uncontroversial detections of the missing baryons in the X-rays. We identify a total of 11 possible absorption lines, with single-line statistical significances between 2.2σ and 4.1σ. Six of these lines are detected at high single-line statistical significance (3.6 ≤ σ ≤ 4.1), while the remaining five are regarded as marginal detections in association with either other X-ray lines detected at higher significance and/or far-ultraviolet (FUV) signposts. Three of these lines are consistent with metal absorption at z ≃ 0, and we identify them with Galactic O I and C II. The remaining eight lines may be imprinted by intervening absorbers and are all consistent with being high-ionization counterparts of FUV H I and/or O VI intergalactic medium signposts. In particular, five of these eight possible intervening absorption lines (single-line statistical significances of 4.1σ, 4.1σ, 3.9σ, 3.8σ, and 2.7σ), are identified as C V and C VI Kα absorbers belonging to three WHIM systems at zX = 0.312, z X = 0.237, and 〈zX 〉 = 0.133, which also produce broad H I (and O VI for the zX = 0.312 system) absorption in the FUV. For two of these systems (zX = 0.312 and 0.237), the Chandra X-ray data led the a posteriori discovery of physically consistent broad H I associations in the FUV (for the third system the opposite applies), so confirming the power of the X-ray-FUV synergy for WHIM studies. The true statistical significances of these three X-ray absorption systems, after properly accounting for the number of redshift trials, are 5.8σ (z X = 0.312; 6.3σ if the low-significance O V and C V Kβ associations are considered), 3.9σ (zX = 0.237), and 3.8σ (〈zX 〉 = 0.133), respectively. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Elvis, Martin S.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Krongold, Yair
Mexico, Mexico
Universidad Nacional Autónoma de México
Mathur, Smita
United States, Columbus
The Ohio State University
Danforth, Charles W.
United States, Boulder
Planetary Solutions, Inc.
Barcons, X.
Spain, Santander
Csic-uc - Instituto de Física de Cantabria Ifca
Borgani, Stefano
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Branchini, Enzo
Italy, Rome
Università Degli Studi Roma Tre
Cen, Renyue
United States, Princeton
Princeton University Observatory
Dav́e, Romeel
United States, Tucson
The University of Arizona
Kaastra, Jelle S.
Netherlands, Utrecht
Sron Netherlands Institute for Space Research
Piro, Luigi
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Shull, J. Michael
United States, Boulder
Planetary Solutions, Inc.
Zappacosta, Luca
Italy, Monte Porzio Catone
Osservatorio Astronomico Di Roma
Statistics
Citations: 38
Authors: 13
Affiliations: 13
Identifiers
Doi:
10.1088/0004-637X/769/2/90
ISSN:
0004637X