BAL outflow contribution to AGN feedback: frequency of S IV outflows in the SDSS

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dc.contributorVirginia Techen
dc.contributor.authorDunn, Jay P.en
dc.contributor.authorArav, Nahumen
dc.contributor.authorAoki, Kentaroen
dc.contributor.authorWilkins, Ashleeen
dc.contributor.authorLaughlin, Courtneyen
dc.contributor.authorEdmonds, Douglasen
dc.contributor.authorBautista, Manuelen
dc.contributor.departmentPhysicsen
dc.date.accessed2014-02-05en
dc.date.accessioned2014-02-25T13:57:03Zen
dc.date.available2014-02-25T13:57:03Zen
dc.date.issued2012-05en
dc.description.abstractWe present a study of broad absorption line (BAL) quasar outflows that show S IV lambda 1063 and S IV* lambda 1073 troughs. The fractional abundances of S IV and C IV peak at similar value of the ionization parameter, implying that they arise from the same physical component of the outflow. Detection of the S IV* troughs will allow us to determine the distance to this gas with higher resolution and higher signal-to-noise spectra, therefore providing the distance and energetics of the ubiquitous C IV BAL outflows. In our bright sample of 156 SDSS quasars, 14% show C IV and 1.9% S IV troughs, which are consistent with a fainter magnitude sample with twice as many objects. One object in the fainter sample shows evidence of a broad S IV trough without any significant trough present from the excited state line, which implies that this outflow could be at a distance of several kpc. Given the fractions of C IV and S IV, we establish firm limits on the global covering factor on S IV that ranges from 2.8% to 21% (allowing for the k-correction). Comparison of the expected optical depth for these ions with their detected percentage suggests that these species arise from common outflows with a covering factor closer to the latter.en
dc.description.sponsorshipNSF AST 0837880en
dc.description.sponsorshipNASA LTSA NAG5-12867en
dc.identifier.citationJay P. Dunn et al. 2012. "BAL outflow contribution to AGN feedback: frequency of S IV outflows in the SDSS," ApJ 750 143 doi:10.1088/0004-637X/750/2/143en
dc.identifier.doihttps://doi.org/10.1088/0004-637x/750/2/143en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/10919/25542en
dc.identifier.urlhttp://iopscience.iop.org/0004-637X/750/2/143/pdf/0004-637X_750_2_143.pdfen
dc.language.isoen_USen
dc.publisherIOP Publishing Ltd.en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectquasars: absorption linesen
dc.subjectbroad absorption-lineen
dc.subjectdigital sky surveyen
dc.subjectlarge telescope observationsen
dc.subjecthubble-space-telescopeen
dc.subjectquasi-stellar objectsen
dc.subjectlyman-alpha foresten
dc.subjectintrinsic absorptionen
dc.subjectphysical conditionsen
dc.subjectactive galaxiesen
dc.subjectqsoen
dc.subject2359-1241en
dc.titleBAL outflow contribution to AGN feedback: frequency of S IV outflows in the SDSSen
dc.title.serialAstrophysical Journalen
dc.typeArticle - Refereeden

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