Ionization-driven Fragmentation of Gas Outflows Responsible for FeLoBALs in Quasars

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dc.contributorVirginia Techen
dc.contributor.authorBautista, M. A.en
dc.contributor.authorDunn, Jay P.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-02-28en
dc.date.accessioned2014-03-10T13:18:50Zen
dc.date.available2014-03-10T13:18:50Zen
dc.date.issued2010-07en
dc.description.abstractWe show that time variations in the UV ionizing continuum of quasars, on scales of similar to 1 yr, affect the dynamic structure of the plasmas responsible for low-ionization broad absorption lines. Variations of the ionizing continuum produce non-equilibrium photoionization conditions over a significant fraction of the absorbing clouds and supersonically moving ionization fronts. When the flux drops, the contraction of the ionized region drives a supersonic cooling front toward the radiation source and a rarefaction wave in the opposite direction. The pressure imbalance is compensated by an increased speed of the cool gas relative to the front. When the flux recovers, the cool gas is re-ionized and re-heated by a supersonic ionization front traveling away from the radiation source and a forward shock is created. The re-heated clouds equilibrate to a temperature of similar to 10(4) K and are observed to have different radial velocities than the main cloud. Such fragmentation seems consistent with the multicomponent structure of troughs seen in some objects. The velocity differences measured among various components in the quasars QSO 2359-1241 and SDSS J0318-0600 can be reproduced by our model if strong magnetic fields (similar to 10 mG) are present within the clouds.en
dc.identifier.citationManuel A. Bautista and Jay P. Dunn 2010 ApJ 717 L98 doi:10.1088/2041-8205/717/2/L98en
dc.identifier.doihttps://doi.org/10.1088/2041-8205/717/2/l98en
dc.identifier.issn2041-8205en
dc.identifier.urihttp://hdl.handle.net/10919/25846en
dc.identifier.urlhttp://iopscience.iop.org/2041-8205/717/2/L98en
dc.language.isoen_USen
dc.publisherIOP PUBLISHING LTDen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgalaxies: activeen
dc.subjecthydrodynamicsen
dc.subjectquasars: absorption linesen
dc.subjectshock wavesen
dc.subjectlarge telescope observationsen
dc.subjectmagnetic-fieldsen
dc.subjectsdss j0318-0600en
dc.subjectqsoen
dc.subject2359-1241en
dc.subjectagn outflowen
dc.subjectheat wavesen
dc.subjectamplificationen
dc.subjectTurbulenceen
dc.titleIonization-driven Fragmentation of Gas Outflows Responsible for FeLoBALs in Quasarsen
dc.title.serialAstrophysical Journal Lettersen
dc.typeArticle - Refereeden

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