Radial velocity offsets due to mass outflows and extinction in active galactic nuclei

Simple item page
dc.contributorVirginia Techen
dc.contributor.authorCrenshaw, D. M.en
dc.contributor.authorSchmitt, H. R.en
dc.contributor.authorKraemer, S. B.en
dc.contributor.authorMushotzky, R. F.en
dc.contributor.authorDunn, Jay P.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-02-05en
dc.date.accessioned2014-02-25T13:57:03Zen
dc.date.available2014-02-25T13:57:03Zen
dc.date.issued2010-01en
dc.description.abstractWe present a study of the radial velocity offsets between narrow emission lines and host galaxy lines (stellar absorption and Hi 21 cm emission) in Seyfert galaxies with observed redshifts less than 0.043. We find that 35% of the Seyferts in the sample show [O III] emission lines with blueshifts with respect to their host galaxies exceeding 50 km s(-1), whereas only 6% show redshifts this large, in qualitative agreement with most previous studies. We also find that a greater percentage of Seyfert 1 galaxies show blueshifts than Seyfert 2 galaxies. Using Hubble Spce Talescope/Space Telescope Imaging Spectrograph spatially resolved spectra of the Seyfert 2 galaxy NGC 1068 and the Seyfert 1 galaxy NGC 4151, we generate geometric models of their narrow-line regions (NLRs) and inner galactic disks, and show how these models can explain the blueshifted [O III] emission lines in collapsed STIS spectra of these two Seyferts. We conclude that the combination of mass outflow of ionized gas in the NLR and extinction by dust in the inner disk (primarily in the form of dust spirals) is primarily responsible for the velocity offsets in Seyfert galaxies. More exotic explanations are not needed. We discuss the implications of this result for the velocity offsets found in higher redshift active galactic nuclei.en
dc.description.sponsorshipNational Aeronautics and Space Administrationen
dc.identifier.citationD. M. Crenshaw et al. 2010. " Radial velocity offsets due to mass outflows and extinction in active galactic nuclei," ApJ 708 419 doi:10.1088/0004-637X/708/1/419en
dc.identifier.doihttps://doi.org/10.1088/0004-637x/708/1/419en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/10919/25540en
dc.identifier.urlhttp://iopscience.iop.org/0004-637X/708/1/419/pdf/0004-637X_708_1_419.pdfen
dc.language.isoen_USen
dc.publisherIOP Publishing Ltd.en
dc.rightsIn Copyrighten
dc.rights.holderIOP Publishing, Ltd.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgalaxies: activeen
dc.subjectgalaxies: kinematics and dynamicsen
dc.subjectgalaxies: seyferten
dc.subjectnarrow-line regionen
dc.subjectquasar sdss j092712.65+294344.0en
dc.subjectseyfert-2 galaxyen
dc.subjectngc-1068en
dc.subjectemission-lineen
dc.subjectblack-holeen
dc.subjectphysical conditionsen
dc.subjectngc 4151en
dc.subjectresolved spectroscopyen
dc.subjectdust morphologyen
dc.subjectionized-gasen
dc.titleRadial velocity offsets due to mass outflows and extinction in active galactic nucleien
dc.title.serialAstrophysical Journalen
dc.typeArticle - Refereeden

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
0004-637X_708_1_419.pdf
Size:
1.19 MB
Format:
Adobe Portable Document Format
Description:
Main article
Download

Collections

Scholarly Works, Physics