dc.contributor.author | Fang, Taotao | |
dc.contributor.author | Mckee, Christopher F. | |
dc.contributor.author | Canizares, Claude R. | |
dc.contributor.author | Wolfire, Mark | |
dc.date.accessioned | 2012-09-25T13:35:58Z | |
dc.date.available | 2012-09-25T13:35:58Z | |
dc.date.issued | 2006-06 | |
dc.date.submitted | 2005-04 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.issn | 1538-4357 | |
dc.identifier.uri | http://hdl.handle.net/1721.1/73156 | |
dc.description.abstract | Recent 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.iso | en_US | |
dc.publisher | IOP Publishing | en_US |
dc.relation.isversionof | http://dx.doi.org/ 10.1086/500310 | en_US |
dc.rights | Article 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.source | arVix | en_US |
dc.title | A Galactic Origin for the Local Ionized X-ray Absorbers | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Fang, 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.department | Massachusetts Institute of Technology. Department of Physics | en_US |
dc.contributor.mitauthor | Canizares, Claude R. | |
dc.relation.journal | Astrophysical Journal | en_US |
dc.eprint.version | Author's final manuscript | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dspace.orderedauthors | Fang, Taotao; Mckee, Christopher F.; Canizares, Claude R.; Wolfire, Mark | en |
dc.identifier.orcid | https://orcid.org/0000-0002-5769-8441 | |
mit.license | PUBLISHER_POLICY | en_US |