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dc.contributor.authorFang, Taotao
dc.contributor.authorMckee, Christopher F.
dc.contributor.authorCanizares, Claude R.
dc.contributor.authorWolfire, Mark
dc.date.accessioned2012-09-25T13:35:58Z
dc.date.available2012-09-25T13:35:58Z
dc.date.issued2006-06
dc.date.submitted2005-04
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/1721.1/73156
dc.description.abstractRecent Chandra and XMM-Newton observations of distant quasars have shown strong local (z ~ 0) X-ray absorption lines from highly ionized gas, primarily He-like oxygen. The nature of these X-ray absorbers, i.e., whether they are part of the hot gas associated with the Milky Way or part of the intragroup medium in the Local Group, remains a puzzle due to the uncertainties in the distance. We present in this paper a survey of 20 AGNs with Chandra and XMM-Newton archival data. About 40% of the targets show local O VII He α absorption with column densities around 10[superscript 16] cm[superscript -2]; in particular, O VII absorption is present in all the high-quality spectra. We estimate that the sky covering fraction of this O VII-absorbing gas is at least 63%, at 90% confidence, and likely to be unity given enough high-quality spectra. On the basis of (1) the expected number of absorbers along sight lines toward distant AGNs, (2) joint analysis with X-ray emission measurements, and (3) mass estimation, we argue that the observed X-ray absorbers are part of the hot gas associated with our Galaxy. Future observations will significantly improve our understanding of the covering fraction and provide robust tests of this result.en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/ 10.1086/500310en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourcearVixen_US
dc.titleA Galactic Origin for the Local Ionized X-ray Absorbersen_US
dc.typeArticleen_US
dc.identifier.citationFang, Taotao et al. “A Galactic Origin for the Local Ionized X‐Ray Absorbers.” The Astrophysical Journal 644.1 (2006): 174-179.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.mitauthorCanizares, Claude R.
dc.relation.journalAstrophysical Journalen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsFang, Taotao; Mckee, Christopher F.; Canizares, Claude R.; Wolfire, Marken
dc.identifier.orcidhttps://orcid.org/0000-0002-5769-8441
mit.licensePUBLISHER_POLICYen_US


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