Central Rotations of Milky Way Globular Clusters

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dc.contributor.utaustinauthorNoyola, Evaen_US
dc.creatorFabricius, Maximilian H.en_US
dc.creatorNoyola, Evaen_US
dc.creatorRukdee, Surangkhanaen_US
dc.creatorSaglia, Roberto P.en_US
dc.creatorBender, Ralfen_US
dc.creatorHopp, Ulrichen_US
dc.creatorThomas, Jensen_US
dc.creatorOpitsch, Michaelen_US
dc.creatorWilliams, Michael J.en_US
dc.date.accessioned2016-10-28T19:36:57Z
dc.date.available2016-10-28T19:36:57Z
dc.date.issued2014-06en_US
dc.description.abstractMost Milky Way globular clusters (GCs) exhibit measurable flattening, even if on a very low level. Both cluster rotation and tidal fields are thought to cause this flattening. Nevertheless, rotation has only been confirmed in a handful of GCs, based mostly on individual radial velocities at large radii. We are conducting a survey of the central kinematics of Galactic GCs using the new Integral Field Unit instrument VIRUS-W. We detect rotation in all 11 GCs that we have observed so far, rendering it likely that a large majority of the Milky Way GCs rotate. We use published catalogs of GCs to derive central ellipticities and position angles. We show that in all cases where the central ellipticity permits an accurate measurement of the position angle, those angles are in excellent agreement with the kinematic position angles that we derive from the VIRUS-W velocity fields. We find an unexpected tight correlation between central rotation and outer ellipticity, indicating that rotation drives flattening for the objects in our sample. We also find a tight correlation between central rotation and published values for the central velocity dispersion, most likely due to rotation impacting the old dispersion measurements.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipNASA NAS5-26555en_US
dc.description.sponsorshipNASA Office of Space Science NNX13AC07Gen_US
dc.identifierdoi:10.15781/T2B853M3K
dc.identifier.citationFabricius, Maximilian H., Eva Noyola, Surangkhana Rukdee, Roberto P. Saglia, Ralf Bender, Ulrich Hopp, Jens Thomas, Michael Opitsch, and Michael J. Williams. "Central rotations of Milky Way globular clusters." The Astrophysical Journal Letters, Vol. 787, No. 2 (Jun., 2014): L26.en_US
dc.identifier.doi10.1088/2041-8205/787/2/l26en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43042
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_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.subjectglobular clusters: generalen_US
dc.subjectstars: kinematics and dynamicsen_US
dc.subjecttechniques:en_US
dc.subjectimaging spectroscopyen_US
dc.subjectsurface-brightness profilesen_US
dc.subjectstarsen_US
dc.subjectcatalogen_US
dc.subjectmodelsen_US
dc.subjectfieldsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleCentral Rotations of Milky Way Globular Clustersen_US
dc.typeArticleen_US

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