Observable Properties Of Double-Barred Galaxies In N-Body Simulations

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dc.contributor.utaustinauthorShen, Juntai T.en_US
dc.creatorShen, Juntai T.en_US
dc.creatorDebattista, Victor P.en_US
dc.date.accessioned2016-04-28T19:34:21Z
dc.date.available2016-04-28T19:34:21Z
dc.date.issued2009-01en
dc.description.abstractAlthough at least one quarter of early-type barred galaxies host secondary stellar bars embedded in their large-scale primary counterparts, the dynamics of such double-barred galaxies are still not well understood. Recently we reported success at simulating such systems in a repeatable way in collisionless systems. In order to further our understanding of double-barred galaxies, here we characterize the density and kinematics of the N-body simulations of these galaxies. This will facilitate comparison with observations and lead to a better understanding of the observed double-barred galaxies. We find the shape and size of our simulated secondary bars are quite reasonable compared to the observed ones. We demonstrate that an authentic decoupled secondary bar may produce only a weak twist of the kinematic minor axis in the stellar velocity field, due to the relatively large random motion of stars in the central region. We also find that the edge-on nuclear bars are probably not related to boxy peanut-shaped bulges which are most likely to be edge-on primary large-scale bars. Another kinematic feature often present in our double-barred models is a ring-like feature in the fourth-order Gauss-Hermite moment h(4) maps. Finally, we demonstrate that the non-rigid rotation of the secondary bar causes its pattern speed to not be derived with great accuracy using the Tremaine-Weinberg method. We also compare with observations of NGC 2950, a prototypical double-barred early-type galaxy, which suggest that the nuclear bar may be rotating in the opposite sense as the primary.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipH.J.S. fellowshipen_US
dc.description.sponsorshipUniversity of Washingtonen_US
dc.description.sponsorshipNSF ITR PHY-0205413en_US
dc.identifierdoi:10.15781/T28B9D
dc.identifier.Filename2009_01_nbody.pdfen_US
dc.identifier.citationShen, Juntai, and Victor P. Debattista. "Observable Properties of Double-Barred Galaxies in N-Body Simulations." The Astrophysical Journal, Vol. 690, No. 1 (Jan., 2009): 758.en_US
dc.identifier.doi10.1088/0004-637x/690/1/758en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34778
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: kinematics and dynamicsen_US
dc.subjectgalaxies:en_US
dc.subjectstructureen_US
dc.subjectstellar dynamicsen_US
dc.subjecttremaine-weinberg methoden_US
dc.subjectcentral mass concentrationsen_US
dc.subjectvelocityen_US
dc.subjectdispersion dropsen_US
dc.subjectdark-matter halosen_US
dc.subjectpattern speeden_US
dc.subjectsecular evolutionen_US
dc.subjectspiral galaxiesen_US
dc.subjectdisk galaxiesen_US
dc.subjectelliptical galaxiesen_US
dc.subjectstellar dynamicsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleObservable Properties Of Double-Barred Galaxies In N-Body Simulationsen_US
dc.typeArticleen_US

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