Show simple item record

dc.creatorMeidt, S. E.en_US
dc.creatorRand, Richard J.en_US
dc.creatorMerrifield, M. R.en_US
dc.creatorDebattista, Victor P.en_US
dc.creatorShen, Juntai T.en_US
dc.date.accessioned2016-04-28T19:42:21Z
dc.date.available2016-04-28T19:42:21Z
dc.date.issued2008-04en
dc.identifierdoi:10.15781/T2W818
dc.identifier.citationMeidt, Sharon E., Richard J. Rand, Michael R. Merrifield, Victor P. Debattista, and Juntai Shen. "Tests of the Radial Tremaine-Weinberg Method." The Astrophysical Journal, Vol. 676, No. 2 (Apr., 2008): 899.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35137
dc.description.abstractAt the intersection of galactic dynamics, evolution, and global structure, issues such as the relation between bars and spirals and the persistence of spiral patterns can be addressed through the characterization of the angular speeds of the patterns and their possible radial variation. The radial Tremaine-Weinberg (TWR) method, a generalized version of the Tremaine-Weinberg method for observationally determining a single, constant pattern speed, allows the pattern speed to vary arbitrarily with radius. Here we perform tests of the TWR method with regularization on several simulated galaxy data sets. The regularization is employed as a means of smoothing intrinsically noisy solutions, as well as for testing model solutions of different radial dependence (e. g., constant, linear, or quadratic). We test these facilities in studies of individual simulations and demonstrate successful measurement of both bar and spiral pattern speeds in a single disk, secondary bar pattern speeds, and spiral winding (in the first application of a TW calculation to a spiral simulation). We also explore the major sources of error in the calculation and find uncertainty in the major-axis position angle most dominant. In all cases, the method is able to extract pattern speed solutions where discernible patterns exist to within 20% of the known values, suggesting that the TWR method should be a valuable tool in the area of galactic dynamics. For utility, we also discuss the caveats in, and compile a prescription for, applications to real galaxies.en_US
dc.description.sponsorshipNASAen_US
dc.description.sponsorshipNSF AST 03-06958en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_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.subjectgalaxies : kinematics and dynamicsen_US
dc.subjectgalaxies : spiralen_US
dc.subjectgalaxies :en_US
dc.subjectstructureen_US
dc.subjectmethods : numericalen_US
dc.subjectmultiple pattern speedsen_US
dc.subjectbarred galaxiesen_US
dc.subjectdynamical frictionen_US
dc.subjectgranden_US
dc.subjectdesignen_US
dc.subjectspiral modesen_US
dc.subjectdark-matteren_US
dc.subjectconstraintsen_US
dc.subjectkinematicsen_US
dc.subjectngc-2950en_US
dc.subjectngc-6946en_US
dc.subjectastronomy & astrophysicsen_US
dc.titleTests Of The Radial Tremaine-Weinberg Methoden_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2008_04_testsradial.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1086/527530en_US
dc.contributor.utaustinauthorShen, Juntai T.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record