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dc.contributorVirginia Techen
dc.contributor.authorCrenshaw, D. M.en
dc.contributor.authorKraemer, S. B.en
dc.contributor.authorSchmitt, H. R.en
dc.contributor.authorKaastra, J. S.en
dc.contributor.authorArav, Nahumen
dc.contributor.authorGabel, J. R.en
dc.contributor.authorKorista, K. T.en
dc.date.accessioned2014-03-10T13:18:51Zen
dc.date.available2014-03-10T13:18:51Zen
dc.date.issued2009-06en
dc.identifier.citationD. M. Crenshaw et al. 2009 ApJ 698 281 doi:10.1088/0004-637X/698/1/281en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/10919/25850en
dc.description.abstractWe present a study of the intrinsic UV absorption and emission lines in an historically low-state spectrum of the Seyfert 1 galaxy NGC 5548, which we obtained in 2004 February at high spatial and spectral resolution with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We isolate a component of emission with a width of 680 km s(-1) that arises from an "intermediate-line region" (ILR), similar to that we discovered in NGC 4151, at a distance of similar to 1 pc from the central continuum source. From a detailed analysis of the five intrinsic absorption components in NGC 5548 and their behavior over a span of eight years, we present evidence that most of the UV absorbers only partially cover the ILR and do not cover an extended region of UV continuum emission, most likely from hot stars in the circumnuclear region. We also find that four of the UV absorbers are at much greater distances (greater than 70 pc) than the ILR, and none have sufficient N V or C IV column densities to be the ILR in absorption. At least a portion of the UV absorption component 3, at a radial velocity of -530 km s(-1), is likely responsible for most of the X-ray absorption, at a distance less than 7 pc from the central source. The fact that we see the ILR in absorption in NGC 4151 and not in NGC 5548 suggests that the ILR is located at a relatively large polar angle (similar to 45 degrees) with respect to the narrow-line region outflow axis.en
dc.description.sponsorshipNASA NAS 5-26555en
dc.description.sponsorshipNWO, Netherlands Organization for Scientific Researchen
dc.language.isoen_USen
dc.publisherIOP PUBLISHING LTDen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgalaxies: individual (ngc 5548)en
dc.subjectgalaxies: seyferten
dc.subjectnarrow-line regionen
dc.subjectactive galactic nucleien
dc.subjectultraviolet-spectroscopic-exploreren
dc.subjectintrinsic absorption-linesen
dc.subjecthubble-space-telescopeen
dc.subjectx-rayen
dc.subjectphysical conditionsen
dc.subjectimagingen
dc.subjectspectrographen
dc.subjectwarm absorbersen
dc.subjectcolumn densityen
dc.titleMass Outflow in the Seyfert 1 Galaxy NGC 5548en
dc.typeArticle - Refereeden
dc.contributor.departmentPhysicsen
dc.identifier.urlhttp://iopscience.iop.org/0004-637X/698/1/281en
dc.date.accessed2014-02-28en
dc.title.serialAstrophysical Journalen
dc.identifier.doihttps://doi.org/10.1088/0004-637x/698/1/281en


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